光纤法布里-珀罗传感解调中信号非线性失真的影响研究  

Research on Nonlinear Distortion Effect in the Space Scanning Optical Fiber Fabry-Perot Sensor Demodulation System

作　　者：曹潇[1] 王双[1] 刘琨[1] 刘铁根[1] 邹盛亮[1] 石俊锋 

机构地区：[1]天津大学精密仪器与光电子工程学院光纤传感研究所光电信息技术教育部重点实验室,天津300072

出　　处：《激光与光电子学进展》2016年第4期26-33,共8页Laser & Optoelectronics Progress

基　　金：国家重大科学仪器设备开发专项(2013YQ030915);国家973计划(2010CB327802);国家自然科学基金(61227011;61378043;61475114;61505139);教育部科学技术研究重大项目(313038);天津市自然科学基金(13JCYBJC16200);深圳市科技创新委员会(JCYJ20120831153904083);光电信息技术教育部重点实验室开放基金(2014KFKT021)

摘　　要：研究了光纤法布里-珀罗（F-P）传感解调中CCD非线性失真及其对解调的影响。测试CCD响应特性并建立拟合模型,仿真分析了不同噪声下的非线性失真影响。结果显示解调出的绝对相位标准差随着非线性失真率的增大而逐渐增大;且随着噪声增加,产生解调干涉级次跳变的非线性失真率减小。利用搭建的光纤F-P压力传感系统研究了信号非线性失真的影响。实验结果表明固定压力下的非线性失真率随着光功率的增加而增加,非线性失真率大于26.3%后会出现解调干涉级次跳变,实验与仿真结果一致。非线性失真率在0.3%～22.3%范围内的满量程压力解调结果显示,随着非线性失真率的增大,解调精度逐渐降低。非线性失真率为22.3%时解调最大误差为0.215 kPa,相比非线性失真率为0.3%时增大了1.24倍。要保证满量程范围内解调精度优于0.04%,非线性失真率应小于6.7%。For the space scanning optical fiber Fabry-Perot（F-P） sensor demodulation system, the nonlinear distortion of CCD and its influence on absolute phase demodulation are investigated. The CCD response characteristic is measured and a fitting model is built. Then, the influence of nonlinear distortion under different standard deviation of noise is simulated. The simulation results show that the standard deviation of the demodulated absolute phase increases with the increase of the nonlinear distortion rate. Meanwhile, interference order jump error resulting from the nonlinear distortion rate decreases with the increase of noise. The influence of nonlinear distortion is studied based on the optical fiber F-P pressure sensor demodulation system. The experimental results show that the nonlinear distortion rate under a fixed pressure increases with the optical power, and the interference order jump error appears when the nonlinear distortion rate is larger than 26.3%, which agrees with the simulation results. In addition, the demodulation accuracy decreases with the increase of the nonlinear distortion rate when the nonlinear distortion rate of fiber F-P full pressure sensing demodulation ranges from 0.3% to 22.3%. The demodulation error is 0.215 k Pa when the nonlinear distortion rate is 22.3%, which has increased by 1.24 times as compared with that when the nonlinear distortion rate is 0.3%. In order to ensure the demodulation accuracy better than 0.04% in full scale, the nonlinear distortion rate should be controlled less than 6.7%.

关 键 词：探测器 光纤法布里-珀罗传感器 非线性失真 解调精度 

分 类 号：TN29[电子电信—物理电子学]