Infrared and Laser Engineering, Volume. 52, Issue 12, 20230291(2023)

Spectral calibration method for mid-infrared AOTF imagers

Kai Yu1, Qi Guo1, Na Li1,2, Chi Cheng1, and Huijie Zhao1,2,3
Author Affiliations
  • 1Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation & Opto-Electronic Engineering, Beihang University, Beijing 100191, China
  • 2Institute of Artificial Intelligence, Beihang University, Beijing 100191, China
  • 3Aerospace Optical-Microwave Integrated Precision Intelligent Sensing, Key Laboratory of Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China
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    Figures & Tables(12)
    Frequency drift on image plane
    Schematic diagram of reverse ray tracing
    Layout of the scaled wave vector
    Simulation of spectral correction
    Light source and prototype of the spectral correction experiment. (a) Light source; (b) Prototype
    Setting of sampling points for spectral drift correction experiment
    Test results of frequency response. (a) Selection of ROI region; (b) Fitting of frequency response; (c) Frequency response of sampling points 1-11
    Spectral calibration results. (a) Before spectral calibration; (b) After spectral calibration
    Correction results of full field
    Comparison of spectral response
    • Table 1. Performance parameters of mid-infrared AOTF spectral imaging detection system

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      Table 1. Performance parameters of mid-infrared AOTF spectral imaging detection system

      Performance indexParameter value
      Working band3.7-4.8 μm
      Focal length50 mm
      Number of pixels320×256
      Pixel size30 μm×30 μm
      Spectral resolution44 nm (average)
      Cut angle8.9°
      Rear wedge angle of AOTF
    • Table 2. Spectral drift correction results for sampling points 1-11

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      Table 2. Spectral drift correction results for sampling points 1-11

      Peak wavelength/nmSpectral drift/nmRelative error
      OriginalCorrectedOriginalCorrectedOriginalCorrected
      14459.324482.92−15.687.926.03%3.04%
      24470.304481.71−4.706.711.81%2.58%
      34475.754481.020.756.020.29%2.32%
      44476.514485.341.5110.340.58%3.98%
      54473.244480.52−1.765.520.68%2.12%
      64466.544478.95−8.463.953.25%1.52%
      74456.914483.52−18.098.526.96%3.28%
      84444.784479.02−30.224.0211.62%1.55%
      94430.534484.20−44.479.2017.10%3.54%
      104414.494477.88−60.512.8823.27%1.11%
      114396.954479.23−78.054.2330.02%1.63%
      194451.114486.54−23.8811.549.19%4.45%
      294452.094475.21−22.910.218.81%0.08%
      334393.064485.42−81.9410.4231.51%4.01%
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    Kai Yu, Qi Guo, Na Li, Chi Cheng, Huijie Zhao. Spectral calibration method for mid-infrared AOTF imagers[J]. Infrared and Laser Engineering, 2023, 52(12): 20230291

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    Paper Information

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    Received: May. 16, 2023

    Accepted: --

    Published Online: Feb. 23, 2024

    The Author Email:

    DOI:10.3788/IRLA20230291

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