INNO fibre optic temperature sensors ,temperature monitoring systems.
Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China
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The Best Fiber Optic Temperature Monitoring Manufacturer Selection Guide
When choosing the best fiber optic temperature monitoring manufacturer, factors such as market position, technological level, product performance, customization service capability, and after-sales service should be considered. Here are some key points based on search results:
Market position and reputation
Choosing a manufacturer with a good market position and reputation is the primary consideration. For example, Fuzhou Yingnuo Technology, as one of the well-known manufacturers of fiber optic temperature sensors, has a high market position and reputation.
Technical level and innovation capability
The R&D and technological innovation capabilities of manufacturers directly affect the performance and quality of their products. Fuzhou INNO Technology has a strong R&D team dedicated to providing high-performance fiber optic temperature sensor solutions.
Product performance and quality
The performance and quality of a product are key indicators for evaluating the quality of a manufacturer.
HGskyray fiber optic temperature sensor products are renowned for their high precision, stability, and sensitivity, and are suitable for various application scenarios.
Customized service capability
Manufacturers who can provide personalized customization services are better able to meet the special needs of different customers. FJINNO Technology provides personalized customization services, tailored to meet the needs of customers.
after-sale service
Comprehensive after-sales service can ensure smooth and satisfactory use for users. HGskyray provides comprehensive after-sales service to ensure smooth and satisfactory user experience during use.
In summary, when choosing the best fiber optic temperature monitoring manufacturer, factors such as market position, technological level, product performance, customization service capability, and after-sales service should be comprehensively considered.
1. Classification and Characteristics of Fiber Optic Temperature Monitoring Technology
1.1 Fiber optic temperature monitoring technology is mainly divided into the following categories:
Phase modulated fiber optic temperature sensors, such as Mach Zehnder (MZ) interferometers, Fabry Perot interferometers, fiber Bragg grating temperature sensors, etc. In addition, there are amplitude modulation types such as micro bending loss modulation, polarization modulation, etc. This type of sensor monitors temperature based on the phase change of light, with a complex principle but high sensitivity.
Thermal radiation fiber temperature sensor: uses the thermal radiation generated inside the fiber to sense temperature, based on the blackbody radiation phenomenon generated by the hotspots in the fiber core, such as sapphire fiber temperature sensors. Suitable for scenarios that require high-precision monitoring of temperature changes.
Optical fiber temperature sensor: using optical fiber as a sensor for transmitting measurement signals, the sensitive component is not optical fiber, such as semiconductor light absorption sensors, fluorescent fiber temperature sensors, thermochromic effect fiber temperature sensors, etc. Its advantage lies in the ability to utilize existing fiber optic transmission networks to reduce costs.
Temperature sensors based on fiber optic nonlinear effects, such as Raman effect (ROTDR), Brillouin effect (BOTDR), etc. This type of sensor obtains temperature information by measuring the scattering effect of light in optical fibers, and can achieve long-distance distributed temperature detection. It is widely used in some large-scale projects, such as temperature monitoring of cables along the entire line.
1.2 Fiber optic temperature sensors generally have the following advantages:
Strong anti-interference ability: Due to the characteristics of fiber optic materials, fiber optic temperature sensors are basically unaffected by external electromagnetic fields and can accurately monitor temperature in strong electromagnetic environments. For example, in places with strong electromagnetic fields such as substations and near electrical equipment.
Easy to install and highly adaptable: The fiber optic cable is slim and soft, making it easy to lay and install. It can also adapt to various environments, whether it is high temperature, low temperature, humid environment, harsh outdoor environment, narrow space or dangerous area, etc. It can be used, such as in the laying of underground pipeline networks, submarine cable monitoring, etc., taking advantage of its advantages.
Safe and reliable: Fiber optic itself is non-conductive and does not generate electrical sparks. It is very safe to use in flammable, explosive and other hazardous environments, such as temperature monitoring in oil and gas stations, coal mines and other underground environments.
2. Principle and Application of Fluorescent Fiber Temperature Monitoring Technology
2.1 Principle
Fluorescence fiber temperature monitoring technology is a new sensing technology based on rare earth ion doped optical fibers. When doped optical fibers are excited by specific wavelength lasers, rare earth ions absorb light energy, transition to higher energy levels, and then return to the ground state in the form of spontaneous emission, emitting fluorescence. Both fluorescence intensity and fluorescence lifetime are temperature dependent, but lifetime based fluorescence temperature measurement is the main aspect utilized. Because as the temperature increases, the thermal equilibrium process of the excited state particle number distribution accelerates, resulting in a shortened fluorescence lifetime. By measuring the fluorescence attenuation curve and fitting the data, the fluorescence lifetime can be extracted, and then the fiber temperature can be calculated. The dependence of fluorescence lifetime on temperature is more stable and not affected by factors such as excitation light intensity, fiber bending, and joint loss.
