Acetylene detection based on diode laser QEPAS: combined wavelength and residual amplitude modulation
Acetylene detection based on diode laser QEPAS: combined wavelength and residual amplitude modulation
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DOI：
10.1007/s00340-012-5221-4
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发表时间：
2012-11-01
影响因子：
2.1
通讯作者：
Yang, Y. H.
中科院分区：
文献类型：
--
作者：
Cao, Y.;Jin, W.;Yang, Y. H.
利用光纤耦合分布式反馈（DFB）二极管激光器，证明了石英增强光声光谱（QEPAS）可用于常压和室温下的乙炔检测，并证明了一种有效的气体浓度校准方法。从理论上和实验上研究了残余调幅对波长调制QEPAS性能的影响。通过优化的声谱仪参数和调制深度，用8.44 mw二极管激光器实现了类似于百万分之2体积（ppmv）的最小可检测极限（1西格玛），对应于归一化噪声等效系数（1西格玛）为6.16 x 10(-8) cm(-1) W/Hz（1/2）。
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 similar to 1.53 mu m. 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 (1 sigma) of similar to 2 part-per-million volume (ppmv) was achieved with an 8.44-mW diode laser, which corresponds to a normalized noise equivalent coefficient (1 sigma) of 6.16 x 10(-8) cm(-1) W/Hz(1/2).