Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21974
Title: Acetylene detection based on diode laser QEPAS : combined wavelength and residual amplitude modulation
Authors: Cao, Y
Jin, W 
Ho, HL
Qi, L
Yang, YH
Issue Date: 2012
Publisher: Springer
Source: Applied physics. B, Lasers and optics, 2012, v. 109, no. 2, p. 359-366 How to cite?
Journal: Applied physics. B, Lasers and optics 
Abstract: Quartz-enhanced photoacoustic spectroscopy (QEPAS) is demonstrated for acetylene detection at atmospheric pressure and room temperature with a fiber-coupled distributed feedback (DFB) diode laser operating at ~1.53 μm. An efficient approach for gas concentration calibration is demonstrated. The effect of residual amplitude modulation on the performance of wavelength modulated QEPAS is investigated theoretically and experimentally. With optimized spectrophone parameters and modulation depth, a minimum detectable limit (1σ) of ~2 part-per-million volume (ppmv) was achieved with an 8.44-mW diode laser, which corresponds to a normalized noise equivalent coefficient (1σ) of 6.16 × 10-8 cm-1 W/Hz1/2.
URI: http://hdl.handle.net/10397/21974
ISSN: 0946-2171
EISSN: 1432-0649
DOI: 10.1007/s00340-012-5221-4
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