Acta Optica Sinica, Volume. 34, Issue 1, 130002(2014)
Mid-IR Ultra-Sensitive CO Detection Based on Pulsed Quartz Enhanced Photoacoustic Spectroscopy
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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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
Category: Spectroscopy
Received: Aug. 15, 2013
Accepted: --
Published Online: Jan. 2, 2014
The Author Email: Lei Dong (donglei@sxu.edu.cn)