Research On Nuclear Radiation Detection Technology Based On CMOS Sensors And Machine Vision

Nuclear technology is heavily applied in industry,agriculture,medicine,energy,environment,material modification,and other fields,and it also brings certain risks to public safety.The use of complementary metal oxide semiconductor(CMOS)sensors for nuclear radiation detection is a new research direction.The existing nuclear radiation detection methods based on CMOS sensors are limited to shading conditions and static scenes,without considering the influence of moving objects and other interference factors.A series of groundbreaking research on the use of CMOS cameras to detect nuclear radiation in dynamic scenes was conduct out in this paper:1.The characteristics of nuclear radiation blotches in CMOS imaging were studied,including morphological characteristics,pixel value characteristics,and inter-frame non-repetition characteristics,which provided data support and theoretical support for nuclear radiation bright blotch information extraction and bright blotch recognition.2.The extraction method of nuclear radiation blotches in CMOS imaging under dynamic scenes was studied,and the extraction of nuclear radiation highlights in dynamic scenes was realized for the first time.This work proposed an extraction method of nuclear radiation bright blotches based on the frame difference method and morphological processing,including the difference noise removal algorithm and moving object removal algorithm under the premise of retaining the bright blotch information.3.The recognition method of nuclear radiation highlights was studied,and a recognition model of nuclear radiation blotches based on image fusion and convolution neural network was proposed.To solve the problem of difficulty in obtaining the standard radiation bright blotch data set in the dynamic scene and being unable to label,an image fusion method based on maximum local total pixel was proposed with retaining the radiation bright blotch information and background information.4.The sensitivity of CMOS camera for nuclear radiation detection in dynamic scenes was studied.Based on the quantum efficiency(QE)of CMOS sensor and the analysis of bright blotch’s RB channel value,this paper proposed a long-wavelength pass filtering method to improve the sensitivity of nuclear radiation detection using CMOS camera.5.The localization of a mobile radiation source using multiple CMOS cameras under dynamic scenes.By studying the relationship between the radiation frame count and the radiation source distance,this article proposed a correlation calculation method of target distance and radiation frame count based on slope representation.Combined with the radiation source attribution method,the mobile radiation source location was realized.Based on the research in this paper,it is possible to realize real-time detection of nuclear radiation and localization of the mobile radioactive source in dynamic scenes.It is expected to establish a low-cost and broadly coverage nuclear radiation monitoring system based on CMOS surveillance cameras,which can be applied to nuclear power plants,hospitals,mines,ports of entry,and other scenes requiring nuclear radiation monitoring and video security monitoring,and provide guarantee for national security and urban security.