Multi-mechanism Collaboration Enhanced Photoacoustic Analyzer for Trace HS Detection

Overview

Journal Photoacoustics

Date 2023 Jan 19

PMID 36654963

Authors

Min Guo

Xinyu Zhao

Ke Chen

Dongyu Cui

Guangyin Zhang

Chenxi Li

Zhenfeng Gong

Qingxu Yu

Affiliations

Soon will be listed here.

Abstract

To realize the real-time highly sensitive detection of SF decomposition product HS, a multi-mechanism collaboration enhancement photoacoustic spectroscopy analyzer (MCEPA) based on acoustic resonance enhancement, cantilever enhancement and excitation light enhancement is proposed. An SF background gas-induced photoacoustic cell (PAC) was used for acoustic resonance (AR) enhancement of the photoacoustic signals. A fiber-optic acoustic sensor based on a silicon cantilever is optimized and fabricated. The narrow-band acoustic signal enhancement based on cantilever mechanical resonance (MR) is realized in the optimal working frequency band of the PAC. A fiber-coupled DFB cascaded an Erbium-doped fiber amplifier (EDFA) realized the light power enhancement (LPE) of the photoacoustic signals excitation source. Experimental results show that the MR of the fiber-optic silicon cantilever acoustic sensor (FSCAS) is matched with the AR of the PAC and combined with the LPE, which realizes the multi-mechanism collaboration enhancement of weak photoacoustic signals. The Allan-Werle deviation evaluation showed that the minimum detection limit of HS in the SF background is 10.96 ppb when the average time is 200 s. Benefiting from the all-optimization of photoacoustic excitation and detection, the MCEPA has near-field high-sensitivity gas detection capability immune to electromagnetic interference.

Citing Articles

Multiple optical path length reflections enhancement based on balloon-type photoacoustic cell for trace gas sensing.

Wu R, Ni W, Yang C, He B, Lu P, Ran S Photoacoustics. 2025; 41():100681.

PMID: 39811064 PMC: 11731772. DOI: 10.1016/j.pacs.2024.100681.

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