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  • Received: Aug. 15, 2013

    Accepted: --

    Posted: Jan. 1, 2014

    Published Online: Jan. 2, 2014

    The Author Email: Lei Dong (donglei@sxu.edu.cn)

    DOI: 10.3788/aos201434.0130002

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    Dong Lei, Ma Weiguang, Zhang Lei, Yin Wangbao, Jia Suotang. Mid-IR Ultra-Sensitive CO Detection Based on Pulsed Quartz Enhanced Photoacoustic Spectroscopy[J]. Acta Optica Sinica, 2014, 34(1): 130002

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Acta Optica Sinica, Vol. 34, Issue 1, 130002 (2014)

Mid-IR Ultra-Sensitive CO Detection Based on Pulsed Quartz Enhanced Photoacoustic Spectroscopy

Lei Dong*, Weiguang Ma, Lei Zhang, Wangbao Yin, and Suotang Jia

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  • [in Chinese]

Abstract

An ultra-sensitive gas sensor for trace carbon monoxide (CO) detection is developed. The fundamental ro-vibrational absorption bands of CO from 2135 cm-1 to 2225 cm-1 is continuously measured using a 4.65 μm pulsed external-cavity quantum cascade laser and quartz enhanced photoacoustic spectroscopy. The water vapor, acting as a catalyst for vibrational energy transfer, is added to the targeted analyte mixture to improve signal amplitude. A detection limit of 4.6×10-8 is obtained for 3-ms lock-in amplifier time constant at atmospheric pressure with a laser scan rate of 18 cm-1/s and a 50% duty cycle, which corresponds to a normalized equivalent absorption coefficient of 1.07×10-8 cm-1W/Hz.

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