The Design And Implementation Of Miniaturized Uncooled Infrared Thermal Imaging Components

Uncooled infrared thermal imaging technology has shown tremendous applicationsin both military and civilian fields. However, the research in this area started lately inChina, which makes this technology lag behind the developed countries. Fortunately,after years of research, some important progress in uncooled infrared detectors has beenmade. With the design of infrared imaging component, infrared thermal imagingtechnology can be further enhanced, which will meet the growing demands inapplications.Firstly, the theory of the uncooled infrared thermal imaging system and the mainfactors affecting the image quality are analyzed in detail. And then, miniaturizeduncooled infrared thermal imaging components with low power consumption weredesigned, based on the lab’s previous preliminary research. The design is implementedusing an FPGA-DSP hybrid architecture, and its hardware is designed modularly. Thecomponents consist of a power and a detector bias voltage driver circuit with low noise,a TEC temperature control circuit using PID compensation network, and infrared videoco-processing circuits based on FPGA and DSP. These parts provide excellent hardwareplatform for digital infrared signal processing. In this platform, the FPGA-basedalgorithms of automatic non-uniformity correction and adaptive image stretching aredesigned for the real-time imaging. In addition, output of the PAL analog video signalwith menu display function is implemented, by adding BT.656video encoding moduleand the OSD module into the design.The component works well in providing accurate, low-noise power supply anddriver signals. Rapid and effective correction and stretching process to digital infraredimage signal is accomplished. Stable and clear imaging can be achieved under differenttemperature scenes. The RMS noise of603.294μV and NETD of64.5mK are obtainedin testing.