Fiber otp model fiber optic temperature sensor

Teplotní senzor s optickými vlákny, Inteligentní monitorovací systém, Výrobce distribuovaných optických vláken v Číně

The working principle of Fiber OTP type fiber temperature sensor
Fiber optic temperature sensor is a technology that uses fiber optic as a sensing element to measure temperature by measuring the optical properties of the fiber optic as a function of temperature. Here is a specific introduction:

1、 Principle based on changes in optical properties

Principle of amplitude variation
In a component-based fiber optic temperature sensor, the diameter and refractive index of the fiber core will change with temperature. For example, when the temperature changes, the environment of the fiber core changes, causing the light to propagate unevenly and disperse, resulting in a change in the amplitude of the light. This sensor, which utilizes the amplitude of light vibration to vary with temperature, works based on this principle. Some fiber optic temperature sensors may use specially designed fiber optic structures. When the temperature fluctuates within the normal range, the propagation path of internal light changes slightly, thereby changing the amplitude of the light. External detection equipment can capture this amplitude change and convert it into a change in temperature value.
Phase change principle
The length, refractive index, and core diameter of single-mode optical fibers all vary with temperature. For example, interferometers can be used to detect the phase changes of light propagating in optical fibers. Like the Mahzard interferometer, the light from the signal fiber is mixed with a stable reference beam. Due to the influence of temperature and other measurement parameters on the signal fiber, the phase of the propagating optical signal changes, causing interference between the two light columns. A suitable phase detector can be used to detect small phase changes, while a stripe counter can detect large changes. The phase change caused by this interference reflects the temperature change, and accurate measurement of phase change helps to measure temperature with high precision.
Principle of polarization state change
The polarization plane of a single-mode fiber rotates with temperature, and the amplitude change is obtained through a polarizer. In some high-precision applications, this fiber optic temperature sensor based on polarization state changes can be effective. When temperature acts on an optical fiber, its internal optical structure will cause a regular change in the polarization state of light, and this change can be accurately measured by combining with related optical elements such as polarizing plates. Such sensors usually have good resistance to external interference.
Using the principle of spectral changes in material absorption
The absorption spectra of some substances change with temperature, and real-time temperature can be obtained by analyzing the spectra transmitted by optical fibers. The main materials for this type of optical fiber temperature sensor include optical fibers, spectral analyzers, transparent crystals, atd. It can be divided into distributed, fiber optic fluorescence temperature sensors, and other types. In practical applications, sensors utilize the absorption characteristics of specific substances towards light. When the temperature changes, the absorption spectrum of this substance changes, which is reflected in the spectral changes of fiber optic transmission to achieve temperature measurement.
Principle of Fluorescence Characteristics
In the low temperature range (below 400 °C), the light-emitting diode emits modulated excitation light, which is coupled to the branching end of a Y-shaped fiber through a condenser lens, and then coupled to the fiber temperature sensing head through a fiber coupler. The end of the fiber optic sensing head is excited by excitation light and emits fluorescence. The fluorescence signal is derived from the fiber optic and emitted from the other branch of the Y-shaped fiber through a fiber optic coupler, which is received by a photodetector. The optical signal output by the photodetector is amplified and processed by the fluorescence signal processing system to calculate the fluorescence lifetime and obtain the measured temperature value. For example, some fluorescent fiber temperature sensors use special fluorescent materials, whose fluorescence lifetime and other characteristics are closely related to temperature. Temperature data can be obtained by detecting the fluorescence signal.

2、 Principles of different types of fiber optic temperature sensors

Functional fiber optic temperature sensor
This type of fiber optic temperature sensor utilizes the sensitive function inherent in the fiber optic itself to measure temperature. The fiber optic sensor senses and transmits information. For example, a certain optical characteristic of the fiber itself is sensitive to temperature. When the temperature changes, the transmission characteristics of the light inside the fiber naturally change, directly reflecting the temperature change situation. No additional sensitive components are needed to detect the temperature.
Transmission type fiber optic temperature sensor
Optical fibers only play a role in transmitting light, and other sensitive components must be installed on the fiber end face to form the new sensor. For example, installing a small temperature sensitive component at the end of a fiber optic cable. When the temperature rises or falls, the optical, electrical, or other physical properties of this sensitive component change, which affects the properties of the light transmitted through the fiber optic cable. By detecting the properties of the light, the temperature changes can be inferred.

