The development and application of optical fiber temperature sensor

by:Thermistor-Mov     2020-04-24
The temperature sensor is * early development, * widely used type of sensor. Temperature sensor is based on a basic physical quantity 'temperature', which refers to can feel temperature translates into usable output signal of the sensor. Fiber since the 1970 s, with the development of laser technology, from the theory and practice have proved that optical fiber with a series of advantages, optical fiber sensing technology in the field of application is increasingly widespread attention, with the development of science and technology, have sprung up many optical fiber temperature sensor, and can be expected, in the tide of new technology of * *, optical fiber temperature sensor can be widely used, and play more role. The basic working principle of optical fiber temperature sensor is to light through the optical fiber from the light source to the modulator, and enter the modulation parameters under test temperature OuDeGuang interaction, leads to the optical properties of the light ( As the light intensity, wavelength, frequency, phase, etc. ) Change, is called a modulated signal light. Through the optical fiber into light detector, after demodulation, obtain the parameter being measured. Optical fiber temperature sensor is a lot of more phyletic, but summarized up according to its working principle can be divided into functional and shows two kinds. Functional properties of optical fiber temperature sensor is the use of optical fiber ( Phase, polarization, intensity, etc. ) The characteristics of the transformation of the temperature, temperature measurement. While this kind of sensor has the characteristics of preach, the sense of unity, but also increases the sensitization and difficulty to min. Both transmissive optical fiber temperature sensor of optical fiber is only have the effect of optical signal transmission, in order to avoid temperature measuring regional complex environment. Treat the modulation function of object is accomplished by other physical properties of sensitive element. This kind of sensors due to optical fiber and the sensing head light coupling problems, increase the complexity of the system, and is sensitive to interference, such as mechanical vibration, comparison. Since the advent of optical fiber temperature sensor. Mainly used in power system, building, chemical, aerospace, medical and Marine development, etc, and has achieved a large number of reliable application performance. Its application is a burgeoning field, has a very broad prospects for development, so far, there have been a lot of related research at home and abroad, although in sensitivity, measurement range, resolution, etc all have the very big development, but believe that with the deepening of the research, according to specific application purpose, there will be more and more higher precision, simpler structure, lower cost, more practical scheme is put forward, further promote the development of temperature sensor.
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