Abstract
A new optical detection approach based on quartz-enhanced photoacoustic spectroscopy (QEPAS) to detect gases is developed. The new method not only employs a modulated laser to excite acoustic wave, as the general QEPAS does, but also adds an extra laser beam without modulation as the detection source to transform the prong vibration into a laser intensity change. Due to the mechanical vibration of the prongs, the intensity of the reflection laser beam is modulated. Thus, the information of the target gas (composition, concentration, etc.) is obtained by demodulating the reflected light. The achieved sensitivity of \(1.13\times 10^{-6}\,\mathrm{cm}^{-1}{\cdot } \mathrm{W}{\cdot } \mathrm{Hz}^{-1/2}\) is inter-compared to the sensitivity of the conventional QEPAS. Further developments of the new optical detection approach are also discussed in detail.
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Acknowledgments
The authors gratefully acknowledge financial support from the 973 Program (Grant No. 2012CB921603), National Natural Science Foundation of China (Grant Nos. 61127017, 61178009, 61108030, 61378047, 61275213, and 61205216), the National Key Technology R&D Program (2013BAC14B01), the Shanxi Natural Science Foundation (Grant Nos. 2013021004-1 and 2012021022-1), the Shanxi Patent Promotion and Implementation Project, the National Science Foundation for Fostering Talents in Basic Research of the National (J1210036, J1103210), and the Shanxi Scholarship Council of China (2013-011, 2013-01).
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Wu, H., Zhang, D., Dong, L. et al. Optical Detection Technique Using Quartz-Enhanced Photoacoustic Spectrum. Int J Thermophys 36, 1297–1304 (2015). https://doi.org/10.1007/s10765-014-1694-1
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DOI: https://doi.org/10.1007/s10765-014-1694-1