Fiber OTP Model Fiber Temperature Sensor Common Brands

1、 Foreign brands

Opsens
Opsens’ fiber optic temperature sensors have a certain level of popularity in the market. For example, its OTP-A model fiber optic temperature sensor provides high performance for industrial applications. This sensor uses the principle of birefringence and specially selected crystals as the temperature conversion method. It has the characteristic of not exhibiting thermal creep or aging, and can work stably in some long-term industrial temperature measurement scenarios. It is compatible with Opsens’ WLPI signal demodulator and has inherent advantages of fiber optics, such as strong resistance to electromagnetic interference. In the fields of high electromagnetic, radio frequency, magnetic resonance, and microwave, under unfavorable conditions such as high voltage and rapid temperature cycling, it can provide good repeatability and reliability, suitable for electromagnetic, radio frequency, and microwave environments, high voltage environments, nuclear and hazardous environments, medical applications (some models), atd. Its standard operating temperature range is -40 ℃ to+250 ℃, and higher resolution and precision versions are also available.

FISO
FISO is a well-known sensor manufacturer. Known for its fiber optic temperature sensors such as FOT-L-SD and FOT-L-BA models. These models are highly suitable for measuring temperature in extreme environments such as low temperatures, nuclear environments, microwaves, and high-intensity RF. They have the characteristics of being completely unaffected by EMI (electromagnetic interference) and RFI (radio frequency interference), as well as small size, built-in safety devices for hazardous environments, high temperature resistance, corrosion resistance, and high precision. Based on fiber optic technology, sensors are essentially unaffected by EMI and RFI, while optical sensors are electronically inactive and do not emit or be affected by any type of EM radiation. They can provide accurate, stable, and reproducible temperature measurements. The temperature measurement range of FOT-L-SD is -40 ° C~300 ° C (-40 ° F~572 ° F), and the length of FOT-L-BA fiber optic lead sheath cable can reach several meters without affecting the quality and accuracy of measurement results. Its smaller design diameter makes the response time relatively faster, and the upper limit of temperature measurement is 250 ° C. And all temperature sensors of FISO need to be used in conjunction with corresponding signal conditioners.

2、 China brands

Fuzhou Inovace Elektronické Scie&Tech Co., S. r. o
This is a well-known manufacturer of fiber optic temperature sensors in China. It adopts advanced fluorescent fiber temperature measurement technology and has a strong R&D team dedicated to providing high-performance fiber temperature sensor solutions. The product has the characteristics of wide temperature measurement range, high accuracy, and strong anti-interference ability. And the manufacturer also provides personalized customization services, which can be tailored according to the specific needs of customers to meet the application needs of different fields. It has a good reputation in temperature measurement applications in various industries in China, especially in industrial fields that require high accuracy and stability, as well as in temperature measurement in special environments.

HGSKYRAY.com

 

HGSKYRAY. is a professional manufacturer specializing in the research and development of temperature sensors. The fiber optic temperature sensors produced by it are renowned for their high precision, stabilita, and sensitivity. The product has multiple models and specifications to choose from, suitable for various application scenarios such as industrial power, metallurgy, medical and other fields. Zároveň, they also provide comprehensive after-sales service to ensure smooth and satisfactory user experience during use. Temperature measurement has a wide range of applications in domestic industrial temperature monitoring and scientific research fields, such as being widely used in large industrial workshop temperature monitoring systems or precision temperature measurement in scientific research laboratories.

Comparison of Performance Parameters of Fiber OTP Type Fiber Temperature Sensor

1、 Measuring temperature range

OTP – Model A (Opsens)
Its standard operating temperature range is -40 ℃ to+250 ℃, and it can also provide higher resolution and precision versions. This temperature range basically covers most industrial and some conventional special environmental application scenarios. For temperature measurement in areas such as electronic device peripherals, ordinary industrial production workshops, and non extreme special industrial environments, it is sufficient. Nicméně, for scenarios with higher temperatures such as high-temperature industrial furnaces exceeding 400 °C, other more suitable sensors or specially customized versions may need to be considered.

FOT – L – SD（FISO）
The temperature measurement range is -40 ° C~300 ° C (-40 ° F~572 ° F), which can adapt to a wide range of temperature environments, especially with good measurement ability in low and relatively high temperature environments. It performs well in temperature measurement scenarios such as low-temperature refrigerated warehouses and some general high-temperature industrial equipment, and can adapt to various temperature scenarios ranging from cold outdoor environments to internal environments of industrial equipment with certain heat generation.

