Highly Sensitive Optical Fiber Photoacoustic Sensor for In Situ Detection of Dissolved Gas in Oil
Highly Sensitive Optical Fiber Photoacoustic Sensor for In Situ Detection of Dissolved Gas in Oil
复制标题
用于原位检测油中溶解气体的高灵敏度光纤光声传感器
DOI：
10.1109/tim.2021.3102746
复制
发表时间：
2021-01-01
影响因子：
5.6
通讯作者：
Gong, Zhenfeng
中科院分区：
文献类型：
--
作者：
Chen, Ke;Guo, Min;Gong, Zhenfeng
提出了一种高灵敏度的光纤光声传感器，并用于油中溶解气体的现场检测。采用两根光纤分别传输泵浦光和探测光。光纤传感器与油气分离膜集成的微型检测模块使其具有无源性和抗电磁干扰的特点。油中溶解的气体通过有机膜进入PA传感器的微室。利用Fabry-Perot干涉悬臂梁检测气体吸收激光能量产生的光放大信号。为了缩短油气分离平衡时间，提高PA响应，对传感器的结构参数进行了优化。实验结果表明，温度对PA的响应时间和响应特性有影响。响应时间与50 ℃下的1.8小时相似。为了实现温度补偿，通过对测量的法布里-珀罗腔长进行平均来同时测量温度。此外，溶解乙炔（C2 H2）气体的检出限达到0.5 μ L/L。由于不需要抽油，油不与周围空气接触，因此油不会被污染和消耗，从而实现现场测量。
A highly sensitive optical fiber photoacoustic (PA) sensor was proposed and demonstrated for in situ detection of dissolved gas in oil. Two optical fibers were used for the transmission of pump light and probe light, respectively. The miniature detection module integrated by optical fiber sensor and oil-gas separation membrane made it passive and anti-electromagnetic interference. The dissolved gas in oil passed through the organic membrane into the micro-chamber of the PA sensor. The PA signal generated by the gas absorption of laser energy was detected by a Fabry-Perot interferometric cantilever. To reduce the equilibrium time of oil-gas separation and improve the PA response, structural parameters of the sensor were optimized. The experimental results showed that the temperature had an influence on the response time and PA response. The response time was similar to 1.8 h at 50 degrees C. To realize temperature compensation, the temperature was measured simultaneously by averaging the measured Fabry-Perot cavity length. In addition, the detection limit of dissolved acetylene (C2H2) gas reached 0.5 mu L/L. Since oil pumping was not required and the oil did not contact with the ambient air, the oil was not polluted and consumed to achieve in situ measurement.