Abstract:The research progress of extrinsic doping of mercury cadmium telluride (Hg1-xCdxTe, MCT) materials in recent years is presented. The extrinsic doping of MCT refers to that an impurity doped is the element other than Hg, Cd or Te. The basic concept of a MCT crystal structure is described. The fundamental principles of MCT doping and the methods for selecting dopant are discussed, with an emphasis on the properties of some common dopant. In the design of a MCT detector, the control of the space distribution and concentration of a dopant is very important.

Abstract:According to a space object color temperature measurement technology, a method for selecting optimal waveband and improving temperature resolving power and sensitivity of a space object detection system is proposed. Comparing the radiance values of a space object at different wavelengths, the relation between the homochromatic radiance and the wavelength and temperature of a standard blackbody is deduced. A mathematic model for measuring the temperature of a space object is established. Thus, the negative influence of the emissivity on temperature measurement is avoided. In addition, a mathematic model for optimizing the waveband is established. By analyzing the relation between the temperature resolving power and sensitivity and the detection waveband, the optimal detection band is selected for the system and its temperature measurement accuracy is improved. This waveband selection based on an infrared system is simulated. The result shows that when the bandwidth of 60 nm is selected in the range from 8.0 to 8.5 μm, the detection system has its temperature resolving power up to 0.07 K for a space object with a temperature of 200 to 300 K. Its temperature resolving power and sensitivity are increased by 0.079 and 0.113 respectively. The waveband optimization is very useful for the improvement of the temperature resolving power and sensitivity of a space object detection system. This work can provide fundamental support for the development of space object detection and recognition equipment.

Abstract:A geostationary meteorological satellite plays an important role in modern weather forecast and public services. The data processing system of the geostationary meteorological satellite is a very complex system. Because of the problems of the software and hardware used in satellite and ground systems, the quality of the cloud images is often affected. A method based on the Euclidean distance algorithm is proposed. It can be used to evaluate the quality of the cloud images produced in real time. The feasibility of this algorithm in the ground system of the geostationary meteorological satellite is discussed. The comparison of the result with the historical data shows that this method can identify at least 90 % of inaccurate cloud images.

Abstract:Because it is difficult and somewhat dangerous to build a laboratory for simulating Venus environment, we firstly simulate the atmospheric environment of Venus by using computers. Then we simulate the whole process of a balloon moving from all platforms to a final stable height in the above environment. By comparing the simulation results of the balloon under different parameters, we can assist the design of the balloon for Venus detection better. Finally, we put forward a new idea of establishing the Earth and Venus equivalent horizontal distance relationship, so as to simulate the infrared transmittance characteristics in the Venus environment, provide reference information for the design of Venus infrared payload systems and also provide a new direction for the follow-up study of Venus balloons and their infrared payload systems.

Abstract:On the basis of analyzing the research status of infrared imaging simulation systems, the typical small infrared target models and moving filtering algorithms are analyzed. According to the inner structure and materials of an air vehicle and the related theory of aerodynamics, physics and heat radiation, an infrared radiation model of the air vehicle is established in the aspects of scarfskin, pout and plume. By using the characteristics of the Digital Mirror Device (DMD) system, the model is simplified and the image generation rate is improved. Finally, the model and the algorithm are demonstrated on the DMD imaging simulation system platform. The result shows that this method has the features of clear image, high signal-to-noise ratio, high image generation rate, short storage time and stable tracking etc..

Abstract:The multi-scale and multi-level characteristics of urban-heat islands have been paid more attention in the fields of Geographic Information System (GIS) and Remote Sensing (RS) etc. Although the urban habit society can be disturbed by some artificial heat sources, it still exhibits a certain periodicity and regularity. By fully utilizing the methodology used in the study of urban heat-island effect, a concept of the eco-organic life in a urban habit society is proposed and the heat diseases based on material and energy exchange of the open and complex eco-system are summarized and analyzed. The heat and green effect and its physical generation process in an urban habit society are analyzed from the perspective of living comfort. By using a small infrared scale to detect the heat environment in an urban habit society, the features of three-dimension, multi-level, multi-object and non-linearity are highlighted. To improve the heat environment in an urban habit society, the heat environment distribution and ecology controlled by the green function are evaluated. The result shows that the construction of an urban habit society has a direct relationship with the geographic distribution of a heat environment. The green control methodology is an important operable technique. Therefore, the related innovative research and its effectiveness will be further studied in future qualitative description, quantitative simulation and measurement.