用于分布式光纤声波传感的高灵敏度抗温漂光电接收模拟前端  

High-Sensitivity Anti-Temperature Drift Photoelectric Receiving Analog Front-End for Distributed Optical Fiber Acoustic Sensing

作　　者：童晓玲[1] 谢文涛 杜尚明 梁磊[2] Tong Xiaoling;Xie Wentao;Du Shangming;Liang Lei(School of Mechanical and Electronic Engineering,Wuhan University of Technology,WuHan 430070,HuBei,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572025,Hainan,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]武汉理工大学三亚科教创新园,海南三亚572025

出　　处：《激光与光电子学进展》2024年第21期96-104,共9页Laser & Optoelectronics Progress

基　　金：海南省重大科技计划项目(ZDKJ202019);三亚崖州湾科技城管理局科研项目(SKJC-2020-01-016)。

摘　　要：为提高分布式光纤声波传感(DAS)系统对微弱后向瑞利散射光的探测能力,针对雪崩光电探测器(APD)雪崩增益温度稳定性差的问题,设计了基于APD的高灵敏度抗温度漂移光电接收模拟前端。通过测量不同温度下APD的最佳雪崩增益,并结合APD偏置电压温度自动补偿和温度控制技术,保证APD始终工作于最佳雪崩增益状态;同时针对被检测信号动态范围宽的问题,设计了对数放大电路。结果表明,该电路可以在0~50℃范围内对APD的偏置电压实现精确的温度自动补偿,偏置电压控制误差仅为0.04 V,恒温控制误差为0.14℃,对数放大电路的带宽为1 MHz,动态输入范围可达40 dB,能准确探测低至10 nW的输入光功率。This paper presents the design of a temperature-drift-resistant optoelectronic front-end for high sensitivity avalanche photodiode detectors(APD)to enhance the detection capability of weak backscattered Rayleigh light in distributed optical fiber acoustic sensing(DAS)systems and address the issue of poor avalanche gain temperature stability in APD.The optimal avalanche gain of the APD at different temperatures is measured and combined with APD bias voltage temperature auto-compensation and temperature control technology,to ensure that the APD always operates at the optimal avalanche gain state.Additionally,to address the wide dynamic range of the detected signal,a logarithmic amplification circuit is designed.Experimental results show that the circuit can achieve precise temperature autocompensation of the APD bias voltage in the range of 0‒50℃,with a bias voltage control error of only 0.04 V,temperature control error of 0.14℃,bandwidth of 1 MHz for the logarithmic amplification circuit,dynamic input range of up to 40 dB,and accurate detection of input optical power as low as 10 nW.

关 键 词：雪崩光电探测器 最佳雪崩增益 偏置电压 对数放大电路 

分 类 号：TN215[电子电信—物理电子学]