Top 10 Global Manufacturers of Fiber Bragg Grating Temperature Monitoring Systems

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

Application of Fiber Bragg Grating Temperature Sensor System

Traditional sensors are susceptible to electromagnetic interference and cannot work in harsh environments. In recent years, they have gradually been replaced by fiber optic grating sensors. However, with the continuous expansion of the application range of fiber optic grating sensors, people’s requirements for their functions are also increasing. Environmental temperature detection is very necessary in industrial production and daily life. The commonly used method for detecting environmental temperature is to use an optical temperature sensor placed in a certain environment to measure the ambient temperature of that environment. In recent years, research on fiber Bragg gratings has become increasingly sophisticated and a hot topic in the field of fiber optics. With the deepening of research, the manufacturing process of fiber Bragg gratings and the photosensitivity of fibers have gradually improved, and fiber Bragg gratings have been widely used in various modern fields. Compared with other sensing devices, the advantages of low cost and high stability of fiber Bragg grating sensing devices make them widely used. At the same time, due to the fact that the grating itself is engraved in the fiber core, it is easy to connect with the fiber system and integrate the system, which makes fiber Bragg grating sensors convenient for application in various long-distance distributed detection systems.

Characteristics of Fiber Bragg Grating Sensor

As a new type of fiber optic passive device, it has gained widespread attention worldwide due to its advantages such as all-optical transmission, anti electromagnetic interference, corrosion resistance, high electrical insulation, low transmission loss, wide measurement range, easy reuse into a network, and miniaturization. It has become one of the fastest developing technologies in the sensing field and has been widely used in civil engineering, aerospace, petrochemical, power, medical, shipbuilding and other fields.

Fiber Bragg Grating Cable Temperature Measurement System

During the operation of cables, the wires will generate heat. Under the influence of factors such as excessive load, local defects, and external environment, the heating of cable wires will increase compared to normal conditions. Under long-term ultra-high temperature operation, the insulation material will quickly age and become brittle, and the insulation will be broken down, leading to short circuits and even fires, causing serious accidents. Usually, it is difficult to detect potential defects in the cable laying method during regular inspections, and it is often only after a malfunction or even an accident has occurred, causing significant losses, that remedial measures are taken.

Battery fiber optic temperature measurement device

Electrochemical energy storage is currently the most cutting-edge energy storage technology, among which lithium-ion batteries have become the most promising energy storage technology due to their high energy density, high power density and energy conversion rate, and light weight. Lithium battery pack is an important component of existing large-scale energy storage technology, which is composed of a large number of lithium battery cells connected in series and parallel. During the operation of lithium batteries, a large amount of heat accumulates due to internal chemical and electrochemical reactions, causing high temperatures and shortening their service life and posing safety issues. In addition, the temperature differences and imbalances between individual lithium battery cells can affect the lifespan of the entire lithium battery pack. At present, thermistor or thermocouple methods are commonly used for temperature monitoring of energy storage lithium battery packs. To monitor each individual lithium battery cell in the lithium battery pack, a large number of devices are required, wiring is complex, and the measurement signal is susceptible to electromagnetic interference. Therefore, the above two methods are not suitable for temperature monitoring of large-scale energy storage lithium battery packs.

Fiber Bragg Grating Temperature Measurement Scheme for Power System

Optical circuit board is the main component of onboard electronic products, and the performance of the circuit board directly affects the quality of onboard electronic products. Nowadays, as microelectronics technology enters the era of ultra large scale integrated circuits, the circuits in military aircraft are becoming increasingly complex. The widespread application of multi-layer printed boards, surface mount, and large-scale integrated circuits has made fault diagnosis of circuit boards increasingly difficult. According to Joule’s law, the current passing through a circuit during operation will generate heat dissipation. By comparing the temperature of the components, the location of the faulty component can be determined. People have begun to try to determine the working status of each component by detecting the temperature distribution and temperature changes during the operation of the circuit board, in order to locate faults on the circuit board. The most common method for diagnosing circuit board faults based on component heating currently is to use infrared thermal imagers to locate faults in the circuit board. However, the temperature resolution and accuracy of infrared thermal imagers are not high, and they can only roughly measure the temperature of a large area. Therefore, they cannot detect the temperature of some components with small temperature changes, nor can they accurately detect the temperature of some small components. In addition, the method of fault analysis through voltage detection of key points is only suitable for analyzing circuits with known schematics or circuits with simple structures. When analyzing faults in large-scale integrated circuit boards and circuit boards with unknown schematics, the efficiency is not high and it does not have replicability.

Principle of Fiber Bragg Grating Temperature Sensor

A sensor that detects temperature by detecting the shift in the center wavelength of the light signal reflected by an internal sensitive component – a fiber optic grating. Installation structures with different types of packaging such as surface, embedded, and immersion. Due to the fact that fiber optic grating temperature sensors use light waves to transmit information, and optical fibers are electrically insulated and corrosion-resistant transmission media, they are not afraid of strong electromagnetic interference. This makes them convenient and effective for monitoring in various large-scale electromechanical, petrochemical, metallurgical high-pressure, strong electromagnetic interference, flammable, explosive, and highly corrosive environments, with high reliability and stability. In addition, the measurement results of fiber optic grating temperature sensors have good repeatability, which makes it easy to form various forms of fiber optic sensing networks and can be used for absolute measurement of external parameters. Multiple gratings can also be written into one optical fiber to form a sensing array, achieving quasi distributed measurement.

Features of Grating Sensor Products:

Passive, uncharged, inherently safe, not affected by electromagnetic interference and lightning damage; Multi point serial multiplexing, high temperature measurement accuracy and resolution without being affected by light source fluctuations and transmission line losses, can directly transmit signals remotely through optical fibers (over 50km)