FOT – L – BA（FISO）
Its temperature measurement upper limit is 250 ° C, although slightly lower than FOT-L-SD at the high temperature upper limit, its smaller design diameter makes the response time relatively faster. This type of sensor is more suitable for temperature measurement scenarios that require fast response speed and a temperature range of 250 ° C. For example, it may perform better in temperature monitoring for small devices that require fast response to temperature changes or environments with rapid local temperature changes, such as small electronic component temperature monitoring.

2、 Accuracy and Resolution

OTP – Model A (Opsens)
It can provide high accuracy in the high-precision version (OTP-M module) and can achieve good performance when combined with Opsens’ WLPI signal demodulator. Although specific accuracy and resolution values have not been provided, it can still provide reliable measurements under complex and harsh conditions such as high electromagnetic, radio frequency, magnetic resonance, and microwave fields, high voltage, and fast temperature cycling. This indicates that it has certain advantages in accuracy and stability, especially when facing situations with many interference signals and complex environments, it can still accurately measure temperature changes. Nicméně, in different work environments, the final accuracy and resolution may be affected by specific settings and application requirements. For example, in laboratory level precision measurement scenarios with particularly strict accuracy requirements, more debugging and configuration optimization may be needed.
FOT-L-SD and FOT-L-BA (FISO)
This type of sensor can provide accurate temperature measurement, but there is also no specific numerical value for accuracy. Nicméně, from the perspective that it can be used for precise temperature measurement in medical clinical settings (where high precision is required), its accuracy must meet very high medical standards. And it can ensure normal operation and accurately measure temperature in extreme environments such as nuclear environments, indicating its strong ability to maintain accuracy. For resolution, the ability to achieve stable temperature measurement in various complex environments means that its resolution can also meet the needs of different environments, especially in detecting small temperature changes in environments such as microwave and high-intensity RF.
3、 Anti-interference ability

OTP – Model A (Opsens)
Has strong electromagnetic interference/radio frequency interference (EMI/RFI) and resistance to microwave interference. Using pure single crystal as the temperature conversion method, it does not exhibit thermal creep or aging, and can ensure stable measurement in environments with severe interference such as high electromagnetic, radio frequency, magnetic resonance, and microwave fields. This anti-interference ability is mainly due to its crystal structure and inherent characteristics of fiber optics, which make it highly advantageous for temperature measurement in environments with a large amount of electromagnetic and radio frequency signals, such as near high-voltage substations and around magnetic resonance equipment. It avoids measurement errors or even malfunctions caused by external interference.
FOT-L-SD and FOT-L-BA (FISO)
One of its significant advantages is that it is completely unaffected by EMI and RFI. Due to the characteristics of optical fibers and the design of sensors, they can operate normally and accurately measure temperature in any type of EM radiation scenario, whether it is microwave, RF, or NMR environment. This anti-interference ability makes it widely used in special scientific research environments such as temperature measurement around nuclear magnetic resonance laboratories, temperature monitoring around microwave heating equipment, and temperature measurement inside electronic devices that are particularly sensitive to electromagnetic interference.

4、 Sensor size and structural characteristics

OTP – Model A (Opsens)
Characterized by small size and sturdy design. This small size makes it easy to install in environments where installation space is limited, such as when installing a temperature measurement point for a certain component in a small space inside some electronic devices without being limited by space. Zároveň, the sturdy design ensures durability in harsh industrial environments such as high vibration factory workshops or work scenarios with mechanical collision risks, enabling stable operation without damage or measurement errors caused by minor collisions or vibrations.
FOT-L-SD and FOT-L-BA (FISO)
They are small in size and have built-in safety devices for hazardous environments. This small size is also beneficial for temperature measurement in various narrow spaces. In the field of biomedicine, such as temperature monitoring of internal tissues of the human body, it can reduce invasiveness to the human body. The built-in safety device enables it to be safely used in environments with high temperature and pressure hazards, such as nuclear environments. Even if the sensor itself is damaged, it will not pose any other safety risks, ensuring the safety of use in hazardous environments.

