Shutterless Uncooled Infrared Imaging System and Nonuniformity Correction Method

Abstract

Based on an uncooled infrared imaging system without a shutter and a non-uniformity correction method, the system includes: an optical lens, an infrared detector, a field programmable gate array, an analog-to-digital converter, a memory, and an image encoder; Optical signal, after the infrared detector converts the optical signal into an analog voltage signal, it is converted and output to the field programmable gate array by the analog-to-digital converter; the analog-to-digital converter samples the analog signal output by the infrared detector and transmits it to the field programmable gate array gate array; the field programmable gate array processes and outputs the digital signal; the method first collects the response value of the system to the same uniform target background; and calculates the substrate temperature of the infrared focal plane array; then according to the background value and the substrate temperature , to calculate the background value in the current state; finally use one point correction to correct the non-uniformity of the image. The invention has the characteristics of easy realization and high precision, and can be widely used in current non-cooling infrared imaging systems.

Description

technical field [0001] The present invention relates to an uncooled infrared imaging system and a correction method, in particular to an uncooled infrared imaging system and a non-uniformity correction method based on no shutter, and completes automatic correction of the uncooled infrared imaging system on the basis of no need for a mechanical shutter. The invention relates to non-uniformity correction and belongs to the technical field of infrared imaging. Background technique [0002] Ideally, when the focal plane array imaging unit receives uniform irradiation, its output amplitude should be exactly the same. In fact, due to the inhomogeneity of the processing technology, material, temperature and bias of the infrared detector, its output amplitude is not the same, that is, in the case of uniform thermal radiation, the response output of each imaging unit is not consistent. It is the non-uniformity of the infrared system. [0003] like figure 2 As shown, a typical unco...

AI Technical Summary

Problems solved by technology

However, the use of shutter components makes the structural design of the uncooled infrared system more complicated, and the probability of failure of the shutter components is high, and the failure will directly affect the normal use of users. At the same time, the poor shock resistance of the shutter components has also become a problem. The bottleneck of improving the overall shock resistance of the uncooled infrared system limits the application range of the uncooled infrared system

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