As a new technology developed with Fiber and Communication in 1970s, Optical Fiber Sensor technology was obtaining the fast development in recent years, and the fiber grating technology also benefits from his development. Fiber Brag Grating Sensor is one kind of wave length modulation optical pickoff. It contains survey and transmits two kinds of functions, and takes the optical fiber as the transmission medium. The light wave transmission characteristic can be changed with temperature, stress, vibration, humidity and other environment parameter. Compared with the traditional electrical sensors, the fiber grating sensors has lots of good abilities, such as: thermostable, anticorrosive, the corrosion resistance, light, easy to integrate, the essence guards against explosions, and anti-electromagnetic interference. [1][2]
In 1978, K. O. Hill and his partner found the photosensitivity in optical fiber and from then on, the fiber grating sensor has been developed rapidly. In particular in the last few years, along with the machine which can be used to produce fiber grating become more and more exactly, the people become more interested in optical fiber sensors. So the optical fiber grating as an important modern sensor was widely used in large-buildings, aviation, ships, electricity, coal mine and petroleum. Meanwhile, the wavelength demodulation techniques have also developed rapidly. Currently, a lot of wavelength detection methods, including spectroscopy method, matching grating, tunable Fabry-Perot, Non-balanced Mach-Zehnder tracking, Tunable Laser, etc. [3]
My research contains, Fiber Bragg grating, as one of the most developed passive fiber devices, has function of reflection to very wavelength, and its wavelength changed with temperature and strain, and has excellent filter properties, temperature and strain response, which is a novel fiber photonic device with rapid development in these years and has broad application in the fields of fiber communication and fiber sensor. Fiber Bragg grating (FBG) sensor is a new type of sensor, which has the advantages of resistance to high voltage, lightweight, low loss, non-sensitivity to the environment, small volume, high Signal-to-Noise and high sensitivity, anti-electromagnetism, better insulation and large bandwidth, being used as sensor and transmitting medium at the same time, and it is more easy to realize multipoint or distributed measure. Yet, the new technologies have been born only few years, so they should be researched and developed more deeply.
References:
[1] 王惠文, 江先进.光纤传感技术与应用 .国防工业出版社， 2001
[2] 郭凤珍, 于长泰.光纤传感技术与应用 .浙江大学出版社， 1992
[3] Hill K O, Fuji Y, Johnson D C, and Kawasaki B S. Photosensitivity in Optical Fiber Waveguides: Application to Reflection Filter Fabrication, Applied Physics Letters, 1978
December 9th, 2006 |
