FP传感器双峰级次腔长解调算法  

Peak-to-peak and interference order cavity length demodulation algorithm for FP sensors

作　　者：陈斯彤 王伟[1,2] 周立凡[3] 王东平 徐郁盛 张雄星 CHEN Sitong;WANG Wei;ZHOU Lifan;WANG Dongping;XU Yusheng;ZHANG Xiongxing(School of Optoelectronics Engineering,Xi′an Technological University,Shaanxi 710021,China;School of Defense Science and Technology,Xi′an Technological University,Shaanxi 710021,China;SEC Research Institute Co.Ltd,Shaanxi 710021,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021 [2]西安工业大学兵器科学与技术学院,陕西西安710021 [3]陕西电子信息研究院有限公司,陕西西安710071

出　　处：《光电子．激光》2024年第2期128-134,共7页Journal of Optoelectronics·Laser

基　　金：陕西省自然科学基础研究计划项目(2021JM-438);激光与物质相互作用国家重点实验室开放基础研究课题(SKLLIM2007)资助项目。

摘　　要：在应用双峰法解调光纤法布里-珀罗(Fabry-Perot, FP)传感器时,由于难以准确判断干涉级次,而导致解调腔长误差明显过大。为了应对这种问题,提出一种双峰级次腔长解调算法。该算法通过跟踪传感器反射光谱中相距最远的两个波峰准确判断出所选波峰的干涉级次,然后根据单峰法精确解算出绝对腔长。由于有效消除了双峰法的干涉级次模糊,腔长解算精度显著提高。对腔长30—100μm的FP传感器进行了仿真分析和验证实验。仿真解调误差小于0.7 nm,实验误差小于1.4 nm,解调误差远小于双峰法。To solve the problem of the excessive cavity length demodulation error caused by the inability to determine the interference order due to the peak-to-peak method of demodulating the fiber-optic Fabry-Perot(FP) sensor.A peak-to-peak and interference order cavity length demodulation algorithm is proposed.The algorithm accurately determines the interference order of the selected peak by tracking the two farthest peaks in the reflection spectrum of the sensor, and then accurately solves the absolute cavity length according to the single-peak method.The accuracy of the cavity length solution is significantly improved by effectively eliminating the ambiguity of the interference order of the peak-to-peak method. Simulation analysis and experimental verification are carried out for FP sensors with cavity lengths of 30—100 μm.The simulated demodulation error is less than 0.7 nm, the experimental error is less than 1.4 nm, and the demodulation error is much smaller than that of the peak-to-peak method.

关 键 词：光纤传感器 法布里-珀罗(FP)腔 双峰法 干涉级次 腔长解调 

分 类 号：TN253[电子电信—物理电子学]