Design and Experimental Research on Two Channel Quartz-Enhanced Photoacoustic Spectroscopy Spectrophone

Abstract

Abstract:

Acoustic detection sensor system based on quartz-enhanced photoacoustic spectroscopy (QEPAS) with double acousticmicro-resonators (AmR) is developed. The experiment for detection of H2O and CO2 was carried out to evaluate the sensitivity and stability of the system. The results show that the noise characteristics of the double AmR configuration still agree with the single AmR configuration. The double AmRs spectrophone configuration exhibits a strong acoustic coupling between the AmRs and the quartz tuning fork, which results in about 5 ms fast response time. The normalized noise equivalent absorption coefficients (NNEAs) of the top and bottom channels are 7.8*10-9 cm-1W/√Hz and 8.1*10-9 cm-1W/√Hz, respectively. Moreover, the double AmRs provide two independent detection channels that allow optical signal addition or cancellation from different optical wavelengths and facilitate rapid multigas sensing measurements.

Key words: quartz tuning fork, photoacoustic spectroscopy, double acoustic microresonator, fast response time, gas sensor

CLC Number:

WU Hongpeng,DONG Lei,ZHENG Huadan,LIU Yanyan,LIU Xiaoli,YIN Xukun,MA Weiguang,. Design and Experimental Research on Two Channel Quartz-Enhanced Photoacoustic Spectroscopy Spectrophone[J]. Journal of Atmospheric and Environmental Optics, 2016, 11(1): 37-43.

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