Spectroscopy and Spectral Analysis, Volume. 40, Issue 10, 2996(2020)

Research of High Precision Photoacoustic Second Harmonic Detection Technology Based on FFT Filter

Liu-jie WAN1,1、*, Chao ZHEN1,1, Zong-jia QIU1,1, Kang LI1,1, Feng-xiang MA1,1, Dong HAN1,1, and Guo-qiang ZHANG1,1
Author Affiliations
  • 1[in Chinese]
  • 11. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
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    Figures & Tables(10)
    Schematic diagram of photoacoustic detection system
    Frequency domain simulation of photoacoustic cell
    Frequency response curve of optoacoustic cell
    Signal value under different modulation voltage
    Second harmonic signals and responses curves of mixed gases with different concentrauions of C2H2/N2(a): Second harmonic signals; (b): Response curves
    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
    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
    Standard deviations of photoacoustic signals before and after FFT filtering
    • Table 1. The maximum value and standard deviation of photoacoustic second harmonic signals at different concentrations of C2H2/N2

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      Table 1. The maximum value and standard deviation of photoacoustic second harmonic signals at different concentrations of C2H2/N2

      浓度/(μL·L-1)A2max/μV标准偏差/μV
      10.380.030
      7.72.620.026
      15.35.080.051
      30.39.250.019
      5014.430.142
      75.124.790.119
      10229.780.066
    • Table 2. The fundamental amplitude of photoacoustic second harmonic signals at different concentrations of C2H2/N2

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      Table 2. The fundamental amplitude of photoacoustic second harmonic signals at different concentrations of C2H2/N2

      浓度/
      (μL·L-1)
      A2(1 m)/
      μV
      浓度/
      (μL·L-1)
      A2(1 m)/
      μV
      0.170.009 815.31.157
      0.350.022 630.33.123
      0.570.041 8504.876
      0.790.051 575.18.092
      10.074 41029.702
      7.70.854 8
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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

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    Paper Information

    Category: Research Articles

    Received: Sep. 9, 2019

    Accepted: --

    Published Online: Jun. 18, 2021

    The Author Email: Liu-jie WAN (wanliujie@mail.iee.ac.cn)

    DOI:10.3964/j.issn.1000-0593(2020)10-2996-06

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