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Title: NIR diode laser-based QEPAS for acetylene detection
Authors: Cao, Y
Jin, W 
Hoi, HL
Keywords: Diodes
Near infrared
Amplitude modulation
Semiconductor lasers
Signal detection
Issue Date: 2012
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2012, v. 8439, 843928 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: Quartz-enhanced photoacoustic spectroscopy with a near infrared distributed feedback diode laser at 1.53 μm is demonstrated for acetylene detection at atmospheric pressure and room temperature. The P(9) absorption line in the ν1+ν3 band of C2H2 is selected for light absorption and photoacoustic pressure wave excitation. A pair of resonant tubes with optimal dimensions is used in combination with a quartz tuning fork for photoacoustic signal enhancement. The wavelength of diode laser is modulated at half of the resonant frequency of tuning fork for second harmonic signal detection. The effect of residual amplitude modulation is theoretically analyzed and compared with the experimental results. A noise-limited minimum detectable concentration (1σ) of 2 part-per-million (ppm) is achieved with a 7-mW laser power and a 1-s lock-in time constant, corresponding to a normalized noise equivalent absorption coefficient of 5.4×10-8 cm-1 W/√Hz.
Description: Conference on Optical Sensing and Detection II, Brussels, Belgium, 16 April 2012
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.922625
Appears in Collections:Conference Paper

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