CMOS APS摄像机的γ射线辐射损伤模式与损伤表征研究  

Study on γ-Ray Irradiation Damage Mode and Characterization of CMOS APS Camera

作　　者：徐守龙 林奎成 韩永超[4] 邹树梁 余修武 吴其反[2] 曲延涛[4] 全洪涛 李增彦 Shoulong Xu;Kuicheng Lin;Yongchao Han;Shuliang Zou;Xiuwu Yu;Qifan Wu;Yantao Qu;Hongtao Quan;Zengyan Li(School of Resource Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Instituted of Materials,China Academy of Engineering Physics,Mianyang,Sichuan 621700,China;CNNC New Energy Company Limited,Beijing 102413,China;School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China;Northwest Institute of Nuclear Technology,Xi′an,Shaanxi 710024,China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001 [2]清华大学工程物理系,北京100084 [3]中国工程物理研究院材料研究所,四川绵阳621700 [4]中国原子能科学研究院辐射安全研究所,北京102413 [5]电子科技大学机械与电气工程学院,四川成都611731 [6]西北核技术研究所,陕西西安710024

出　　处：《光学学报》2020年第15期151-159,共9页Acta Optica Sinica

基　　金：国家自然科学基金(11905102,61601423);湖南省教育厅优秀青年项目(18B268);南华大学引进人才科研启动项目(190xQD065)。

摘　　要：为了研究以CMOS有源像素传感器为感光元件的摄像机系统的辐射损伤模式及损伤表征,利用在线辐射实验的方法,结合辐射干扰噪声抑制算法,研究了彩色视频图像信息随辐射总剂量的变化情况,并讨论了不同辐射总剂量照射下硬件的辐射寿命,以及γ射线辐射对数字图像信息的影响。研究结果表明:摄像机的γ射线辐射损伤模式主要表现为透光率下降,传感器的暗电流增大、失真和损坏,以及主板的瞬时损坏;感光元件的辐射总剂量效应主要导致本底噪声的增大,且噪声主要集中在图像的暗部;暗电流导致图像灰条纹中平均像素值的增量远不及因镜头透光率下降而造成平均像素值的减小量;摄像机自带的曝光补偿功能在检测到视频图像亮度下降后会进行全局补偿处理,增大视频所有像元的像素值。该研究得到的视频图像信息随辐照总剂量变化规律可以作为一种以CMOS有源像素传感器为感光元件的摄像机辐射总剂量标定的一种方法,帮助判断此类摄像机的辐射损伤失效几率,提高视频监控系统在放射性环境中应用的可靠性。In order to study the radiation damage mode and characterization of the camera system with CMOS active pixel sensor as the photosensitive element,this paper uses the method of on-line radiation experiment,combined with the radiation interference noise suppression algorithm,to study the change of color video image information with the total radiation dose,and discusses the radiation life of the hardware under the irradiation of different total radiation doses and the effect ofγ-ray radiation on the digital image information.Results show that the mode ofγ-ray radiation damage of the camera is mainly reflected in the light transmittance decrease caused by the radiation damage of the lens,the dark current increase,distortion and damage of the sensor,and the instantaneous damage of the main board.The total radiation dose effect of the sensor mainly results in the increase of background noise,and most of the noise signals are concentrated in the dark part of frames.The increment of the average pixel value in the gray stripe of the image caused by the dark current is far less than the decrease of the average pixel value caused by the lens radiation damage.The exposure compensation function of the camera will carry out global compensation processing after detecting the decrease of video image brightness,which increases the pixel values of all pixels.The relationship between the video image information and total ionizing dose can be used as a method to calibrate the failure probability of the CMOS active pixel sensor camera,which can improve the reliability of the application for this kind of video monitoring system in the radiation environment.

关 键 词：光学器件 有源像素传感器摄像机 Γ射线 损伤模式 损伤表征 辐射寿命 

分 类 号：TN946.1[电子电信—信号与信息处理]