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Fiber Optic Sensor News

Date:2019-06-03 13:25:27

Fiber optic sensor application types

According to the principle, the fiber optic gyroscope can be divided into interference type, resonance type and Brillouin type. This is the first generation interferometric fiber optic gyroscope of the third generation fiber optic gyroscope. At present, this technology is mature and suitable for mass production and commercialization; the second generation The resonant fiber optic gyroscope is still in the development stage of laboratory research to practical use; the third generation Brillouin type is still in the theoretical research stage.


The fiber optic gyro structure has three implementation methods depending on the optical components used: small discrete component system, all-fiber system and integrated optical component system. The discrete optical component technology has been basically withdrawn. The all-fiber system is used in open-loop low-precision, low-cost fiber. In the gyro, the integrated optical device gyro is popular in high-precision fiber optic gyro because of its simple process, good overall repeatability and low cost, and is the main implementation method. Second, the fiber grating sensor.

At present, one of the research hotspots in the field of sensors at home and abroad is that fiber Bragg grating sensors can be basically divided into two types: The disadvantages of the light intensity type and the interference type light intensity type sensor are that the light source is unstable, and the fiber loss and the detector are easy to age; the interference type sensor requires the fixed reference point and the application is inconvenient because the light intensity of the two channels of interference light is required to be equal.

At present, the fiber Bragg grating sensor based on fiber Bragg grating can avoid the above two situations, and the sensing signal is wavelength modulation and has strong multiplexing capability. Fiber grating sensors are the most ideal sensitive components for applications such as building health testing, impact testing, shape control and vibration damping testing. Fiber Bragg Grating sensors are used in a wide range of applications in geodynamics, spacecraft, power industry and chemical sensing.

Third, fiber optic current sensor


The fiber optic hydrophone is mainly used to measure the underwater acoustic signal. It converts the underwater acoustic signal into an optical signal through high-sensitivity fiber coherent detection, and transmits it to the signal processing system for identification. Compared with traditional hydrophones, fiber optic hydrophones have high sensitivity, wide response bandwidth, and are free from electromagnetic interference. They are widely used in military and petroleum exploration, environmental testing and other fields, and have great potential for development. According to the principle, the fiber-optic hydrophone can be divided into interference type, intensity type, grating type and other interferometric fiber-optic hydrophones. The key technologies have been gradually developed and matured, forming products in some fields. Fiber-optic grating hydrophones are the hotspot of current research. Key technologies include light sources, fiber optic devices, probe technology, anti-polarization fading technology, anti-phase fading technology, signal processing technology, multiplexing technology and engineering technology.

Combining these types of application-type fiber optic sensors, let's look at the fiber optic sensors in practical applications.


Application of fiber optic sensors in perimeter security Among many perimeter security monitoring technologies, optical fiber sensing technology stands out and can realize almost all the functions of traditional sensors. It can detect various physical quantities such as displacement, vibration, pressure, temperature, speed and flow. It has high sensitivity and no electromagnetic. Radiation, large dynamic range, wide adaptability, etc., is the mainstream direction of security technology development. In the field of fiberoptic sensing security applications, fiber optic detectors of various types and functions have been successfully developed and applied to governments, military, banks, airports, ports, oil companies, nuclear power plants, etc., including: Boundaries, pipelines, communications, municipalities, prison security monitoring, etc.




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