基于低增益低噪声光纤腔衰荡技术的湿度测量方法

王芳; 杨亚萍; 王旭; 刘玉芳

doi:doi:10.3788/gzxb20184703.0306001

光子学报, 2018, 47 (3): 0306001, 网络出版: 2018-02-01

基于低增益低噪声光纤腔衰荡技术的湿度测量方法

Humidity Measurement Based on Low Gain and Low Noise Fiber Cavity Ring-down Spectroscopy

论文大纲

王芳 ^*杨亚萍王旭刘玉芳

作者单位

河南师范大学电子与电气工程学院, 河南新乡 453007

光纤腔衰荡低增益低噪声掺铒光纤放大器气体室湿度测量 Fiber cavity ring-down Low gain and low noise Erbium-doped fiber amplifier Gas cell Humidity measurement

摘要

提出了一种基于腔内带有低增益低噪声掺铒光纤放大器的光纤环形腔衰荡光谱技术测量湿度的方法, 并进行了实验证明.比较分析了光纤环形腔中有无掺铒光纤放大器对衰荡脉冲数量的影响.在掺铒光纤放大器中使用长度为2 m的低增益和低噪声掺铒光纤来减少波形失真并补偿腔内噪声衰减.利用光纤环腔衰荡光谱技术对空气相对湿度进行测量, 记录分析环形腔中光脉冲的衰减时间τ得到相对湿度的变化.结果表明: 相对湿度和衰减时间τ在相对湿度30%~100%的范围内满足良好的线性关系, 并且光纤环腔衰荡系统的灵敏度和线性拟合度分别为3.826 79 μs/RH和0.994 77.采用腔内带有低增益低噪声掺铒光纤放大器的光纤腔衰荡技术在工业检测、环境检测以及医学诊断等领域进行湿度测量将具有良好的应用前景.

Abstract

A humidity measurement method based on a fiber loop cavity ring-down spectroscopy system with low gain and low noise erbium-doped fiber amplifier is proposed and experimentally demonstrated. The influence of an erbium-doped fiber amplifier placed inside and outside the fiber ring on the pulse curve and the number of pulse peaks in the annular cavity is analyzed. A length of 2 m low-gain and low-noise erbium-doped fiber in an erbium-doped fiber amplifier is used to reduce waveform distortion and compensate for the noise attenuation of the cavity. Measurement of relation humidity is performed with the fiber loop cavity ring-down spectroscopy system, and the change of relation humidity is gained by recording the ring-down time τ of light pulse in the fiber loop. Results indicate that a good linear relationship is met between relation humidity and τ in the range of 30% to 100%. The sensitivity and accuracy of the fiber loop cavity ring-down spectroscopy system are 3.826 79 μs/RH and 0.994 77 respectively. So it can be employed for the fields of industrial detection, environmental inspection and medical diagnosis.

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王芳, 杨亚萍, 王旭, 刘玉芳. 基于低增益低噪声光纤腔衰荡技术的湿度测量方法[J]. 光子学报, 2018, 47(3): 0306001. WANG Fang, YANG Ya-ping, WANG Xu, LIU Yu-fang. Humidity Measurement Based on Low Gain and Low Noise Fiber Cavity Ring-down Spectroscopy[J]. ACTA PHOTONICA SINICA, 2018, 47(3): 0306001.

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