Research On Uncooled Infrared Imaging Component Based On FPGA

Infrared imaging technology has a wide range of application requirements in the military and civilian fields due to its unique characteristics.In recent years,with the rapid improvement of semiconductor integration technology and manufacturing processes,uncooled infrared imaging systems have disadvantages compared to refrigerated infrared imaging systems.With rapid improvement,its own advantages have become more prominent,and it has been widely promoted and applied in various industries.The uncooled infrared focal plane array detector is the core of the infrared imaging system.Its characteristics limit the upper limit of the performance of the infrared imaging system.The infrared imaging component based on this type of detector is the main body of the imaging system.Its hardware circuit design and non-uniformity Correction is the key to fully demonstrate the performance of the detector,and is the basis for the application and development of infrared imaging systems.Based on the technical research project requirements of the Provincial Department of Science and Technology,this paper aims at the design and development of high-performance uncooled infrared component systems,and conducts in-depth research on uncooled infrared imaging systems,component development,and non-uniformity correction processing.The domestic uncooled infrared detector is used in the design.Based on the analysis of component functions and parameter performance,a design scheme of infrared imaging components based on FPGA as the main core processor is proposed.The bias voltage,FPGA timing driver,AD Units such as conversion,data acquisition,TEC temperature control,output interface and system power supply carried out specific design and simulation debugging.Due to the extremely high noise requirements of the detector,Therefore,in the design of the power supply and the bias voltage,a low-noise LDO chip and a second-order low-pass filter are used to avoid the impact of high-frequency noise on the circuit,and the circuit noise is simulated;The analog-to-digital conversion part uses a 14-bit AD conversion chip AD9240 to achieve fast and high-resolution image information acquisition;the data acquisition and transmission module is implemented by FPGA and Camera Link interface to achieve data transmission and acquisition and control of the camera,and a VGA interface is designed to facilitate connection with the monitor;TEC temperature control circuit The chip temperature control chip is the core to ensure the stable focal plane temperature of the detector.Based on this,research on the non-uniformity correction algorithm was carried out,and the typical non-uniformity correction algorithm correction effect was compared through simulation analysis.An improved non-uniformity correction algorithm based on time-domain high-pass filtering was proposed,and compared through the non-uniformity test.It is confirmed that the algorithm in this paper improves the uniformity close to 5%,and can well suppress the non-uniformity and "ghost image" of the image,making the image clearer.Finally,the performance test was performed on the uncooled infrared component system,and its noise equivalent temperature difference was in line with the expected effect of the design and met the design requirements.