Abstract:The development of meteorological satellites of EUMETSAT/ESA is summarized and its program of next generation weather satellites used both in geostationary orbit and in polar orbit is presented. The next generation of geostationary weather satellites in MTG series will include an imaging satellite (MTG-I) and a sounding satellite (MTG-S). Both satellites will operate simultaneously and each of them will load different detection instruments. Six satellites (four MTG-I satellites and two MTG-S satellites) in MTG series are planned to be launched in the future. The polar orbit weather satellite named MetOp-SG will operate cooperatively with the satellite system of NOAA/NASA. The next generation satellite MetOp-SG of ESA will provide “morning” service just as the current MetOp satellite, and the next generation of JPSS satellite of NOAA/NASA will provide “afternoon” service. The data or information from MetOp-SG and JPSS satellites will be shared by both sides.

Abstract:Vapor phase growth of CdZnTe crystals under microgravity can overcome the convection induced by gravity and achieve growth without any contact. It is possible to get the material with uniform component, good surface, less defects and integrity structure. In this paper, the research on vapor phase growth of CdZnTe crystals under microgravity condition at home and abroad is reviewed.

Abstract:VO₂ thin films have been a research hotspot in the field of laser protection materials because of their excellent thermochromic properties. The research progress of VO₂ thin films at home and abroad is overviewed. The main material preparation methods, principle of infrared laser protection and protection waveband of VO₂ thin films are discussed. Finally, some challenges which will be faced in this field in the future are summarized.

Abstract:Military infrared detectors need large format, highly uniform and multicolor focal plane arrays operating in various infrared regions. A candidate which can meet this need is the Quantum Well Infrared Photodetectors(QWIP). As a new generation of infrared detectors, the QWIPs are based on the carrier confinement in ultrathin semiconductor heterostructures. The main advantages of GaAs/AlGaAs/QWIPs include standard III-V substrate material and technology, excellent thermal stability, uniformity, large area, low development cost and radiation hardness. Another important advantage of QWIPs is their band-gap engineering ability. By adjusting quantum well width and barrier composition, the device structure which meets the special requirements in multicolor focal plane array applications can be designed. The understanding of the physics of QWIP detection and the development status of multicolor QWIP technology in recent years are presented.

Abstract:Because infrared temperature measurement techniques are limited by some factors such as environment, applications and the characteristics of material itself, some novel noncontact temperature measurement methods have attention gradually. However, their simple analysis functions are not sufficient to meet the demands for wide usage. Among them, the static infrared image analysis is not able to solve more complex problems. For this reason, an infrared video temperature measurement method is proposed. The method is based on MFC. Its programming is completed by calling the OpenCV library. In the method, many functions such as point, line,and surface analysis and automatic high temperature point capturing can be implemented. The highest and lowest temperature analysis functions and the online highest and lowest temperature capturing functions are creatively added in the line and surface analysis. The experimental result shows that this method has the advantages of obvious dynamic analysis effectiveness, stable software running and higher temperature measurement precision.

Abstract:The condition and parameter design for an optical microcavity parametric oscillator formed by micro-flake GaAs crystals to generate terahertz (THz) wave were studied according to a cavity phase matching method. The optimum cavity length under the cavity phase matching condition was calculated. The output of THz wave was studied by adjusting the temperature of the GaAs crystal. The lowest energy thresholds at different wavelengths were simulated. The result showed that a wider tunable THz output range could be achieved more easily by using the cavity phase matching when the perfect phase-matching was difficult to realize. This result could provide experimental and theoretical reference for the development of miniature optical THz sources.

Abstract:The stability of a reflector assembly for a space remote sensor is an important factor which has an influence on the imaging quality of the optical system. By taking the reflector for a certain space remote sensor as an example, the main factors which have influences on the stability of the reflector in its manufacturing process, including the supporting structure, assembling stress, thickness, solidification and temperature variation of the adhesive layer, are analyzed. In the actual manufacturing process, the corresponding solutions for the above factors are proposed. They are design of a flexible supporting structure, design of a micro stress assembling method and device for the reflector assembly, design of a reasonable adhesive layer thickness control and solidification process and setting of a temperature variation range. Finally, the mechanical test, vacuum thermal cycle test and temperature test are carried out. The test results show that these methods can meet the stability requirements of the reflector assembly.