基于取样环的APD增益调节与温度校正拉曼光纤传感系统  

Sample-Ring Based APD Gain Adjusting and Temperature Calibrating Raman Fiber Sensing System

作　　者：余超群[1] 陈福昌[1] 张华林[1] 周锦荣[1] 

机构地区：[1]闽南师范大学物理与信息工程学院,福建漳州363000

出　　处：《激光与光电子学进展》2015年第9期79-85,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61405086);福建省教育厅A类(JA14207);漳州市自然科学基金(ZZ2013J02);闽南师范大学新世纪人才(MX13003);闽南师范大学杰出青年计划(SJ12001)

摘　　要：提出并实验验证了一种基于取样环的雪崩光电二极管(APD)增益调节与温度校正拉曼光纤温度传感系统,通过比较取样环在测温线与基线上的信号偏差对APD进行偏压调节,维持APD增益基本恒定,保证系统信噪比和稳定性;并在此基础上针对环境变化等不确定因素造成的不可避免的APD增益波动,以该取样环信号为参考信号对测温曲线进行校正解调,进一步提升系统测温精度。实验证明,较之传统的拉曼光纤温度传感系统,这种基于取样环的APD增益调节和温度校正方案能有效消除APD增益变化对传感系统的影响,显著提升系统在信噪比、稳定性和测温精确性等方面的性能,具有实用价值。A Raman fiber temperature sensing system based on sample-ring aualanche photo diode （APD） gain adjusting and temperature calibrating method is proposed and experimentally demonstrated. The proposed system controls the APD bias by comparing the deviation of signal line and baseline obtained from the sample-ring, maintaining a substantially constant APD gain, thus ensuring temperature measurement accuracy and signal to noise ratio. Signal line obtained from the sample-ring is also used as reference signal for temperature calibration, further eliminating measured errors caused by inevitable APD gain fluctuation due to uncertain factors. Experimental results show that the proposed method significantly improves system performs in signal to noise ratio, stability and temperature measurement accuracy with respect to conventional Raman fiber temperature sensing system, it has practical value.

关 键 词：测量 拉曼散射 光纤传感 取样环 

分 类 号：TN247[电子电信—物理电子学] TP212.1[自动化与计算机技术—检测技术与自动化装置]