Abstract:According to the application features of miniature infrared detector assembly integrated technology, the current status of miniature infrared detector assembly integrated technologies at home and abroad is presented. Several key technologies in infrared detector assembly integration are discussed. The research and development of these technologies are of great importance to the promotion of the application of miniature infrared detector assemblies.

Abstract:Under the frame of thought experiment, the concept of generalized particle which has variable volume or shape is proposed. The origin of the concept of the speed of light is analyzed. The impossibility of faster-than-light is discussed. The view that the universe originated from the split of an initial photon black hole is proposed. The quasars that are moving close to the speed of light are the first evidence to support the photon splitting model. The photon can be divided into high energy and low energy photon. The problems of arrangement and selection of photonic data are discussed. The concept of blackbody can be derived from the blackhole. The derivation process of the blackbody radiation formula based on MATLAB is introduced in this paper. The blackbody radiation formulae for low energy photons (i.e., the Planck’s formulae) can be obtained by adding a zero in the photonic data sequence; otherwise, the blackbody radiation formula, which includes high energy photons, is obtained, and the result tends to infinity. For the description of the ultimate fate of the universe, without introducing any other concepts or terms such as entropy, the photon splitting model plus the radiative heat transfer model can be used to obtain the conclusions which are equivalent to that from the theories of heat silence or dissipative structure. The dark matter particle (or simply, the darklet) model which is based on photon splitting is presented. The darklets are the second evidence to support the photon splitting model. A cycle model between the speed of light and the non speed of light is proposed for the evolution of the universe.

Abstract:To assess the influences of non-imaging light radiated or reflected by sun, cloud and earth surface on space optical systems, a set of stray light test equipment with a 1-meter aperture is established by simulating the space environment on the ground. According to the development experience of advanced stray light test equipment of foreign countries, a double cylindrical chamber is used in the equipment. So, it can reduce the light pollution such as the reflection, scattering and diffraction in the test environment and make the test accuracy lg(measurement value/true value) of Point Source Transmission (PST) to be less than ±0.5. The operation principle, components and function of the equipment are presented. The equipment is used to test the PST curves in the visible spectral band both in the west-east direction and in the north-south direction. The stray light suppression of the camera can be up to 10-6 order of magnitude. The measured curve is in good accordance with the theoretical simulation curve. This shows that the stray light test equipment has high accuracy and reliability and can meet the stray light test requirements of space optical systems.

Abstract:A glacial acetic acid infrared gas sensor based on nondispersive infrared principle is proposed. The principle of the glacial acetic acid infrared gas sensor is presented. Then, the structure design of the sensor is described in detail. The optical path of the sensor is simulated by using the LightTools simulation software. Finally, the prototype of the glacial acetic acid infrared gas sensor is obtained. The test results show that the measurement accuracy of the sensor is better than ±1% F.S. in the range from 0 to 5000 ppm. Its response time (T90) is 29 s. In the light source of the sensor, electric modulation is used and the mechanical chopper structure in the light source of the traditional infrared gas sensor is removed. Thus, the volume of the sensor is reduced and its stability is improved. So, this sensor has a wide application prospect in the fields of acetic acid transportation, storage and use etc.

Abstract:A new passive check valve for Mechanical Pumped Cooling Loops (MPCL) is designed. Static structural analysis and flow characteristic simulation of the diaphragm-type passive check valve designed are performed by the software ANSYS. The forward flow and leak flow characteristics of the check valve are tested experimentally. The results show that the performance of the check valve can completely meet the requirements of the mechanical pump. The check valve is of referential significance to the research on the improvement of the performance of mechanical pumps.

Abstract:The harmonic characteristics of linear motor drive circuits for mechanical crycoolers are studied. Selecting a 150 W linear motor as the research object, the harmonic analysis of its output voltage is carried out by theoretical simulation and experimental verification. The influence of the filter design on the harmonic characteristics of the drive circuit is explored. The filter is optimized by studying the relationship between the changes of inductance L and capacitance C of the filter and the output harmonics. The optimized filter is improved greatly in performance. The Total Harmonic Distortion (THD) of the output drive is reduced from 4% to 1.96%.

Abstract:According to the particularity of infrared and low light image registration, to reduce the amount of registration, an Speeded Up Robust Feature (SURF) registration algorithm improved both in determination of main direction and in description of feature points is proposed. Firstly, the edges of low light images and infrared images are detected respectively. Then, the improved SURF algorithm is used to extract the feature points of two kinds of image edges. Secondly, a nearest neighbor method is used to screen out the original feature points. After the feature points with higher accuracy are obtained, rough matching is carried out on them. Then, the RANdom Sample Consensus (RANSAC) algorithm is used to carry out precise matching on the feature points screened out one time. Finally, the precise feature points are used to establish a transform model and the images to be registered after resampling are registered with the reference images. The experiment results show that this improved algorithm not only can solve the registration problem of infrared and low light images, but also has better performance than the original SURF algorithm.

Abstract:Kalman algorithm is widely used in the fields of target tracking, wind direction prediction and nonuniformity correction. The prediction of scanning gray value of a linear array camera by Kalman algorithm is proposed. According to the real-time scanning of the linear array detector, the change in the gray level histogram is derived and normalized into Kalman''s formula. The statistical distribution of next time gray level is measured quickly by a recursive method. The integration time is predicted indirectly. Finally, the adaptive control of the dynamic range of the linear infrared detector is achieved. Several 8 bit images are used to provide simulation environment for different scenes. Then, the gray level distribution statistics in neat stage is predicted quickly and stably. The result provides an intelligent solution for the scanning of the linear array infrared camera.