J4 ›› 2014, Vol. 27 ›› Issue (2): 53-57.doi: 10.3976/j.issn.1002-4026.2014.02.011
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CHANG Heng-Tai, CHANG Jun, LIU Yong-Ning, WANG Fu-Peng, WANG Qiang
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Abstract:
We devised a high impedance and high signal to noise ratio (SNR) preamplifier for such negatives as tuning fork output of high impedance and stronger adverse noise impact in quartz enhanced photoacoustic absorption spectrum (QEPAS). It employed a high input impedance operational amplifier and shorter signal line. Differential input and tuningforktandem were used to reduce noise and to improve signal strength. SNR was further increased. We precisely measured the resonance frequency and Q value of the tuning fork with piezoelectric ceramics directly stimulating the tuning fork. Experimental results show that the preamplifier has better stability, high SNR and low cost.
Key words: quartz enhanced photo-acoustic absorption spectrum (QEPAS), gas detection, pre-amplifier
CLC Number:
TN722
CHANG Heng-Tai, CHANG Jun, LIU Yong-Ning, WANG Fu-Peng, WANG Qiang. Application of a preamplifier in quartz enhanced photo-acoustic absorption spectrum[J].J4, 2014, 27(2): 53-57.
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