The Research On Electronics Theory And Key Technology Of Cooled Staring Infrared Detector And Simulated Detector

Recently, the infrared imaging technology has been widely applied in both the area of military and civilian. This technology has been developed fast. In the past decades, the developed countries have achieved great successes in this kind of research. But mean time, they strengthened the blockade in the aspects of sale and technique support to China, which lead our country in the slow process of self-study in this field. To crack this blockade, our research scientists have done continuous efforts to improve the technical level of our own. We have manufactured the pure domestic stare cooled infrared focal plane array(IRFPA) detector. Due to some defects, our product is not comparable to which imported overseas. Thus, we have done some crucial research in this paper by means of establishing the theoretical model according to the basic theory of IRFPA detector, analyzing the performance feature and raising better techniques to manufacture high performance IR imager. All the works have great significances to improve our own infrared imaging technology in the national defense building and the pace of national economy in various fields of application.This paper is focused on the research of the internal mechanism of the stare cooled IRFPA detector and the performance of the readout circuit. The research work contains the following parts:We analyzed the influence to the photocurrent caused by the component differences during the manufacture. According to the result, we concluded the relationship between the component differences and the nonlinear response of the detector. And thus, a double exponential curve model has been presented according to the analysis. Through the study of the internal noise existing in the detector, we concluded the increase manner between the noise and the integration time by using the sided power spectral density function of these noises. With this result, we detailed the relationship between the integration time and the signal-noise ratio of the detector combining the procedure that the external radiation received by the FPA and then transformed into the photocurrent form. We also compared the differences in the design structure and the readout theory of two types of readout circuits-digital readout circuits and analog readout circuits to distinguish the source and the uncertain of the readout noise. In this paper, we also focused on developing higher and better performance proxy circuit technology when the detector performance has been established. In this kind of study, we aimed on several crucial aspects which directly related to the detector performance. We have raised the ultralow noise bias voltage technology, the highly precise digital signal process technology and ultralow noise analog signal amplify technology. These technologies can lower the noise on the bias voltage, reduce the energy reflection on the digital signal transmission line and amplify the detector analog signal in the balance between the noise level and power consumption. These technologies have been applied in the project to prove its superiority to the other products in the market. Meanwhile, we have presented a new dynamic range self-adapt technology based on the scene target temperature calculation. This technology can real-time monitor the radiation temperature condition in the scene, make sure that the dynamic range of the detector analog signal always position at the best analog-digital converting scale. This technology has greatly lowered the pressure of the image processing algorithm. At last, we also raised a complete system design of the infrared simulate detector. This simulate detector is an independent system, which can be configured by the software on the PC. This simulate detector can simulate both the two aspects of the function and the performance of the real detector. The simulate detector focused on the simulation of the stripes non-uniformity, the readout column channel gain non-uniformity, blind pixel and the output noise of the real detector, and realized the user-friendly parameter changeable. All these simulation models can effectively reappear the performance of the real detector. Meanwhile, through the hardware module in the simulate detector such as external proxy signal receiving module and analog signal output module, we can effectively reappear the function of the real detector. This simulate detector can let the researchers conduct the function test of the infrared imaging component and the performance test of the image process algorithm beforehand, which greatly reduced the develop period and give protection to the use of the real detector. All these works done in this paper have great significances to improve the research of our domestic infrared thermal imaging field. At the end of the dissertation, we offered the inadequacies during my research and the prospection of the research in IR imaging.