Fiber Bragg grating sensor demodulation research for new progress
fiber Bragg grating sensor demodulation research progress was made in
takeaway: although the large-scale, fast and cheap production technology of grating and the technology is mature, but still relatively expensive optical demodulation equipment limits its in the industry, chemical industry and is widely used in the field of building structure detection, and a series of important.
since the 1990 s, based on the fiber optic equipment Bragg grating sensing technology received extensive attention of scientists, and a lot of research. Although the large-scale, fast and cheap production technology of grating and the technology is mature, but still relatively expensive optical demodulation equipment limits its in the industry, chemical industry and building structure detection and so on a series of important in the field of a wide range of applications. In addition, compared with traditional optical domain demodulation method, using the optical filter grating wavelength drift into the change of the power of demodulation method is cheap, simple, fast response and other advantages.
after the optical communications and optical network is a summer associate professor led the team cross gaussian filter method was adopted to realize fiber optic equipment grating sensor demodulation, the results of the study was published in called Letters journal ( Vol. 国际空间站。 8, pp. 1760 - 1763). 。 With the deepening of the research, found that the method has the disadvantages of the two aspects: one is the need for an additional two gaussian filtering features of filter, adding the complexity of the system. The second is to use the wide spectrum light source power spectral density is small, makes the distance sensor demodulation and limited scope.
as a result, the research team work and further in the near future to design a kind of based on dual wavelength narrow linewidth laser incident of weak demodulation method of fiber grating sensor array ( FIG. 1) 。 In the demodulation system input, the use of two with a range of center wavelength interval of laser incidence. USES the gaussian spectrum characteristic of weak reflection fiber Bragg grating and power difference detection, just can get a linear Bragg wavelength conversion to the power difference ( FIG. 2) 。 And the slope of the linear relationship between them can simply by controlling the dual wavelength laser wavelength interval to adjust. This method does not like gaussian matched filtering method for filtering features of filter requirements, so the whole demodulation system is relatively simple. According to the current narrow linewidth laser, light source output power can be easily reached more than 10 DBM, this method under the condition of without relay amplify, can support up to 50 km above the sensing demodulation distance, and can achieve in a single fiber as many as hundreds of weak grating demodulation results at the same time. Can predict the method in the quasi distributed Bragg grating sensor network has very good application prospect in various fields.
the results of the study are 'double wavelength difference demodulation weak fiber optic equipment grating sensor' ( 审讯疲弱的布拉格光栅传感器基于双核 波长差检测) On November 9, 2016, published in called Letters ( Vol. 41岁的空间站。 22, pp. 5254 - 5257). 。
the work obtained the national natural science fund project (on the surface of 61675078). Funding.
graph 2: the result of the experiment ( a) : weak against grating spectrum and the incidence of double wavelength; ( b） : the initial time domain waveform;
( c) : the amplification of different stress conditions of the first 6 grating response spectrum; ( d) : two wavelength of reflection intensity distribution; ( e) :( d) In the result of data from subtracting
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