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Indexed by:
Journal paper
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Document Code:
100353
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First Author:
Hanping Xiao,Jinbiao Zhao
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Correspondence Author:
Lu Ping,Chaotan SIMA
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Co-author:
ZHANG JIANG SHAN,LIU DE MING
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Journal:
Photoacoustics
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Included Journals:
SCI、EI
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Discipline:
Engineering
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First-Level Discipline:
Other specialties in Optical Engineering
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Document Type:
J
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Volume:
26
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ISSN No.:
2213-5979
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Key Words:
Infrared; Photoacoustic spectroscopy; Fiber-optic microphone; Gas detection
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DOI number:
10.1016/j.pacs.2022.100353
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Date of Publication:
2022-04-01
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Impact Factor:
8.484
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Abstract:
In this paper, we propose and experimentally demonstrate an ultra-sensitive all-optical PAS gas sensor, incorporating with a near-infrared (NIR) diode laser, novel fiber-optic microphones (FOMs) and a double channel differential T-type photoacoustic cell. The fiber-optic microphoneFOM is realized by Fabry-Perot (FP) interferometry and novel gold-chromium (Au-Cr) composite nanomem-branes. To meet the demand of high sensitivity and flat frequency response for FOMs, the Au-Cr composite diaphragm is proposed anddeliberately designed by the diaphragm forced vibration principle and fabricated by E-beam evaporation deposition with 330 nm in thickness and 6.35 mm in radius. Experimental results show that the optical microphoneFOM has a sensitivity of about 30 V/Pa and a flat frequency response from 300 to 900 Hz with fluctuation below 1 dB. Moreover, a double channel differential T-type pho-toacoustic cell is designed and employed in the all-optical PAS gas sensor, with the first-order resonant frequency of 610 Hz. The all-optical gas sensor is established and verified for CH4 detection and the normalized noise equivalent absorption (NNEA) is 4.42×10-10 W∙cm-1∙Hz-1/2, which shows optimum among previously reported optical PAS methane sensors so far. The minimum de-tection limit (MDL) of 36.45 ppb is achieved with a 1 s integration time. The MDL could be further enhanced to 4.87 ppb with an integration time of 81 s, allowing ultra-sensitive trace gas detection
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Links to published journals:
