Method for quickly identifying random code signals of CMOS sensors after irradiation

Abstract

The invention relates to a method for quickly identifying random telegraph signals of an irradiated complementary metal oxide semiconductor sensor. A device used in the method is composed of a static test platform, a sample test plate, a complementary metal oxide semiconductor sensor sample, and a computer. The method comprises the following steps: collecting a large number of dark field images using graph reading software installed on the computer, and converting image data into signals of which the gray values change with time; rearranging the obtained pixel signals of which the gray values change with time, and calculating out gradient information; filtering the gradient information of the pixel signals; carrying out reconstruction based on the filtered gradient signals and the original rearranged signals to get reconstructed signals; calculating the amplitude of fluctuation and the number of steps of the signals; and performing OR relational operation on the judgment result of the unfiltered signals based on a specific criterion and the judgment result of the filtered signals based on a specific criterion to get a result, wherein whether a pixel is a random telegraph signal can be judged correctly based on the result. The method is convenient and quick to operate, and is of certain versatility.

Description

technical field [0001] The invention relates to the technical field of image sensor detection, in particular to a method for rapidly identifying random code signals of complementary metal oxide semiconductor sensors after irradiation, and belongs to the technical field of microelectronics and the field of anti-radiation reinforcement technology. Background technique [0002] In recent years, the space application of complementary metal oxide semiconductor sensors involves the fields of earth survey, remote sensing imaging, star image acquisition functions such as star sensors, and space exploration and navigation such as spacecraft visualization systems. The reliability of its space application has an important impact on the on-orbit performance and operational life of the satellite. [0003] The random code signal means that the dark current of the image sensor presents a series of transiently separated fluctuations, which appear randomly on two or more steps. Random code ...

AI Technical Summary

Problems solved by technology

The main disadvantage of the observation and counting method is that it cannot be detected automatically and relies too much on the accuracy of the operator.

The threshold-based detection method is the fastest way to detect random code signals, but this method cannot obtain the information of random code signal noise and its threshold value is not universal, it should be selected according to specific devices and test conditions

Although the detection method of histogram analysis can better meet the various requirements of detection, this method takes a long time and leads to low detection efficiency of random code signals

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