Abstract:To realize super miniature, long focal length and super wide field-of-view, a highly integrated infrared optical system with four fields of view is proposed and designed. The system adopts a double optical path structure including a super narrow field-of-view optical system and a narrow field-of-view/middle field-of-view/wide field-of-view optical system. The two optical paths share a relay group. The super narrow field-of-view optical system is folded four times in three dimensions. The narrow field-of-view/middle field-of-view/wide field-of-view optical path is folded twice. Through above six folds, the size of the optical system including two optical paths is reduced effectively. Its shape envelope is in the range of 242 mm×150 mm × 85 mm (local 125 mm). Thus, the optical system is highly integrated. This double optical path optical system has four fields of view including a super narrow field-of-view, a narrow field-of-view, a middle field-of-view and a wide field-of-view. Among them, the super narrow field-of-view has a focal length of 688 mm and a field-of-view of 0.8 degree. The large field-of-view has a focal length of 13.19 mm and a field-of-view of 40 degree, in which long focal length, super large field-of-view and zoom ratio of 50 are realized. The super narrow field-of-view optical system merely uses five lenses. It has the features of high transmittance and passive optical athermalization design. The whole dual optical path optical system has compact structure and small size and realizes its super miniaturization. The design results show that the image quality of the optical system is good, which meets the requirements of thermal imagers.

Abstract:InSb is an important material for medium wave infrared detectors. To meet the development requirements of larger format high quality infrared focal plane array detectors, the growth of InSb single crystals with diameter of 100 mm and low dislocation density is studied. By improving and optimizing the growth method, seed, necking process and thermal field, a large size low dislocation density InSb crystal with its dislocation density equal to or less than 100 cm-2 and diameter equal to or greater than 100 mm is obtained eventually. The dislocation density of the crystal is distributed uniformly from the top to the end along the crystal rod. It can satisfy the use requirements of large format high quality infrared focal plane array detectors.

Abstract:Multi-layer Insulation (MLI) assemblies have excellent thermal insulation performance in high vacuum environment. Their excellent heat radiation and heat conduction insulation ability can provide an effective thermal protection for infrared opto-electronic equipment. So, they have extremely wide applications in aerospace. The insulation performance of a MLI assembly for space application with duplex aluminized polyester film is mainly tested in the high vacuum environment. The test has provided specific data for an engineering application.

Abstract:To solve the problems of edge blurring and slow convergence speed faced when a traditional neural network method is used in the non-uniformity correction of an infrared focal plane array, the traditional neural network algorithm is improved by introducing the local gradient characteristics of images. By using the weighting function constructed with local gradient similarity information to weight a region, the image edge information can be preserved. In iterative computation, an adaptive weighting factor with gradient amplitude is added to the error loss function, and the adaptive step size associated with the gradient amplitude is introduced to replace the traditional fixed step size. Thus, the correction effect and convergence speed of the algorithm are further improved. Then, the performance curve of the algorithm and its correction result are analyzed. The result shows that the improved neural network correction algorithm has achieved better non-uniformity correction effect than the traditional algorithm. Its correction error is less than that of the traditional method. The object to effectively suppress edge blur and improve convergence speed is realized.

Abstract:The measurement of fluid flow rate and temperature inside pipelines plays an important role in industrial production and engineering applications. A one-dimensional steady-state heat transfer model for high temperature pipelines is used to investigate the variation of temperature of the outer wall of a pipeline with different fluid flow rate and temperature. On the basis of the temperature of the outer wall of a pipeline, a L-M algorithm is used to study the single parameter identification of fluid flow rate and temperature in the pipeline. The influence of temperature measurement point number on the identification result is analyzed. The results show that the fluid flow rate or temperature corresponds to the temperature of the related measurement point. The smaller the fluid flow rate is, the larger the fluid temperature is, and the higher the fluid flow rate identification accuracy is. The larger the fluid flow rate is, the larger the fluid temperature is, and the higher the fluid temperature identification accuracy is. The single parameter identification results of fluid flow rate and temperature are very accurate regardless of the existence of temperature measurement errors.

Abstract:In combination with the engineering applications of image guided weapons, a subpixel correlation tracking method with MEMS-IMU information fusion is proposed. In this method, an error compensation method based on rate measurement is used to compensate the measurement error of MEMS-IMU, so as to achieve the fusion of MEMS-IMU data and image heterogeneous data. Meanwhile, a subpixel correlation tracking algorithm based on template interpolation is employed to improve tracking precision. The result shows that this method not only can well solve the conflict problem between the real-time capacity and the complexity of the algorithm used when the image tracking precision is improved solely by image information, but also can improve the image tracking precision under moving bases effectively.

Abstract:On the basis of the experimentally synthesized WD8 dye, a series of new metal-free dual donor type ME301-ME306 dyes were designed. Both Density Functional Theory (DFT) and Time-dependent Density Functional Theory (TDDFT) were used to further investigate their physical and electronic properties including their molecular structures, IR spectra, energy levels and Light Harvesting Efficiency (LHE). The results showed that the double fluorene donors in ME302 were more promising functional groups. In particular, compared with WD8 dye, ME306 not only had its higher molar extinction coefficient and 50 nm red shift, but also covered the entire visible light range and had a broader absorption spectrum. In addition, ME306 could inject electrons into the TiO2 electrode successfully. The design of this double donor dye could provide new strategies and guidance for the research on high efficiency dye-sensitized cells.