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2m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 79μs/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.
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 mlow-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 timeτ of light pulse in the fiber loop.Results indicate that a good linear relationship is met between relation humidity andτin the range of 30% to 100%.The sensitivity and accuracy of the fiber loop cavity ring-down spectroscopy system are 3.826 79μs/RH and 0.994 77 respectively.So it can be employed for the fields of industrial detection,environmental inspection and medical diagnosis.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2018年第3期164-169,共6页
Acta Photonica Sinica
基金
国家自然科学基金(No.61475043)
河南省高等学校重点科研项目计划(No.14B510014)
河南师范大学资助项目(No.201310476046)资助~~
关键词
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