Fiber OTP model fiber temperature sensor application scenarios

1、 Industrial sector

Application in power system
It plays an important role in monitoring the surface temperature of power cables and the temperature in densely populated areas of cables. Due to the thermal effect of current during long-term power transmission, cables generate heat. Fiber optic temperature sensors can monitor the temperature of cables in real time, preventing cable failures or even fires caused by high temperatures. For example, in some large substations or underground pipelines with dense cable laying in cities, FOT-L-BA and other types of sensors can conveniently monitor cable temperature in a distributed manner, and their anti electromagnetic interference ability can adapt to the strong electromagnetic environment around the substation.
The monitoring of heating prone areas within high-voltage distribution equipment is also an important application scenario for fiber optic temperature sensors. The switch contacts and other parts inside the switchgear are prone to heating up due to contact resistance and other reasons during operation. Fiber optic temperature sensors can accurately measure and monitor the temperature of these heat prone parts, detect potential safety hazards in advance, and ensure the normal operation of high-voltage distribution equipment. Sensors like OTP-A, with their excellent anti-interference ability and adaptability to high voltage environments, can be well applied in such scenarios.
The same applies to environmental temperature detection and fire alarm systems in power plants and substations. Temperature sensors are distributed in various areas such as the computer room of power plants and the distribution room of substations. When the ambient temperature rises to a certain threshold, an alarm can be issued in a timely manner to prevent accidents such as fires.
The measurement of temperature distribution, thermal protection, and fault diagnosis for various large and medium-sized generators, Transformátory, and motors is also a very important application direction. For example, installing fiber optic temperature sensors in key parts such as the stator and rotor of a generator can obtain temperature information in a timely manner, and then determine the operating status of the equipment based on the temperature distribution. Measures can be taken to protect or repair the equipment before the temperature rises abnormally, extending its service life.
Application in industrial production and processing
In the temperature monitoring of metallurgical furnaces, although some fiber optic temperature sensors have insufficient measurement limits to cover the ultra-high temperature of the furnace, they have great advantages in temperature monitoring of auxiliary equipment around the furnace and workpiece temperature monitoring during metal processing. For example, in some high-temperature rolling workshops, fiber optic temperature sensors can accurately measure the surface temperature of rolling rolls and steel, adjust rolling process parameters according to temperature conditions, and ensure product quality.
In chemical production workshops, due to the presence of various chemical substances, sensors are prone to corrosion, and fiber optic temperature sensors have the characteristic of corrosion resistance, which can accurately measure the temperature of key equipment such as reaction vessels and pipelines. Some fiber optic temperature sensors with corrosion-resistant outer layer materials, such as sensors with PTFE outer layer, can adapt well to the harsh chemical environment in chemical workshops and avoid the problem of traditional metal sensors being easily corroded.

2、 Medical field

Application in clinical medicine
It has unique advantages in measuring the temperature of internal tissues in the human body. Fiber Bragg grating sensors are currently the smallest sensors that can measure the internal functions of human tissue with minimal invasion, providing accurate local information about temperature. For example, in the process of tumor hyperthermia, precise real-time measurement of the temperature of tumor tissue is required. Fiber optic temperature sensors such as FOT-L-SD can take advantage of their high precision and immunity to electromagnetic radiation interference. Zároveň, due to their small size, they have less insertion damage to human tissue.
In medical research, such as monitoring the temperature of cell culture media and biological samples in animal experiments, fiber optic temperature sensors can accurately control and measure temperature changes within a small range. Its high-precision temperature measurement capability helps researchers accurately obtain temperature data related to experiments and improve the accuracy of research results.
Application of Temperature Monitoring in Medical Equipment
For some medical devices, such as large X-ray equipment and magnetic resonance imaging (MRI) equipment, temperature monitoring inside is also crucial. These devices generate heat during operation due to the operation of electronic components. If the temperature is too high, it can affect the performance of the devices and even cause malfunctions. Fiber optic temperature sensors can be installed in suitable locations inside the equipment to monitor the temperature of critical areas in real-time, ensuring the normal operation of the equipment. Sensors like Opsens’ OTP-A model are suitable for temperature monitoring around MRI equipment due to their anti electromagnetic interference advantages.

3、 Aerospace field

Internal temperature monitoring of aircraft
In the aerospace industry, an aircraft requires the use of over 100 sensors to monitor pressure, temperature, vibrace, fuel level, landing gear status, wing and rudder positions, and more. Compared to other sensors, fiber optic temperature sensors have the advantages of small size and light weight. For example, inside an aircraft engine, due to limited space and high requirements for high temperature and vibration resistance of sensors, fiber optic temperature sensors can adapt to the high-temperature environment inside the engine and accurately measure temperature, providing temperature data support for the normal operation of the engine.
In the fuel system of an aircraft, it is necessary to monitor the temperature of the fuel. Fiber optic temperature sensors can be installed in the fuel pipeline or inside the fuel tank to obtain real-time fuel temperature information. Because the temperature changes of aviation fuel can affect its physical and chemical properties, such as density, viscosity, atd., which in turn affect the flight performance of aircraft, timely and accurate temperature measurement is helpful for flight safety management.
Temperature monitoring of spacecraft components
It plays an important role in temperature monitoring of spacecraft battery packs. The battery pack of spacecraft is responsible for power supply tasks in the space environment, and its performance is greatly affected by temperature. Fiber optic temperature sensors can monitor the temperature of battery packs, ensuring that the batteries operate within an appropriate temperature range and preventing performance degradation, shortened lifespan, or even failure due to high or low temperatures.

