Design Of Infrared And Millimeter Wave Composite Imaging Circuit

In recent years,multi detector composite imaging has become a research hotspot in the field of detection.With the development of millimeter wave detector materials and manufacturing technology,many new ideas and new methods in the field of image processing are put forward,The idea of combining infrared imaging and millimeter wave imaging is produced,that's to say design an infrared and MMW composite imaging system.As the same with infrared radiation,the object also radiates a microwave of the order of millimeter,and the passive millimeter wave detection technique is to detect the radiation of this millimeter wave.This kind of detection technology has its advantages in many scenes,so it has high research value and prospect in many fields such as security inspection,missile precision guidance,medical field and so on.However,due to the inherent limitations of the millimeter-wave detector material and the immaturity of imaging system,the final imaging effect of the current millimeter wave is not satisfactory,which also adds difficulties to the image display and image algorithm of millimeter wave.Infrared imaging technology has been widely used in our lives and military fields,due to the infrared detector materials and the maturity of device technology,infrared detectors have been able to achieve high sensitivity,and the infrared imaging images also reached a high Resolution.If the two imaging techniques can be combined to obtain a composite imaging system with strong anti-interference ability,high imaging resolution and strong penetrating ability,it is of great significance to the detection field.This thesis studies the weak signal amplifying circuit of 8 × 8 MMW array detector and its imaging system.On this basis,the millimeter wave imaging system is combined with 384 × 288 uncooled infrared imaging system,Infrared and millimeter wave composite imaging systems for control and image processing platforms.In the hardware aspect,this thesis gives the circuit design scheme of the whole imaging system,including the integral amplifying circuit of the millimeter wave weak signal,the system power supply scheme,the processing principle of the digital signal and the design and analysis of the subsystem,and gives the simulation process,Process,and ultimately build a complete FPGA-based imaging system hardware circuit.In the system control and image processing program design,this thesis uses FPGA as the system design of the main control and processing platform.By verifying the verilog program,the FPGA can control the timing of the integral switch,the acquisition switch and the reset switch of the integral amplifier circuit.And the FPGA can make the chips of the imaging system work normally according to the overall scheme of the system.Finally all modules are realized and the collected Infrared and millimeter-wave images are converted into digital signals through AD and passed into the FPGA for image nonuniformity correction,denoising and enhancement.At first,realize the imaging of millimeter wave,and then realize the grayscale weighted average of millimeter wave image and infrared image.