Chen Ke, Yang Beilei, Guo Min, Deng Hong, Zhang Bo, Liu Shuai, Li Chenyang, An Ran, Peng Wei, Yu Qingxu
Opt Lett. 2020 Apr 15;45(8):2458-2461. doi: 10.1364/OL.390898.
A high-precision fiber-optic photoacoustic (PA) gas sensor with temperature self-compensation is reported. The target gas diffuses into a micro-chamber and absorbs the laser energy to generate a PA signal, which is detected by a Fabry-Perot interferometric cantilever. The temperature affects not only the acoustic sensitivity of the cantilever, but also the PA conversion efficiency. The test result of the PA frequency response demonstrates that there is a temperature-insensitive operating frequency of 1208.4 Hz in the range of 0-80°C. The temperature self-compensated measurement was realized by setting the laser modulation frequency to 604.2 Hz and using the second-harmonic detection technique.
报道了一种具有温度自补偿功能的高精度光纤光声（PA）气体传感器。目标气体扩散到微腔中并吸收激光能量以产生光声信号，该信号由法布里-珀罗干涉式悬臂梁检测。温度不仅影响悬臂梁的声学灵敏度，还影响光声转换效率。光声频率响应的测试结果表明，在0-80°C范围内存在一个对温度不敏感的工作频率1208.4 Hz。通过将激光调制频率设置为604.2 Hz并使用二次谐波检测技术实现了温度自补偿测量。
