A Method for Eliminating Non-uniformity of Picture Reproduction of Cooling Thermal Imager

Abstract

The invention belongs to the field of infrared detection technology, and in particular relates to a method for eliminating the non-uniformity of imaging reproduction of a cooling type thermal imager, comprising the following steps: (1) determining the hardware environment for implementing the method: an infrared thermal imager, an area source blackbody , sensor, host computer; (2) positioning source; (3) normal power-on of the infrared thermal imager; (4) parameter acquisition; (5) calculation and storage of mathematical model establishment and correction parameters; (6) infrared detection A correction module to eliminate the non-uniformity of reproduction is set in the core component; (7) remove the sensor, surface source blackbody, and host computer; (8) restart the infrared thermal imager. The corrected output image has a clear picture, a high dynamic range, and uniform response of each pixel to the same radiation, which can make up for image defects caused by internal stray radiation and other factors. Improve the adaptability of the cooled thermal imager to the working environment.

Description

technical field [0001] The invention belongs to the technical field of infrared detection, and in particular relates to a method for eliminating the non-uniformity of imaging reproduction of a cooling type thermal imager. Background technique [0002] Infrared imaging technology is a technology that converts the difference in infrared radiation generated by the surface of each object in the target field of view due to differences in temperature or emissivity into visible images. In the military field, infrared imaging is widely used in the search, sight, reconnaissance, identification and tracking of military targets; the monitoring, warning, early warning and tracking of long-, medium- and short-range military targets; the precise guidance of infrared imaging; weapon platforms Driving and navigation; detection of stealth weapon systems, photoelectric countermeasures, etc. [0003] Cooled thermal imaging cameras have higher temperature sensitivity and accuracy and are the m...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the limitations of the technology level and other factors, the responsivity of each photosensitive element in the infrared focal plane detector cannot be exactly the same, the DC bias is also different, and the charge packets in the detection element have different transmission losses, etc. These differences make The brightness of the image formed by the imaging system is not the same even under the uniform target radiation

[0005] 2) At the same time, the uneven distribution of imaging energy due to the design of the optical system will also cause differences in imaging

However, as the use time increases and the temperature of the working environment increases, the infrared image will reappear with a specific pattern of non-uniformity

In view of the non-uniformity of this recurrence, there is no in-depth research on its mechanism, and no effective and feasible solution has been proposed.

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