Design And Implementation Of Cooled Mid-wavelength Infrared Imaging Components

Infrared thermal imaging technology uses the principle of infrared radiation.By measuring the infrared radiation energy of the object surface, the measured temperature distribution of object surface is converted into visually thermal image. It has many features such as a fast response speed, wide measuring range, non-contact measurement and visually image.It has received much attention in the field of military. Who mastered the advanced infrared imaging technology, who made the initiative of the night. In civilian areas, it has been used in the material defect detection and evaluation, building energy efficiency evaluation, the heat condition of Equipment diagnosis, production process control, automatic test, disaster prevention and reduction and many other aspects, showing more and more strong vitality.This thesis mainly studies the design and implementation of cooled mid-wavelength infrared imaging components.Based on the 320 x 256 MW cooled detector from French Sofradir Company and the FPGA hardware platform.The hardware includes the design and implementation of the detector buffer amplifier circuit, analog digital conversion circuit, signal processing circuit, design and digital analog conversion circuit, power supply circuit and other related circuits, The software includes a communication control, signal acquisition, signal processing and other image processing algorithms in fpga and PC control software. It has achieved a resolution of 320 x 256, two cameralink_full digital video interface, a 25-200Hz frequency, application of non uniformity correction, bad pixel filling, image enhancement and other image processing algorithms.It has completed real-time imaging simulation display, cameralink_full interface of 14bit digital image data output, real-time control through two ways of the serial port or the network UDP.The characteristics and innovation of this thesis are rich imaging component interfaces in hardware, fast digital image data of cameralink_full format for subsequent image processing.it can be real-time controlled with other imaging systems by computer and network exchange through network. The software uses the two-point nonuniformity correction technology.Based on the pre calibration coefficients, it can real-time calculats to generates new coefficients for correction operation according to the scene. Make image more suitable for the current measurement of the background. Real-time eliminating bad pixel technology eliminats new increase bad pixel based on the original bad pixel elimination. It realizes the real-time bad pixel distinguishing and eliminating of every frame image.The main results of this thesis is to design and implement the infrared imaging component. The functions are to meet customer’s demands on the aspact of frame rate, image control, image data output timing, two high-speed data output format, bad pixel processing. The noise equivalent temperature difference(NETD), non uniformity after correction, MRTD have reached a relatively high level. It has a wide application prospect in the high requirements on image quality in military field.