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Modified Two-Point Correction Method for Wide-Spectrum LWIR Detection System.

Di Zhang1,2, He Sun1,2, Dejiang Wang1,2

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

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Summary

Fixed-pattern noise (FPN) degrades infrared image quality. This study introduces a modified two-point correction (TPC) method accounting for atmospheric transmittance to improve long-wave infrared (LWIR) system uniformity, especially for sky target detection.

Keywords:
atmospheric transmittancefixed-pattern noiselong wave infrarednon-uniformity correctiontwo-point correction

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Area of Science:

  • Infrared technology
  • Optical engineering
  • Atmospheric optics

Background:

  • Fixed-pattern noise (FPN) is a significant issue in long-wave infrared (LWIR) imaging systems, degrading image quality.
  • The standard two-point correction (TPC) method is insufficient for wide-spectrum LWIR systems detecting faint targets, particularly in atmospheric conditions.
  • The impact of atmospheric transmittance on LWIR system non-uniformity has not been previously investigated.

Purpose of the Study:

  • To develop a modified two-point correction (TPC) model that incorporates atmospheric transmittance for wide-spectrum LWIR systems.
  • To analyze the influence of atmospheric transmittance on the non-uniformity correction coefficients in LWIR systems.
  • To enhance image uniformity in LWIR detection systems, especially for weak and small target detection in the sky.

Main Methods:

  • Proposed a modified TPC model by subdividing the spectrum and integrating atmospheric transmittance.
  • Analyzed the effects of atmospheric transmittance on LWIR non-uniformity correction coefficients.
  • Conducted experiments using a wide-spectrum LWIR system with a Sofradir focal plane array (FPA) on black body and sky scenes.

Main Results:

  • The modified TPC model effectively reduces image non-uniformity in wide-spectrum LWIR systems.
  • Incorporating atmospheric transmittance into the calibration process significantly improves image uniformity.
  • Experimental validation confirmed the model's efficacy in reducing fixed-pattern noise for sky target detection.

Conclusions:

  • Atmospheric transmittance is a critical factor affecting non-uniformity in wide-spectrum LWIR systems.
  • The proposed spectral subdivision TPC method, including atmospheric transmittance, enhances LWIR image quality.
  • This approach offers improved performance for LWIR detection systems, particularly in challenging atmospheric environments.