Miniaturized anti-interference cantilever-enhanced fiber-optic photoacoustic methane sensor

Fiber-Optic Photoacoustic Gas Sensor with Multiplexed Fabry–Pérot Interferometric Cantilevers

“…As shown in Figure , there is a signal peak at 2680 Hz, where it corresponds to the resonance frequency of dual FOICMs. Furthermore, the gas diffusion hole is similar to a low-pass filter for the PA signal. , The energy of the low-frequency signal in the PA tube will leak through the hole, while the high-frequency PA signal is concentrated. Meanwhile, it is difficult for the high-frequency noise in the environment to couple into the PA tube owing to the obstruction of the hole.…”

Multi-mechanism collaboration enhanced photoacoustic analyzer for trace H2S detection

“…The non-radiative transition of gas molecules releases part of the absorbed light energy in the form of heat [11] . When the excitation source is modulated, periodic thermal expansion of the gas produces photoacoustic signals [12] , [13] . The concentration of the target gas can be obtained by measuring the photoacoustic signals through acoustic sensors [14] , [15] , [16] .…”

Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

“…The commonly used detection techniques for dissolved C 2 H 2 include gas chromatography 8,9 and semiconductor sensing method. 10,11 These methods generally have the shortcomings such as low sensitivity, crossinterference, short life, and long response time. [12][13][14] Compared with these non-optical measurement methods, optical measurement methods based on the Lambert-Beer law have significant advantages such as quick response and high sensitivity.…”