2.2 Application
Power equipment monitoring
Transformer: It can be used for temperature monitoring of dry-type transformers and oil immersed transformer windings. Continuously collect real-time temperature data of transformer windings, automatically store the highest temperature data, and display, record, store, and alarm output these data. This helps the staff to timely grasp the temperature situation of the transformer, take measures when the temperature is too high, prevent transformer failures, and ensure stable transmission and distribution of electrical energy.
Switchgear: solves the problems of high labor intensity, inaccurate monitoring, and inability to continuously monitor multiple points in high-voltage switchgear. Real time monitoring of the temperature rise of high-voltage electrical contacts can provide timely warnings when factors such as aging, excessive contact resistance, or long-term high current cause cables and switches to generate heat during high load operation. This can prevent accidents caused by contact erosion or high-temperature deformation and carbonization of insulation isolation covers, thereby ensuring the safe and stable operation of the power grid.
Chemical reaction process monitoring: In chemical plants, the key points of chemical reactions are often related to temperature. Fluorescence fiber optic temperature measurement technology, with its high precision and strong anti-interference ability, can be used to monitor the temperature during the chemical reaction process, ensuring the safety and stability of the reaction and avoiding adverse chemical reactions or chemical accidents caused by temperature deviations.
Tank and pipeline monitoring: used to monitor the temperature of petrochemical tanks and pipelines. If the temperature in the pipeline is too high, it may cause fire or explosion. Through fluorescence fiber temperature monitoring technology, real-time temperature values can be obtained. When the safety threshold is exceeded, timely response can be made to prevent disasters and accidents caused by high temperature and ensure the production safety of petrochemical enterprises.
Application in the field of transportation
Tunnel and bridge monitoring: It can be used to monitor the temperature of structures such as tunnels and bridges. By monitoring the temperature of these transportation infrastructure, its thermal stress state can be evaluated, preventing structural damage or deformation, helping to timely detect potential safety hazards, ensuring the safety and stability of tunnel and bridge structures, extending their service life, and reducing maintenance costs.
Rail transit: In subway, light rail and other rail transit systems, it can be used to monitor the temperature of power equipment, ensure the normal operation of power equipment in the rail transit system, guarantee the overall safety, reliability and efficiency of rail transit, and reduce the risk of shutdown caused by temperature problems in power equipment.
Application in the field of new energy
Wind power generation: used to monitor the temperature of wind turbines, ensure that they operate within the optimal temperature range, improve their power generation efficiency and extend their service life, reduce the cost of wind power generation, and to some extent enhance the economic benefits and sustainable development capacity of the wind power industry.
Photovoltaic power generation: Directly measuring the temperature of photovoltaic cells to achieve continuous temperature control can improve the efficiency of photovoltaic power generation, optimize the performance of photovoltaic power generation systems, and improve the efficiency of solar energy resource utilization.
Biomedical field
Human tissue temperature measurement: It can be used to monitor temperature changes in human tissues, providing important basis for disease diagnosis and treatment efficacy evaluation. For example, in the treatment of some special diseases (such as tumor hyperthermia), accurate monitoring of tissue temperature is required. Fluorescence fiber optic temperature measurement technology can provide more accurate temperature data to determine the effectiveness and safety of treatment.
Thermal therapy equipment: In thermal therapy equipment, it can be used to monitor temperature information at the lesion site, ensuring the safety and effectiveness of thermal therapy. The temperature range of thermal therapy is crucial. If it exceeds the appropriate range, it may cause damage to normal human tissues. Accurate temperature monitoring can prevent such incidents and improve the level of thermal therapy.
3. Advantages and limitations of distributed fiber optic temperature monitoring technology
advantage
Accuracy and sensitivity aspects
High precision: Distributed fiber optic temperature monitoring technology can measure temperature within a millimeter level accuracy range, which is more accurate than many traditional temperature measurement devices. This high-precision feature is crucial in some scenarios that require precise temperature monitoring, such as in some high-precision industrial manufacturing processes or scientific research experiments, where even small temperature deviations can have a huge impact on the results.
High sensitivity: It can achieve high-sensitivity measurement of temperature and detect small temperature changes. In environmental monitoring, even small fluctuations in environmental temperature can be accurately detected, which helps to timely detect temperature trends in the environment and facilitate precise decision-making for environmental protection and resource management.
