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Abstract <p>A group of current methods for compensating the negative impact of defective elements on the threshold characteristics of an infrared (IR) focal plane array (FPA) with the time delay integration (TDI) mode is examined. A distinctive feature of this group is the compensation based on deselection (disabling) of defective elements. Experiments have been conducted to study the effect of the investigated methods on the noise, signal-to-noise ratio (SNR), and specific detectability <i>D</i>* of channels in an IR FPA with the TDI mode. An analysis of the empirical data has shown that modern tools for compensating the negative effect improve the noise and SNR of channels. However, in some channels, these methods degrade the <i>D</i>* value. It is shown that this negative effect is caused by the defective element detection criteria used in modern solutions. The available detection rules cannot evaluate whether the change in the channel SNR after deselection can compensate the loss of their effective photosensitive area (EPA). A criterion for this evaluation is proposed. The combined use of this criterion with deselection makes it possible to improve the noise and SNR of FPA channels without deteriorating their <i>D</i>* value.</p>

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Comparing the Methods for Compensating the Negative Effect of Defective Photosensitive Elements on the Threshold Characteristics of Channels in an Infrared Focal Plane Array with the Time Delay Integration Mode

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • O. V. Gaponov,
  • M. A. Sokolsky,
  • E. K. Romanov

摘要

Abstract

A group of current methods for compensating the negative impact of defective elements on the threshold characteristics of an infrared (IR) focal plane array (FPA) with the time delay integration (TDI) mode is examined. A distinctive feature of this group is the compensation based on deselection (disabling) of defective elements. Experiments have been conducted to study the effect of the investigated methods on the noise, signal-to-noise ratio (SNR), and specific detectability D* of channels in an IR FPA with the TDI mode. An analysis of the empirical data has shown that modern tools for compensating the negative effect improve the noise and SNR of channels. However, in some channels, these methods degrade the D* value. It is shown that this negative effect is caused by the defective element detection criteria used in modern solutions. The available detection rules cannot evaluate whether the change in the channel SNR after deselection can compensate the loss of their effective photosensitive area (EPA). A criterion for this evaluation is proposed. The combined use of this criterion with deselection makes it possible to improve the noise and SNR of FPA channels without deteriorating their D* value.