Multi-mechanism enhanced photoacoustic spectroscopy H2S analyzer based on ultrasensitive fiber-optic acoustic sensor

Abstract

To realize the highly sensitive detection of trace H2S in SF6, a multi-mechanism enhanced photoacoustic spectroscopy analyzer (MEPSA) is proposed. A resonant photoacoustic cell (PAC) is used to enhance the photoacoustic signals. An ultrasensitive optical fiber acoustic sensor based on a silicon cantilever beam is used for mechanical resonance enhancement of photoacoustic signals. An Erbium-doped fiber application amplifier (EDFA) was used to cascade a DFB to increase the excitation light power. The noise equivalent minimum detection limit of H2S under the SF6 background is 0.15 ppm.

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

“…laser modulation current. 42,43 By utilizing the optimal modulation current parameters, the detection sensitivity to C 2 H 2 gas can be effectively improved. The sinusoidal modulation current of the DFB laser was gradually increased from 0.5 to 8 mA.…”