基于窄线宽扫频光源的高分辨率阵列式光纤光栅温度传感系统  

High-Resolution Array Fiber Grating Temperature Sensing System Based on Narrow Linewidth Swept Light Source

作　　者：陈伟 刘庆文 常晏铭 刘姝廷 何祖源 Chen Wei;Liu Qingwen;Chang Yanming;Liu Shuting;He Zuyuan(State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China;Pengcheng Laboratory,Shenzhen 518055,Guangdong,China)

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240 [2]鹏城实验室,广东深圳518055

出　　处：《光学学报》2023年第9期24-30,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62175147,61975116)。

摘　　要：高精度温度传感器在地球物理、海洋科学、石油化工等领域具有广泛应用。针对传统光纤光栅温度传感器分辨率较低的问题,提出一种基于光纤光栅的高精度多点复用温度传感系统,该系统采用封装好的不同中心波长的π相移光纤光栅作为温度敏感单元,以扫频激光器和波分复用技术检测各光纤光栅谐振波长,并引入氰化氢标准气体吸收室作为波长参考,用非平衡马赫-曾德尔干涉仪补偿光源扫频过程中的非线性,以提升波长测量精度。实验实现了对10个温度传感探头的同时探测,温度分辨率达到10^(-4)℃水平,测量范围达到0~100℃。该光纤光栅温度传感系统在高精度温度测量领域具有广阔的应用前景。Objective In geophysical,marine science,oil and gas well detection,aircraft structure health monitoring,and other application scenarios,the sensor is required to have small size,high resolution,and robust against harsh environments and electromagnetic interference.Especially in underground and deep-sea observation scenarios,the temperature sensor should be equipped with remote monitoring ability and temperature resolution of milli Celsius level.In these scenarios,electronic temperature sensors are difficult to meet the requirements due to their limitations,and fiber grating-based temperature sensors have the advantages of high resolution,large dynamic measurement range,and multiplexing sensing capability.This paper proposes a high-resolution multiplexed temperature sensing system based on optical fiber grating,which adopts the phase-shifted fiber Bragg gratings with different center wavelengths utilizing wavelength division multiplexing technology as the temperature sensing unit.The resonant wavelength of each optical fiber grating is detected by sweeping laser wavelength,and a hydrogen cyanide absorption chamber is introduced as the wavelength reference.An unbalanced Mach-Zehnder interferometer is employed to compensate for the nonlinearity in the wavelength sweeping of the laser to improve the wavelength measurement accuracy.In the experiment,the simultaneous detection of ten temperature sensing heads is achieved with a temperature resolution of 10-4℃and measurement range of 0-100℃.This fiber grating temperature sensing system has a broad application prospect in the fields which require high-resolution temperature measurement.Methods This study puts forward a high-precision multiplexed temperature sensing system based on fiber grating.The swept laser is divided into four paths after the coupler.The first path is the probe light for sensor heads,which enters the sensing grating array by wavelength division multiplexer.The second path is directly connected to the detector,which is utilized to compensate for t

关 键 词：光纤光学 高精度温度传感 扫频激光 相移光纤光栅 光纤光栅封装 光纤光栅阵列 

分 类 号：TN929.11[电子电信—通信与信息系统]