In the thermal protection system of spacecraft, such as the thermal protection layer of a return spacecraft, it will experience high temperatures when returning to the Earth’s atmosphere, and real-time monitoring of the temperature of the thermal protection layer is required. Fiber optic temperature sensors can meet the needs of high temperature measurement and accurate temperature measurement in harsh space environments, providing effective temperature data guarantee for the safe return of spacecraft.

4、 Construction field

Temperature measurement in health monitoring of large building structures
Especially, fiber Bragg grating temperature sensors are easily embedded in materials to measure the temperature inside with high resolution and over a wide range. In large structural buildings such as bridges and dams, temperature changes can have stress effects on the structure. For example, by burying fiber optic temperature sensors at different depths inside the dam, the temperature changes inside the dam can be monitored to evaluate the impact of temperature changes on the structural strain of the dam. In 1999, 120 fiber optic grating temperature sensors were installed on a steel bridge on the LasCruces 10 interstate highway in New Mexico, USA to monitor temperature changes and provide data basis for safety monitoring and early warning of the bridge.
Temperature monitoring and energy-saving management of internal environment in buildings
Inside buildings, fiber optic temperature sensors can be distributed in various rooms or public areas to accurately measure indoor temperature. This helps to achieve precise control of temperature regulation systems such as intelligent ventilation and air conditioning in buildings, improving energy efficiency. By real-time monitoring and analysis of temperature in different regions, the operation strategy of temperature regulating equipment such as air conditioning can be optimized to reduce energy consumption. Zároveň, in some special architectural sites such as museums, art galleries, and other places with strict requirements for indoor temperature and humidity, fiber optic temperature sensors can accurately measure temperature and work with other equipment to ensure that the indoor microenvironment meets the requirements for the preservation of cultural relics and artworks.

Fiber OTP Model Fiber Temperature Sensor Selection Guide

1、 Clarify the demand environment

Electromagnetic environment considerations
If temperature measurement is carried out in an electromagnetic/radio frequency environment, such as near substations, radar stations, or in environments with dense industrial electrical equipment, traditional temperature measurement methods should be given priority when they are severely interfered with and cannot work properly. Fiber optic temperature sensors with strong anti electromagnetic interference capabilities should be selected. Fiber optic temperature sensors such as FISO’s FOT-L-SD and FOT-L-BA models, as well as Opsens’ OTP-A model, can operate normally and accurately measure temperature in high electromagnetic environments. For temperature measurement in nuclear magnetic resonance equipment rooms or near microwave heating equipment, the sensor’s ability to resist electromagnetic interference is extremely high. Fiber optic temperature sensors have become the preferred choice due to their non electromagnetic interference characteristics, which can avoid measurement errors and signal instability.
Special environmental requirements
When in flammable, výbušný, and corrosive environments, there are special requirements for safety/corrosion resistance, such as in petrochemical workshops, refineries, or hazardous chemical storage warehouses. Fiber optic temperature sensors are more suitable due to their inherent safety and corrosion resistance. In the chemical workshop, there are various corrosive gases and liquids, and the corrosion-resistant outer layer material of the sensor (such as PTFE) can ensure its normal operation. Zároveň, optical fibers themselves do not generate dangerous factors such as electric sparks, and can safely measure temperature in flammable and explosive environments, ensuring production safety.
Installation space restrictions
If the installation environment is narrow and there are special requirements for sensor size, such as temperature measurement in some microelectronic devices, precision medical instruments, or narrow industrial equipment gaps, fiber optic temperature sensors with small size characteristics such as FISO’s FOT-L-SD and FOT-L-BA models are more suitable. They can be installed in limited space and accurately measure temperature without affecting the accuracy and stability of the measurement due to space limitations.
2、 Measurement points and installation layout