In terms of monitoring scope
Long distance monitoring: Temperature measurement can be achieved within a range of several kilometers to hundreds of kilometers, covering a large area. This makes it highly advantageous when applied to long-distance transmission facilities (such as oil pipelines during long-distance oil transportation) and large structures (such as large bridges, tunnels, etc. for overall temperature monitoring). It can reduce the number of sensors installed, lower system costs, and improve the overall and coherent monitoring.
Distributed measurement characteristics: It can not only obtain temperature information from a single point, but also monitor multiple temperature points along the fiber optic cable in real time, and accurately locate each measurement position. For example, in an area with multiple possible temperature anomalies (such as large energy facilities), a distributed fiber optic temperature monitoring system can simultaneously detect the temperature of each location and determine its specific location, thereby comprehensively grasping the overall temperature distribution.
In terms of adaptability to the work environment
Strong anti-interference ability: Fiber optic sensors have excellent anti-interference performance and are not affected by external electromagnetic interference. It can still operate normally in high electromagnetic environments (such as around substations, high-voltage transmission lines, and many other power facilities) or complex electromagnetic environments (such as some electronic equipment manufacturing workshops and other special electromagnetic environments), ensuring the accuracy and stability of temperature monitoring.
High safety: Fiber optic sensors do not require power supply, so they do not generate electromagnetic interference or sparks. They can be safely used in hazardous environments (such as mines and other flammable and explosive places, chemical and other dangerous places), reducing the risk of safety accidents such as explosions. In addition, optical fibers have good chemical properties such as water resistance, high temperature resistance, and corrosion resistance, and can also adapt to harsh chemical environments, suitable for temperature monitoring needs in various special places.
Other advantages
Real time monitoring: It can achieve real-time monitoring of temperature changes, quickly obtain data, and promptly detect problems and take corresponding measures. For example, in temperature monitoring of power cables, real-time monitoring can detect abnormal temperature increases in the cables in a timely manner, avoiding accidents such as power outages caused by cable damage due to overheating, and ensuring the stability and safety of power supply.
Good economy: relatively low in terms of installation and long-term maintenance costs. The installation process is relatively simple, and the long lifespan and low error rate of fiber optic materials make the distributed fiber optic temperature monitoring system highly economical and feasible, with good cost-effectiveness advantages in long-term large-scale temperature monitoring projects.
limit
There are limitations in spatial resolution: although it is possible to locate multiple measurement points in distributed measurements, spatial resolution may not be able to meet the requirements of some ultra high precision positioning and measurement scenarios, such as providing sufficiently accurate spatial position information in some ultra small range local temperature positioning and monitoring scenarios.
The technical complexity is relatively high: the principle of distributed fiber optic temperature monitoring technology is based on complex optical principles such as backward Raman scattering temperature effect of optical fibers and optical time domain reflectometry (OTDR) technology, which requires relatively high equipment requirements and professional technical personnel and corresponding equipment for system design, operation, and maintenance. This has to some extent posed obstacles to the popularization of application scenarios, such as some small businesses or units with low technical requirements and capabilities finding it difficult to carry out temperature monitoring using this technology on their own.
4. The Development Status of Fiber Bragg Grating Temperature Monitoring Technology
Fiber Bragg Grating Temperature Monitoring System has been widely used in various fields:
4.1 In terms of electricity:
Temperature monitoring of switchgear: This technology arranges fiber optic grating sensors inside or around the switchgear to monitor the temperature inside the switchgear in real time. In power transmission and distribution systems, the normal operation of switchgear is closely related to the stability and safety of the power system. Monitoring can effectively prevent equipment failures caused by high or low temperatures, ensuring stable power transmission and safe operation of equipment in daily power distribution environments.
Temperature monitoring of power distribution cabinets in industrial and mining enterprises: early warning of equipment abnormalities to ensure production safety. Traditional methods for monitoring the temperature of distribution cabinets are often unable to adapt to high temperatures, corrosive environments, and other conditions. Fiber Bragg grating sensors are small in size, light in weight, and have strong resistance to electromagnetic interference and corrosion, making them more suitable for monitoring the temperature of distribution cabinets in complex and harsh production environments in industrial and mining enterprises. This ensures reliable power supply during the production process and avoids risks such as production line downtime and losses caused by abnormal distribution cabinet temperatures.
Temperature monitoring of building electrical rooms: To avoid the impact of high temperature environments on the lifespan of electrical equipment, relevant operation and maintenance personnel can be informed of the environmental temperature conditions in a timely manner, so that appropriate maintenance measures such as heat dissipation can be taken to reduce problems such as line aging and electrical failures caused by high temperature of electrical equipment.
