The Driver And Information Acquisition And Processing Technology Of Uncooled Long Wave Infrared Detector

As the most intense radiation of human body at normal temperature,the long wave infrared region is an important basis of detecting human targets.Therefore,the long wave infrared detector is widely used in the field of anti-terrorism,security,night vision,search and rescue,etc.According to whether the detector needs refrigeration,the long wave infrared detectors can be divided into cooled detectors and uncooled detectors.The uncooled detectors have low manufacture cost,small operational energy consumption,light weight and small size when compared with the cooled detectors.It is widely used in every aspects of our life at present.But in domestic market,the uncooled imaging devices which take domestic detector as the core are less than 20 %.In view of the special significance of uncooled infrared imaging system in production,life and national security,it is urgent to build an efficient imaging system with domestic detectors.Aim at this situations,a set of uncooled long-wave infrared imaging systems are designed based on the domestic detector for the site of accident after a disaster in this paper.Besides,this paper analyzes the main influence factors of the dynamic range of uncooled detector,and a new idea of adjusting dynamic range of the detector is proposed on the basis of this.Finally,an uncooled infrared imaging system is designed and verified in this paper,and the better imaging results are obtained.The main content and innovations of the paper are as follows:(1)Firstly,this paper introduces the market size and application prospect of infrared detectors at home and abroad briefly.It shows that China is facing a golden opportunity of the development of uncooled infrared detectors and it explains the background and value of the research,as well as the main research direction.(2)Secondly,this paper starts with the principle of infrared radiation,and then the working principle of the micro radiation thermeter is expounded.Finally,the relationship between non-uniformity,noise and the probe parameters,which have important influence on the imaging quality,are emphatically analyzed in this chapter.And a solution to reduce noise and non-uniformity of the detector is proposed.(3)Thirdly,this paper puts forward the design goals of light-small,modularity,low noise and wide dynamic range according to the theoretical analysis of the microbolometer,the application scenarios of the system and the domestic detector M01 B.Then the design idea is expounded from structure and circuit respectively.(4)Finally,In view of the problem that dynamic range does not match in the application scenario of this system,through the analysis of the main factors influencing the dynamic range in micro bolometer structure,compared with some mainstream dynamic range adjustment technology and combined with the characteristics of multi-capacitance switching of the detector and fine tuning of pixel bias on the chip,a dynamic range adjustment method for target adaptation is proposed.Finally,based on image edge detection technology,A set of feedback mechanism is established to realize the target self-adaptation of the local dynamic range,and the dynamic range of the whole machine system is increased by 10.4%.