Camouflage effect evaluation is an important content in the development of camouflage technology. In order to make full use of spectral details to evaluate the hyperspectral camouflage effect of targets, a camouflage effect evaluation method based on spectral index is proposed, which has the advantages of visualization and quantitative analysis. In terms of visualization, the hyperspectral image is segmented by spectral index to realize the camouflage effect evaluation of visual interpretation; In terms of quantitative analysis, based on the existing remote sensing spectral indexes, new camouflage spectral indexes are constructed to quantify the spectral characteristics of the target and background, and the spectral consistency coefficient index is proposed to weight and synthesize the spectral indexes, so as to quantitatively evaluate the camouflage effect of the target. The experimental results show that our method can effectively identify the hyperspectral camouflage effect before and after target camouflage, and when the similarity of traditional indicators reaches more than 99%, this method can still effectively identify the target and give an objective evaluation. Its evaluation results are more accurate, comprehensive, scientific and reasonable in terms of the consistency of single spectral segment and the overall matching of wide spectral segment.

In near-shore scenes, under the influence of background, the probability of false detection and low detection accuracy of ship critical parts are high. To address the above problems, this paper proposes a detection network for ship critical parts based on semantic features, which named CPDNet (critical part detection network). Firstly, by optimizing the network structure and adopting attention mechanism, the feature expression ability and the perception ability of the ship's critical parts are improved. Secondly, based on semantic information, a semantic mask module is designed to reduce the impact of background on detection accuracy. In addition, the angle parameter is added to make the network applicable to targets with orientation. Finally, a ship's critical parts dataset, named CP-Ship, is constructed to verify the effectiveness of the proposed network. The experimental results on the CP-Ship dataset show that the average accuracy of the proposed network is 11.35% higher than RetinaNet. Compared with other network models, the proposed network performs well in both detection accuracy and speed.

Research of theoretical modeling and simulation analysis for Fast Steering Mirror (FSM) is carried out to guide the design of FSM effectively. Compared with the single degree of freedom motion model, the multiple degrees of freedom motion differential equation of a two-axis FSM is derived based on the dynamics analysis. The transfer function of the controlled object and rejection of the base disturbance is developed. The influence of the flexible hinge's resonant frequency on the characteristic of the controlled object has been simulated. When the rotation natural frequency is high, the controlled object is an under damped system which has resonance peaks. The simulation model is built for the FSM control system with the structural characteristic. The influence of the bias between the center of mass of the load and the support center of the flexible hinge and the structural resonant frequency on the disturbance rejection characteristic is researched. The disturbance rejection will be better when the non-working axis resonant frequency is higher. The non-working axis resonant frequency should be more than two times of the gain crossover frequency. The working axis resonant frequency should be selected in consideration of the requirement of the disturbance rejection performance and the limitation of the motor torque. Finally, the simulation model is validated via the vibration experiment.

In order to meet the high-precision measurement requirement of spectral emissivity of high temperature material coating, including the stealthy materials, thermal protection materials, heat insulating coat and so on, the measuring methods for normal spectral emissivity of materials at 1 273 K～3 100 K was explored. A measurement model of normal spectral emissivity of materials was established firstly based on the emissivity definition. On this basis, the measurement facility of normal spectral emissivity of materials was built, the wavelength range is 0.7 μm to 14 μm. In order to overcome the technical difficulties of the cavity effect caused by heating the sample in the measuring device, a temperature sample furnace with a movable graphite crucible was developed, and good experimental results were obtained. The normal spectral emissivity of two samples (SiC and low emissivity coating) were measured by this facility. The results show that normal spectral emissivity of two samples decrease with wavelengths and increased with temperature. Finally, the measurement uncertainty of normal spectral emissivity of materials at high temperature was analyzed, the relative expanded uncertainty is 3.6%.

DETR is a target detection algorithm based on transformer, which has the advantages of fast detection speed and good detection effect. A measurement system based on DETR and binocular vision principle for people, cars, bicycles, signal lights and other targets in road environment is introduced. The principles of binocular ranging, camera calibration, target detection and target matching are analyzed, and the measurement system is constructed on this basis. The target detection algorithm is used to detect the target in the field of vision, and the principle of binocular vision is used to measure the distance of the detected target. The source of measurement error in the measurement system is analyzed and the influence on the results is calculated. The algorithm is tested in Kitti data set and real environment. The system baseline is 45 cm, the detection rate of 15-80 m specified target is higher than 90.6%, and the ranging error is less than 5.8%. The algorithm in this paper runs on RTX 2080ti platform and can run in real time.

A scheme for coherent noise suppression by an off-axis illumination system is proposed. An illumination system with the ability to suppress coherent noise is designed, and the illumination system is simulated by the non-sequential mode of Zemax to obtain an off-axis annular light spot with a thickness of 90 μm. To verify the ability of this illumination system to suppress coherent noise, it is used as the light source of a 3/4-inch Fizeau interferometer, and a comparison experiment is set up with a light source wavelength of 632 nm, and circular noise spots of size 120~500 μm and scratches of 100×350 μm are set. Error analysis of this illumination system was performed to optimize the imaging quality of the illumination system and adjust the parameters of the interferometric system, and finally, the contrast of the interference fringe was improved to 97.60% with illumination light of 42 μm ring thickness and an interference cavity length of 15 mm.

