Video Monitoring System Availability in Radiation Accident Condition

Study of availability in radiation environment is presented for video monitoring system. Testing experiment has been completed by seven kinds of Image sensor module which includes three kinds of digital image sensor module and four kinds of analog image sensor module. Radiation accident condition was simulated by γ-ray ionizing radiation environment where the dose rate at 16.63Gy/h 20.20Gy/h and 58.30Gy/h. Availability has been studied by analyzing real time monitoring image quality parameters captured in γ-ray exposure environment. The primary image quality parameters include average gray level of the dark image and synthetic brightness of the color image. The most suitable image sensor module has been selected by image quality parameters for comparison before and after irradiation. Experimental results show that, digital camera has minimum background noise. The radiation resistance of CMOS image sensors is better than CCD image sensors. Therefore, digital video monitoring system with CMOS image sensor has the best image quality parameters and slightest effect in γ-ray ionizing radiation environment where the dose rate is less than 58.30Gy/h. Meanwhile, adequate light could reduce noise interference reduced by γ-ray for all types of video monitoring system. However, digital signal processing integrated circuit board has been destroyed when the accumulated dose reach to 88.40Gy, but the CMOS image sensor integrated circuit board has normal working parameters. As a conclusion, digital video monitoring system with CMOS image sensor could be used for real-time monitoring in radiation accident condition, but the digital signal processing integrated circuit board needs to be hardened by radiation hardened technology.