Other industrial environment applications
4.2 Oil and gas exploration: In the oil and gas exploration environment, the environment is often harsh (such as high temperature, high corrosion), and there is a high demand for accurate temperature monitoring (such as the temperature at different depths underground during drilling). The small size, light weight, fast response time, strong resistance to electromagnetic interference and corrosion of fiber optic grating temperature sensors enable them to perform temperature monitoring work normally, provide accurate temperature data support for exploration activities, and ensure the safety and efficiency of the exploration process. For example, understanding the temperature distribution of oil layers can assist in the formulation of mining strategies.
In the field of aerospace, there are strict requirements for temperature monitoring accuracy, stability, and sensor size and weight. Fiber Bragg grating sensors, due to their advantages, can be well integrated into aerospace equipment to accurately monitor the temperature of key components inside the aircraft, ensuring the normal operation of aerospace equipment. For example, temperature monitoring of core components inside aircraft engines, satellite key instruments, etc. ensures that the equipment still works normally in different flight environments, providing guarantees for the smooth completion of aerospace missions.
4.3 Biomedical field
In terms of disease diagnosis, fiber optic grating nucleic acid sensing utilizes the interaction between fiber optic grating and nucleic acid molecules to detect and quantify nucleic acid sequences, which can be used for gene diagnosis. By detecting the characteristic temperature changes of nucleic acid sequences related to specific diseases, it can provide a basis for early diagnosis of diseases. For example, in the diagnosis of some infectious diseases, monitoring the temperature changes under the interaction between nucleic acid molecules in patient body fluid samples and fiber Bragg gratings to determine the source of infection has the advantages of high sensitivity, high selectivity, and rapid detection, which helps to quickly and accurately formulate medical plans.
Biomarker detection and imaging: Fiber Bragg grating protein sensing achieves qualitative and quantitative detection of proteins by detecting the interaction between proteins and receptors fixed on the surface of the fiber Bragg grating. Fiber Bragg grating sensing based on Surface Plasmon Resonance (SPR) can detect the interaction between biomolecules and the surface of the fiber Bragg grating. These technologies can be used to more accurately locate and identify biomarkers related to diseases in biomarker detection, which can assist in the diagnosis of diseases. In the field of biological imaging, fiber Bragg grating sensors can also accurately present temperature related information in the body, providing data for precision medicine of diseases.
5. Comparative Analysis of Three Fiber Optic Temperature Monitoring Technologies
5.1 Principle differences
Fluorescence fiber temperature monitoring technology: Temperature detection is based on the dependence of fluorescence intensity and fluorescence lifetime of rare earth ion doped optical fibers on temperature after excitation, where the dependence of fluorescence lifetime on temperature is the key measurement principle. For example, as the temperature increases, the thermal equilibrium process of the excited state particle number distribution accelerates, shortening the fluorescence lifetime. By accurately measuring the fluorescence lifetime, the temperature can be accurately calculated.
Distributed fiber optic temperature monitoring technology: usually based on nonlinear effects such as Raman scattering in optical fibers for temperature detection. Raman scattering technology utilizes the interaction between photons and molecules in optical fibers. When the fiber is affected by temperature, the interaction between photons and molecules causes a frequency shift in the scattered light. Based on this frequency shift, corresponding temperature information can be obtained, and the temperature distribution and position of multiple points along the fiber can be detected simultaneously.
Fiber Bragg Grating Temperature Monitoring Technology: It mainly uses the temperature changes of the medium inside the grating to cause changes in the refractive index inside the fiber Bragg grating, thereby changing the characteristics of the reflected light intensity inside the fiber. Taking fiber Bragg grating (FBG) as an example, it is a periodic refractive index structure of optical fibers. When the temperature changes, the Bragg wavelength of the grating will shift. By detecting this shift, temperature measurement can be achieved. In addition, FBG sensors can use multiplexing technology on a single optical fiber to achieve multi-point multiplexing and multi parameter distributed differential measurement.
5.2 Application Scenario Focus
Fluorescent fiber optic temperature monitoring technology plays an important role in monitoring power equipment, such as switchgear and transformers. With its advantages of good accuracy and strong anti-interference ability, it can accurately monitor equipment temperature in complex electromagnetic environments of power systems, ensuring the safety of power supply. At the same time, it also has unique application value in the biomedical field, such as strong adaptability to the measurement environment when measuring human tissue temperature, which will not cause too much interference to the human body and can provide stable measurement results. In addition, temperature monitoring of chemical reaction processes and temperature control monitoring of various new energy equipment are also commonly used technologies in fields such as chemical engineering.
