Infrared and Laser Engineering, Volume. 52, Issue 10, 20230023(2023)

Digital lock-in amplifier controlled by FPGA for spectral measurement

Leilei Zhang1,2,3, Zhensong Cao1,3, Qing Zhong4, Yinbo Huang1,3, Zihao Yuan1,2,3, Jun Huang1,3, Gang Qi1,2,3, Wenxue Pan1,2,3, and Xingji Lu1,3、*
Author Affiliations
  • 1Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
  • 2Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
  • 3Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China
  • 4Military Representative Office in Mianyang of Space System Department, Mianyang 621000, China
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    Figures & Tables(15)
    Block diagram of quadrature phase lock-in principle
    (a) Sine and cosine reference signal generated based on DDS principle; (b) Waveform changes with frequency
    (a) Amplitude frequency response of improved CIC filter with different integration length; (b) Relation between cut-off frequency of improved CIC filter and integration length
    FIR amplitude frequency response
    (a) JPL root of sum of squares; (b) JPL residual; (c) CORDIC root of sum of squares; (d) CORDIC residual
    Block diagram of digital lock-in amplifier
    Software interface
    Program flow chart
    Hardware circuit of digital lock-in amplifier
    (a) TDLAS system structure; (b) Experimental device of TDLAS system
    (a) Direct absorption signal; (b) 2f signal
    2f signal peak value and CO2 concentration
    (a) Fluctuation of CO2 concentration; (b) Allan variance
    System response when CO2 concentration changes
    • Table 1. Volume comparison of lock-in amplifier

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      Table 1. Volume comparison of lock-in amplifier

      TypeL×W×H/cm3Volume/cm3
      SRS83043×50×1327950
      ZI-MFLI23×28×106440
      LIA-BVD-15018×10×1.5270
      DLIA-111.6×8.6×1.5150
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    Leilei Zhang, Zhensong Cao, Qing Zhong, Yinbo Huang, Zihao Yuan, Jun Huang, Gang Qi, Wenxue Pan, Xingji Lu. Digital lock-in amplifier controlled by FPGA for spectral measurement[J]. Infrared and Laser Engineering, 2023, 52(10): 20230023

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    Paper Information

    Category: Optical devices

    Received: Feb. 25, 2023

    Accepted: --

    Published Online: Nov. 21, 2023

    The Author Email: Lu Xingji (.xjlu@aiofm.ac.cn)

    DOI:10.3788/IRLA20230023

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