Design Of Low Noise Imaging System Based On SCMOS

At present,most of the low noise imaging systems are based on large size pixel CCD devices.In order to obtain high quality images,special refrigeration equipment is needed,and the system is often very large.In recent years,with the advantages of special technology and technology produce,the Fairchild and many other semiconductor companies design the sCMOS(scientific CMOS)devices,which inherits the CMOS devices advantages of high speed,low power consumption,high integration,high sensitivity,high dynamic range,low dark current,low readout noise by CCD devices.It has become the first choice for some low noise imaging systems,which can be used in different light conditions to realize large array,high frame frequency and low noise imaging.Low noise imaging system has a broad application prospect in the fields of medical science,ocean spectrum,deep space exploration and so on.This paper designs an imaging system based on the sCMOS device CIS2521 F,and mainly includes four works as follows:1.Based on the analysis of design requirements of the imaging system,the paper completes the process design of imaging processing,and decides sCMOS + FPGA + DDRII + Camera Link as processing architecture.2.The paper completes the design and division of the hardware circuit function of the imaging system,and decides the composition of the hardware circuit is the detector board + signal processing board + Camera Link board.It focuses on the power distribution and clock network,the peripheral circuit of the detector,the FPGA control circuit,and the Camera Link digital circuit.3.The paper completes the software system design based on FPGA device.The software system consists of modules of sCMOS control module + data acquisition module + data cache module + transmission control module.The power sequence,detector configuration,logic drive,clock generation,detector output data interface,image data caching and transmission are realized,and software simulation and board confirmation test are completed.4.The paper calculates the imaging quality and analyzes the factors that affect the noise level.When working under rolling shutter exposure mode,the resolution of the system is 2560 × 2160,and the imaging system achieves the frame frequency 17.4fps,circuit noise 3.5e-,and power consumption 6.36 W.