Hardware Design Of Uncooled Infrared Imager System Based On FPGA

Uncooled infrared mini imager system has been widely used in military,industrial and civil fields,and quickly became a hot research at home and abroad.In this thesis,we discuss the Uncooled infrared mini imager system based on non cooled infrared focal plane detector UL04472,the detector chip is from ULIS company.The main processor of system is hard core process embedded in the Altera FPGA Cyclone V.The power consumption of the design is less than <2.5W,and the size of circuit board is only 32x32(unit: mm),interfaces and functional modules are scalable hardware platform.Through the comparison of a large number of programme,the core architecture of FPGA+HPS+MCP is determined.It is the first time hard core processor(HPS)SOC scheme is applied to the design,effectively improve the overall performance,the platform can run a Linux system,TF card storage,network transmission and intelligent analysis function etc.These features required a very complex subsequent processing system to complete previously,but now it can be achieved in a small soc chip.The MCP structure has been used in the design,which greatly saves the area of the PCB board and reduces the power consumption of the system.According to the characteristics of the detector bias power supply small current,low Rms ripple noise,a new bias circuit is designed,which has a very low ripple noise,which can effectively guarantee the S/N ratio of the detector output.The detector output analog video,through the impedance conversion,signal conditioning,single ended to differential,active filtering circuit is sent to the ADC for analog to digital conversion,and then sent to FPGA logic do a sequence and non uniformity correction,image enhancement processing,eventually through the video encoder to analog(CVBS)and digital(HDMI)two output.PCB design of the system is divided into 3 single board,according to the function is divided into the detector driver board,core processing board,power supply and interface board.A reasonable division of the hardware level structure,for different detectors and subsequent interface changes,only need to modify the sensor driver board or interface board,and the most complex core processing board can continue to use.According to the requirements of the timing of the detector,design of the detector driving logic,serial logic controller,video capture logic,clock control logic module independent by the bus clock,reducing the overhead of the logic design resources,reduces the power consumption of the system,parametric design,to ensure the portability of the logic module.Finally by evaluating,the subject of research and development of infrared thermal imager hardware platform with characteristics of small size,low power consumption,light weight,strong performance,easy to expand,hardware and software can be upgraded in the overall scheme,on performance and function better than competitors one to two generations.