Zheng CHEN, Bo SUN, Lei DONG, Hongpeng WU. High Sensitive Detection of Trace Gas Based on Photoacoustic Spectroscopy via a Hammer-shaped Quartz Tuning Fork[J]. Acta Photonica Sinica, 2023, 52(3): 0352122
- Acta Photonica Sinica
- Vol. 52, Issue 3, 0352122 (2023)
Fig. 1. Schematic diagram and physical diagram of hammer tuning fork
Fig. 2. Frequency response curve of the hammer-shaped tuning fork at atmospheric pressure
Fig. 3. Schematic of the C2H2 QEPAS sensor
Fig. 4. The picture of the acoustic detection module
Fig. 5. QEPAS signals obtained at different laser focal point locations
Fig. 6. Optimization of the length of the resonator tubes
Fig. 7. C2H2-QEPAS signal amplitude with different modulation depth
Fig. 8. The second harmonic signal of 30 ppm C2H2 and the noise signal obtained in nitrogen background
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Table 1. Parameters comparison of different tuning forks
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