基于单片机的光纤Bragg光栅传感器的解调系统

Application of a single chip microprocessor in the optical fiber Bragg grating sensor

长期以来 ,对光纤Bragg光栅传感器反射波长的检测是采用光谱仪 ,随着光纤Bragg光栅传感器应用的不断发展 ,光谱仪表现出越来越多的局限性。本文利用调谐法布里 -珀罗腔多光束传播 ,当法布里-珀罗腔满足特定条件时其透射光可达到最强或最弱原理 ,建立了F -P腔解调系统模型 ,通过检测F-P腔的相关参数而得到所测的参变量 ;根据光纤Bragg光栅自身特性 ,建立了匹配滤波法解调系统模型 ,应用另一光纤Bragg光栅跟踪被测光纤Bragg光栅的变化 ,从而得到所测量 ;论文指出了应用时在这两种解调方案中需要解决的关键问题。为了提高系统测量的准确性和实时性 ,系统采用单片机系统处理相关数据信息。本文系统详细阐述了在解调系统中单片机的应用及相关接口模型 。

For a long time, a spectrograph is used to inspect the reflective wavelength of a fiber Bragg grating sensor. But with the wide application of the fiber Bragg grating sensor, the spectrograph gradually brings more and more limitation. The text introduces regulating the cavity length according to the principle of Fabry-Perot cavity multiple light beam transmission. When Fabry-Perot cavity meets given conditions, its transmitted light will become the strongest or weakest, thus the model of cavity demodulation system is established. And relevant variables can be obtained by checking F-P parameters. According to the characters of a fiber Bragg grating, a matching filter demodulation model is established, in which another fiber Bragg grating is used to follow the change of the measured fiber Bragg grating and then the measured parameters are obtained. The paper points out the key issues to be solved when the demodulation projects are used. To improve the accuracy and real time capability of the demodulation system, a single clip processor is used to deal with related data information of the system. Its applications in the demodulation system and related interfaces are expatiated, and the design of hardware and software are presented in detail.