This paper designs an optical system for panoramic surveillance cameras that can achieve clear all-weather imaging. Using a panoramic annular structure, the structure is divided into two parts: camera head unit and relay lens unit. The camera head unit completes the full field of view target search, The relay lens unit performs secondary imaging of the intermediate virtual image formed by the head unit and converges it on the detector. The design adopts multiple structural optimization methods to achieve visible light and near-infrared dual band imaging. The field of view of the optical system is 360°×（40°~100°）, the focal length is −2.75 mm, and the number of F is 3.28. The modulation transfer function (MTF) value of design results is close to the diffraction limit at the full field of view, The diffuse spot radius of each field of view is less than the selected CCD pixel size, The distortion is less than ±2%, and the day and night defocus is less than 0.002 mm, The design results well meet the requirements of all-weather panoramic monitoring.

Low illumination night vision equipment based on CMOS devices has good concealment and lower cost than infrared thermal imaging equipment. It is an important means to expand human visual perception under low illumination conditions and widely used in military and civil fields. In order to meet the requirements of equipment maintenance and support under the condition of low illumination at night, a large field of view low illumination night vision goggle optical system is designed. By selecting the appropriate optical glass material, it has a good spectral response in the visible/near infrared band. The designed large relative aperture eyepiece has a field of view angle of 74.46°, focal length of 46mm, F# 1.2, distortion less than −7.14%, total length of the system less than 80mm and lens weight less than 100g. Under the spectral range of 486 ~ 950nm, the eyepiece can meet the maintenance, training and scene observation under the condition of no lighting at night, which provides a new technical means for the development of optical module of low illumination night vision headwear system.

Ultraviolet (UV) image intensifiers are widely used in corona detection, strategic national defense, scientific research and other fields. However, due to the lack of available materials for the UV optical lens and the difficulty of chromatic aberration correction, it is difficult to meet the needs of wide spectrum. The applicability of single-layer diffractive optical element (SLDOE) and double-layer diffractive optical element in broadband UV optical system is analyzed. A set of UV optical systems with wide spectrum and high resolution are designed respectively. The working wavelength range of the single-layer diffractive UV optical system is 230 nm~280 nm, and the modulation transfer function (MTF) value at the cut-off frequency of 60 lp·mm⁻¹ is better than 0.47; the working wavelength range of the double-layer diffractive UV optical system is 200 nm~ 400 nm, MTF value at the cut-off frequency of 60 lp·mm⁻¹ is better than 0.49. The design results show that DOE can effectively correct the chromatic aberration of the UV spectrum. Compared with the existing wide spectrum UV system, the optical systems are relay imaging systems with wider UV spectral range and higher imaging resolution in this paper.

As an important accessory of the high and low temperature test device of the photoelectric imaging system, the optical window assembly is assembled on the side of the high and low temperature test box. Combined with the comprehensive detector of the photoelectric system outside the box, it is used to detect the performance index of the photoelectric imaging system under high and low temperature conditions. It is an important part of the high and low temperature performance detection device of the photoelectric imaging system. According to the application requirements and material analysis, multispectral ZnS is selected as the optical window material to meet the performance index detection requirements of multispectral photoelectric system; Through the heat conduction theory, the low-temperature service state of the optical window module is analyzed, focusing on the influence of the heating of the window module under the low-temperature condition on the surface shape of the window module, and the structural form to realize the micro stress assembly and the design scheme to solve the frost and fog of the window module under the low-temperature condition are put forward; The finite element calculation results are extracted, processed and combined by sigfit, and the caliber is analyzed by code v φ The wave aberration RMS of 310mm window module in the temperature range is better than that of λ/ 15. They all meet the optical performance requirements of window components and have been verified by the physical prototype. Therefore, the structural design scheme of the multispectral optical window assembly not only meets the requirements of multi band use, but also meets the requirements of low-temperature defrosting and defogging, and ensures the optical performance requirements under high and low temperature conditions.

The zoom optical system is not only suitable for daily life such as photography, surveillance and microscopy, but also widely used in aerospace and national defense construction. With the expansion of the application range, there are more and more requirements for its performance indicators. This design realizes a 15 mm~300 mm wide spectrum four component continuous zoom optical system. The system uses a positive group compensation structure to achieve 20 times optical zoom, it can work in the spectrum range of 450nm~900nm, and the working temperature range is − 40 ℃~ 60 ℃. It uses 18 spherical glass lenses with a total length of 160mm, a maximum aperture of 66 mm, a long focal F number of better than 5, the system has compact structure and miniaturization requirements. In the visible light band, realize the modulation transfer function (MTF) of the central field of view >0.4@145 lp/mm, MTF of full field of view >0.2@145 lp/mm. In the near infrared band, MTF of the central field of view >0.4@60 lp/mm and MTF of full field of view >0.2@60 lp/mm. From the design results, the design meets the requirements of high performance index, and has certain reference significance for the design of zoom optical system with wide spectrum, large zoom ratio and miniaturization.