Miniature single-fiber photoacoustic sensor for methane gas leakage detection
Miniature single-fiber photoacoustic sensor for methane gas leakage detection
复制标题
用于甲烷气体泄漏检测的微型单光纤光声传感器
DOI：
10.1016/j.optlaseng.2021.106792
复制
发表时间：
2021-09-09
影响因子：
4.6
通讯作者：
Chen, Ke
中科院分区：
文献类型：
--
作者：
Li, Chenyang;Guo, Min;Chen, Ke
设计并提出了一种用于微量甲烷气体检测的微型单光纤光声（PA）传感器。使用法布里-珀罗 (FP) 干涉悬臂梁来监测吸收激光能量的甲烷气体产生的 PA 信号。因此，该系统中需要泵浦激光器和探测光源，并通过波分复用器（WDM）耦合，仅在一根光纤中传输。设计并优化了既用作 FP 腔又用作 PA 单元的公共腔。探讨了确定细胞尺寸背后的原理。单纤维和公共空腔导致单元体积较小，经计算仅约为1.7μL。设计实验来验证PA传感器的实用性。在 1648 Hz 谐振频率下工作时，测得实时响应时间约为 23 秒。最小可检测限 (MDL) 为 8.4 ppm，锁定积分时间为 1 秒。
A miniature single-fiber photoacoustic (PA) sensor was designed and proposed for the detection of trace amount of methane gas. A Fabry-Perot (FP) interferometric cantilever was used to monitor the PA signal generated by the methane gas having absorbed the laser energy. Therefore, a pump laser and a probe light source were required in this system and coupled by a wavelength division multiplexer (WDM) to transmit in only one fiber. A communal cavity utilized both as the FP cavity and the PA cell was designed and optimized. The principles behind the determination of the cell size were explored. The single-fiber and the communal cavity contributed to the small volume of the cell, which was calculated to be only similar to 1.7 mu L. Experiments were designed to verify the practicability of the PA sensor. Operating at the resonant frequency of 1648 Hz, the real-time response time was measured to be similar to 23 s. The minimum detectable limit (MDL) was 8.4 ppm with a 1 s lock-in integral time.