Ppb-level detection of methane based on an optimized T-type photoacoustic cell and a NIR diode laser

This paper presents an optimized T-type resonant photoacoustic (PA) cell for methane (CH(4)) gas detection. The noise transmission coefficients and PA field distributions of the T-type resonant PA cell have been evaluated using the finite element method and thermoviscous acoustic theory. The optimiz...

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Detalles Bibliográficos
Autores principales: Gong, Zhenfeng, Gao, Tianli, Mei, Liang, Chen, Ke, Chen, Yewei, Zhang, Bo, Peng, Wei, Yu, Qingxu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7771108/
https://www.ncbi.nlm.nih.gov/pubmed/33384924
http://dx.doi.org/10.1016/j.pacs.2020.100216
Descripción
Sumario:This paper presents an optimized T-type resonant photoacoustic (PA) cell for methane (CH(4)) gas detection. The noise transmission coefficients and PA field distributions of the T-type resonant PA cell have been evaluated using the finite element method and thermoviscous acoustic theory. The optimized T-type resonant PA cell, together with a near-infrared (NIR) distributed feedback (DFB) laser source, a high-speed spectrometer and a fiber-optic acoustic sensor constitutes a PAS system for CH(4) detection. The sensitivity is measured to be 1.8 pm/ppm and a minimum detectable limit (MDL) of 9 parts per billion (ppb) can be achieved with an averaging time of 500 s. The optimized T-type longitudinal resonant PA cell features of high PA cell constant, fast response time and simple manufacturing process.

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