Dong Lei, Wu Hongpeng, Zheng Huadan, Yin Xukun, Ma Weiguang, Zhang Lei, Yin Wangbao, Xiao Liantuan, Jia Suotang. Recent Progress in Quartz-Enhanced Photoacoustic Spectroscopy[J]. Chinese Journal of Lasers, 2018, 45(9): 911004
- Chinese Journal of Lasers
- Vol. 45, Issue 9, 911004 (2018)
Fig. 1. Commercially available standard quartz tuning forks with a resonant frequency of 32 kHz
![QEPAS spectrophones with (a) on-beam and (b) off-beam configurations[17]](/richHtml/zgjg/2018/45/9/0911004/img_2.jpg)
Fig. 2. QEPAS spectrophones with (a) on-beam and (b) off-beam configurations[17]
Fig. 3. Quartz enhanced photoacoustic detection module for mid-infrared region. (a) CAD model; (b) prototype
Fig. 4. Typical quartz-enhanced photoacoustic spectroscopic sensor system
Fig. 5. Principle of modulation cancellation method and experimental setup[45]
Fig. 6. (a) BF-QEPAS principle; (b) waveforms of scanning, piezoelectric and beat frequency signals[49]
Fig. 7. QEPAS spectrophone based on two QTFs[13]
Fig. 8. (a) Configuration #1 of QEPAS spectrophone based on two QTFs; (b) configuration #2 of QEPAS spectrophone based on two QTFs[13]
Fig. 9. Schematic of double acoustic micro-resonator spectrophone[25]
Fig. 10. Schematic of the I-QEPAS optical path configuration[53]
Fig. 11. Schematic of the evanescent wave QEPAS configuration[56]
Fig. 12. (a) Definition of length (Lp), width (W), and thickness (T) of tuning fork arm; (b) size comparison of the standard and the 6 customized quartz tuning forks[59]
Fig. 13. Pressure distributions in acoustic resonator with (a) a large and (b) a small gaps in the middle[61]
Fig. 14. Schematic of single-tube on-beam QEPAS spectrophone[62]
Fig. 15. Single-tube on-beam QEPAS spectrophone operating in overtone resonant mode[64]
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Table 1. Parameters of standard and 6 customized tuning forks
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