Harmonic Phase-sensitive Detection for Quartz-enhanced Photoacoustic-thermoelastic Spectroscopy

Overview

Journal Photoacoustics

Date 2024 Aug 6

PMID 39104762

Authors

Mengpeng Hu

Dongqing Zhang

Hui Zhang

Yu Liu

Weibiao Wang

Qiang Wang

Affiliations

Soon will be listed here.

Abstract

Quartz tuning fork (QTF)-based techniques of photoacoustic spectroscopy and thermoelastic spectroscopy play a significant role in trace gas sensing due to unique high sensitivity and compactness. However, the stability of both techniques remains plagued by the inevitable and unpredictable laser power variation and demodulation phase variation. Herein, we investigate the phase change of a QTF when integrating both techniques for enhanced gas sensing. By demonstrating harmonic phase-sensitive methane detection as an example, we achieve stable gas measurement at varying laser power (2.4-9.4 mW) and varying demodulation phase (-90-90°). Besides, this method shows more tolerance to resonant frequency drift, contributing to a small signal fluctuation of ≤ 6.4 % over a wide modulation range (>10 times of the QTF bandwidth). The realization of harmonic-phase detection allows strengthening the stability of QTF-based sensors in a simple manner, especially when stable parameters, such as laser power, demodulation phase, even resonant frequency, cannot always be maintained.

Citing Articles

Improved T-shaped quartz tuning fork with isosceles-trapezoidal grooves optimized for quartz-enhanced photoacoustic spectroscopy.

Fang F, Wang R, Shao D, Wang Y, Tao Y, Lin S Photoacoustics. 2024; 41:100672.

PMID: 39697431 PMC: 11652942. DOI: 10.1016/j.pacs.2024.100672.

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