The SNR improvement for quartz-enhanced photoacoustic spectroscopy using wavelength calibration and fiber reflector |
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| Authors: | Z. L. Wang C. W. Tian Q. Liu J. Chang Q. D. Zhang |
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| Affiliation: | 1.School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology,Liaocheng University,Liaocheng,China;2.School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application,Shandong University,Jinan,China |
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| Abstract: | Wavelength calibration technique combined with a fiber reflector was used to improve the signal to noise ratio (SNR) of quartz-enhanced photoacoustic spectroscopy (QEPAS). A distributed feedback laser diode (DFB-LD), driven by sawtooth wave and high frequency sinusoidal wave, was used to excite the second harmonic signal of a quartz tuning fork (QTF) through laser-gas molecular interaction. Two collimators conducted the laser alignment through the spacing gap of QTF forks. Central wavelength of the DFB-LD was locked to the target gas absorption center by identifying the second harmonic signal maximum and applying calibration feedback on the driving current. The gas absorption center calibration and gas concentration measurements are conducted at a specific interval. The SNR of the photoacoustic signal was further acoustically enhanced by using a pair of on-beam acoustic resonators through increasing the photo-acoustic conversion efficient, and optically enhanced by using a fiber reflector to improve the laser power for photoacoustic signal excitation. The experimental results show that the SNR in wavelength calibration mode is 15 times higher than the conventional wavelength scanning mode and QEPAS signal with fiber reflector is 1.37 times stronger compared with that without a fiber reflector. |
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