Distributed fiber optic temperature monitoring technology: It is most suitable for long-distance and large-scale monitoring scenarios, such as temperature monitoring during long-distance oil pipeline transportation, and can cover pipeline temperature measurement needs of thousands or even hundreds of kilometers at once. In terms of transportation infrastructure, such as monitoring the overall temperature distribution of large bridges and tunnels, distributed fiber optic temperature monitoring technology has irreplaceable advantages in terms of cost and effectiveness. In addition, its distributed measurement characteristics can be well utilized in environmental temperature monitoring scenarios such as large natural environment areas (such as oceans, large areas of soil, etc.).
Fiber Bragg Grating Temperature Monitoring Technology: It is particularly prominent in scenarios that require high measurement accuracy and point based measurements, such as the precise monitoring of temperature of some performance critical small components inside aircraft in the aerospace field. The accuracy requirements for each component monitoring point are high, and the measurement effect of a single point is good. At the microscopic level of nucleic acid and protein detection in biomedical disease diagnosis, the high sensitivity and precision advantages of fiber Bragg grating sensors can be used for accurate measurement of biological molecule temperature response. And temperature monitoring at relatively precise locations within power equipment such as substations and distribution cabinets is also applicable.
5.3 Technical Performance Comparison
Accuracy and sensitivity
Fluorescent fiber temperature monitoring technology: Lifespan fluorescent fiber temperature measurement has high sensitivity and is not affected by factors such as excitation light intensity, fiber bending, and joint loss. The measurement accuracy is relatively high. For example, it can accurately feedback the temperature situation when monitoring local overheating of some high-precision power equipment.
Distributed fiber optic temperature monitoring technology: Its accuracy can reach millimeter level, and it has extremely high sensitivity, which can detect small temperature changes. Changes within a small range of millimeter level can also be accurately captured, such as the detection of micro temperature differences in materials in some industrial high-precision manufacturing scenarios.
Fiber Bragg Grating Temperature Monitoring Technology: Based on specific needs, it can achieve high accuracy, especially in some single parameter measurements. It can optimize the accuracy for different application scenarios to meet the relevant measurement accuracy requirements. And when combined with special detection technologies (such as phase sensitive detection), it can achieve sub millikelvin level ultra-high sensitivity, which plays a role in detection scenarios such as biomedical nanoscale.
Anti-interference ability
Fluorescent fiber optic temperature monitoring technology: Fiber optic itself is equivalent to a good isolation body, and the optical signal is not affected by electromagnetic interference. It has strong anti-interference ability and can work stably in areas with complex electromagnetic environments. For example, monitoring inside switchgear near high-voltage substations is not affected by external electromagnetic fields.
Distributed fiber optic temperature monitoring technology: anti-interference is also one of the outstanding characteristics. The fiber optic sensor is completely electrically insulated, and the signal is carried by the fiber optic without interference from the external electromagnetic environment. It can also operate normally in complex electromagnetic situations such as lightning weather and some high-voltage industrial environments to ensure accurate temperature measurement.
Fiber Bragg Grating Temperature Monitoring Technology: Fiber Bragg Grating sensors have strong anti-interference ability against electromagnetic interference, and they do not generate electromagnetic radiation themselves. They are very suitable for scenarios where electromagnetic interference needs to be avoided and other equipment needs to be protected from electromagnetic interference. For example, in the aerospace field, among the many precision electronic devices inside aircraft, sensors can still work accurately without electromagnetic interference.
5.4 Cost benefit comparison
Fluorescent fiber optic temperature monitoring technology: The sensor size is small, the long-term reliability is high, the price is moderate, and the cost-effectiveness is good in terms of short-term investment and long-term maintenance. Moreover, its construction and commissioning process is convenient and fast. In some small and medium-sized temperature monitoring scenarios, it can meet the requirements of accuracy without causing excessive cost investment, such as the layout of temperature monitoring points inside small chemical enterprises.
Distributed fiber optic temperature monitoring technology: In terms of installation and long-term maintenance costs, it is relatively low. When covering long-distance or large-area temperature monitoring at once, although the initial equipment investment may be high, in the long run, it is much more cost-effective for large-scale monitoring projects such as cross regional oil pipelines. Reduced the cost of frequent replacement and maintenance of scattered temperature sensors in the later stage.
Fiber Bragg Grating Temperature Monitoring Technology: In some special scenarios, if one intends to achieve ultra-high precision temperature monitoring for a single point or a few points, although the production cost of fiber Bragg grating sensors themselves is relatively high, they can meet high-precision measurement without excessive additional equipment, which has a good rationality in resource allocation and reflects certain cost-effectiveness advantages. For example, in high-end aerospace instrument temperature monitoring, the cost-effectiveness of single point monitoring is relatively high.