Number of measurement points
Based on the number of measurement points required, determine whether to use “distributed” or “single point” sensors, which involves issues of single point cost, total cost, and installation layout. Usually, when there are less than 50 Měřicí body, a “single point type” such as a fluorescent sensor is used; When there are more than 50 Měřicí body, “distributed” sensors such as fiber Bragg grating sensors are usually used. For example, measuring the temperature of several key components inside a small device may only require a few single point fiber optic temperature sensors, in which case the cost-effectiveness of single point sensors is higher. For large-scale temperature distribution measurement within bridge structures or temperature monitoring in multiple areas of large industrial plants, distributed fiber optic temperature sensors are needed to achieve comprehensive and efficient temperature measurement. Although the initial cost may be high, it is a better choice in terms of overall long-term monitoring effect and cost efficiency.
Installation layout convenience
If the structure of the measurement site is complex, such as in the case of many obstacles inside large machinery or building structures, in addition to considering the size and shape of the sensor itself, factors such as the flexibility and bendability of the optical fiber also need to be considered. A flexible fiber optic temperature sensor can be installed and laid out more conveniently in this situation, ensuring that each measurement point can accurately place the sensor. Zároveň, the fiber optic cable can adapt to complex environments during the wiring process, and will not be damaged or affect the transmission of optical signals due to excessive bending, thereby ensuring the effectiveness and stability of the entire temperature measurement system.

3、 Measurement temperature range and accuracy requirements

Temperature range matching
Understanding the temperature range requirements for actual measurements is crucial. If it is in high-temperature environments such as around industrial furnaces, high-temperature components of engines, atd., it is necessary to choose fiber optic temperature sensors that can adapt to the high temperature range. Sensors like FOT-L-SD have a temperature measurement range of -40 ° C to 300 ° C, making them suitable for some relatively high temperature industrial environments. For some measurements in low-temperature environments, such as refrigerated storage and low-temperature biological sample storage, it is necessary to ensure that the low-temperature measurement capability of the sensor also meets the requirements. Some fiber optic temperature sensors are specifically designed with different models for different temperature ranges, so it is necessary to select the appropriate sensor based on the actual temperature upper and lower limits of the measurement environment to avoid situations where the temperature exceeds the sensor’s measurement range and causes inaccurate measurement or damage to the sensor.
Determination of precision requirements
The accuracy requirements for temperature measurement vary in different application scenarios. In some scientific research experiments, such as high-precision chemical experiments, biomedical experiments, and other scenarios that require precise temperature control, as well as in temperature monitoring of some precision instruments and equipment, such as high-end microscopes and precision electronic chip manufacturing equipment, high-precision fiber optic temperature sensors are needed. The temperature measurement accuracy is usually divided into five levels: ± 0.05, ± 0.1, ± 0.3, ± 0.5, ± 1, and the corresponding sensor is selected according to the specific application accuracy requirements. For example, high-precision measurement of human body temperature in clinical medicine may require fiber optic temperature sensors with an accuracy level of ± 0.05, while for some ordinary industrial environment temperature monitoring, sensors with an accuracy level of ± 0.5 or ± 1 may be sufficient to meet the requirements.

4、 Probe characteristics and signal interface

Probe working type
The working types of probes include immersion type, contact type, and medical type. Immersion sensors can be used to measure the temperature of solids, liquids, and gases, such as temperature measurement in industrial liquid tanks. Immersion sensors are specially treated, and the strength and toughness of optical fibers are strong, which can resist chemical corrosion in liquid tanks. Contact sensors are specialized in measuring the temperature of object surfaces, such as temperature monitoring of high-voltage equipment such as dry-type transformers, high-voltage switchgear, and high-voltage busbars. Medical sensors are specially designed for life science measurements, with small and thin probes that, when paired with dedicated demodulation devices, can achieve fast response speeds and very high accuracy. So it is necessary to choose the appropriate probe type for fiber optic temperature sensors based on whether the actual measured object is a solid surface, liquid interior, or biological tissue.
Selection of signal output interface
Signal output is divided into analog output and digital output. There are two types of analog outputs: 0-5V/10V voltage output and 4-20mA current output. Digital outputs include RS-232, RS-485, USB, atd. Select the signal output interface of the fiber optic temperature sensor based on the signal types that downstream devices (such as data acquisition cards, control systems, atd.) can receive. If integrated with existing industrial control systems that can only receive 4-20mA current signals, then it is necessary to choose fiber optic temperature sensors with this analog output interface. In some industrial scenarios or laboratory data acquisition and analysis systems with high levels of automation that require long-distance data transmission and centralized data collection and processing, digital output interfaces such as RS-485 are more suitable for parallel connection of multiple sensors and connection with computers and other devices for data transmission and analysis operations.