No-shutter uncooled infrared imaging system and nonuniformity correction method

Abstract

The invention provides a no-shutter uncooled infrared imaging system and a nonuniformity correction method. The system comprises an optical lens, an infrared detector, a field-programmable gate array, an analog-digital converter, a storage device and an image encoder. The optical lens collects optical signals of a target; the infrared detector converts the optical signals into analog voltage signals which are then converted by the analog-digital converter into digital signals which are output to the field-programmable gate array; the analog-digital converter carries out sampling on the analog signals output by the infrared detector and then transmits the signals to the field-programmable gate array; and the field-programmable gate array processes the digital signals and outputs the processed signals. The method is characterized by, to begin with, collecting response values of the system for the same uniform target background; calculating substrate temperature of an infrared focal plane array; then, calculating background value under the current state according to the background values and the substrate temperature; and finally, carrying out nonuniformity correction by utilizing one-point correction. The method has the advantages of easy realization and high precision and can be widely applied to the current uncooled infrared imaging system.

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] Such as figure 2 As shown, a typical u...

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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