Spectroscopy and Spectral Analysis, Volume. 40, Issue 10, 2996(2020)
Research of High Precision Photoacoustic Second Harmonic Detection Technology Based on FFT Filter
Fig. 5. Second harmonic signals and responses curves of mixed gases with different concentrauions of C2H2/N2
(a): Second harmonic signals; (b): Response curves
Fig. 6. Spectrum analysis and waveform of background noise in photoacoustic detection system
(a): Background noise spectrum;(b): Waveforms of background noise and its 0.01 Hz component
Fig. 7. Waveforms and response curves of fundamental wave components of second harmonic signals of mixed gases with different concentrations of C2H2/N2
(a): Waveforms of the fundamental components;(b): Response curves
Fig. 8. Standard deviations of photoacoustic signals before and after FFT filtering
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Liu-jie WAN, Chao ZHEN, Zong-jia QIU, Kang LI, Feng-xiang MA, Dong HAN, Guo-qiang ZHANG. Research of High Precision Photoacoustic Second Harmonic Detection Technology Based on FFT Filter[J]. Spectroscopy and Spectral Analysis, 2020, 40(10): 2996
Category: Research Articles
Received: Sep. 9, 2019
Accepted: --
Published Online: Jun. 18, 2021
The Author Email: Liu-jie WAN (wanliujie@mail.iee.ac.cn)