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Xiao Z.,Changchun University of Science and Technology | Han D.,Changchun University of Science and Technology | Zhu H.,Jilin Dongguang Precision Machinery Factory | Wang L.,Military Representative Room of Armored Forces in Changchun | Xu Z.,Jilin Dongguang Precision Machinery Factory
Optik | Year: 2016

According to accuracy requirements of aerial camera focusing and characteristics of CCD camera imaging, this paper proposed automatic focusing system of aerial camera based on image processing technology. Firstly, in accordance with self-made resolution target, image sharpness function and optimization of hill climbing algorithm, autocollimation defocusing compensation method was used to achieve correction of the aerial camera defocus caused by temperature and atmospheric pressure. Then the amount of defocus was calculated by introducing the aircraft height data, and defocus adjustment was realized by appropriate device. Finally, the experiment was carried out for simulating and testing of the system, and the results showed that: error of the system for camera defocusing correction is less than half of the camera focal depth, which can meet the requirements of the aerial camera, such as fast, high-precision focusing and so on. © 2015 Elsevier GmbH. All rights reserved. Source


Fu X.-H.,Changchun University of Science and Technology | Xiong S.-F.,Changchun University of Science and Technology | Kou Y.,Changchun University of Science and Technology | Pan Y.-G.,Changchun University of Science and Technology | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

With the rapid development of optical testing technology, laser heterodyne interferometer has been used more and more widely. As the testing precision requirements continue to increase, the technical prism is an important component of heterodyne interference. The research utilizing thin film technology to improve optical performance of interferometer has been a new focus. In the article, based on the use requirements of interferometer beam splitting prism, select Ta2O5 and SiO2 as high and low refractive index materials respectively, deposit on substrate K9. With the help of TFCalc design software and Needle method, adopting electron gun evaporation and ion assisted deposition, the beam splitting prism is prepared successfully and the ratio of transmittance and reflectance for this beam splitting prism in 500∼850 nm band, incident angle 45 degree is 8:2. After repeated tests, solved the difference problem of film deposition process parameters,controlled thickness monitoring precision effectively and finally prepared the ideal beam splitting prism which is high adhesion and stable optics properties. The film the laser induced damage threshold and it meet the requirements of heterodyne interferometer for use. © 2014 SPIE. Source


Xiao Z.J.,Changchun University of Science and Technology | Guo X.X.,Changchun University of Science and Technology | Zhu H.B.,Jilin Dongguang Precision Machinery Factory | Xu Z.G.,Jilin Dongguang Precision Machinery Factory | An Z.Y.,Changchun University of Science and Technology
Advanced Materials Research | Year: 2014

In view of characteristics owned by high and low gimbals, for instance pure lag, large inertia, strongly nonlinear and so on, which was employed in low light level (LLL) weapon sight reliability detection system. The basic working principle and mathematical model of Dahlin and Smith predictive control algorithm were mainly researched. And ideal control curves were obtained by software emulation. The simulated results showed that the two algorithms each have their advantages, shortcomings and the proper situations, but as to improve the control efficiency of system, the Dahlin is superior. © (2014) Trans Tech Publications, Switzerland. Source


Xiao Z.,Changchun University of Science and Technology | Guo X.,Changchun Architecture and Civil Engineering College | Zhu H.,Jilin Dongguang Precision Machinery Factory | Xu Z.,Jilin Dongguang Precision Machinery Factory | An Z.,Changchun University of Science and Technology
Optik | Year: 2016

The environmental adaptability is one of the key factors to evaluate the operational performance of low-light-level sight. In this paper double-integrating-sphere in illumination-mode combined with collimator was adopted to design a simulated generator of infinite target in order to provide four different level light stresses environment needed for detecting the adaptability for low-light-level sight. First of all, for the actual application of the low-light-level sight in aiming and positioning at night and midnight, the illumination at the entrance pupil of the sight was calculated. And then the double-integrating-sphere and collimator were designed in accordance with the illumination. Finally, the output illumination of integrating sphere and simulated generator for infinite target simulation were analyzed and calculated, the results of experiment and measuring showed that the illumination non-uniformity is less than 2%, which can satisfy the application requirements. © 2015 Elsevier GmbH. Source


Xiao Z.-J.,Changchun University of Science and Technology | Guo X.-X.,Changchun University of Science and Technology | Zhu H.-B.,Jilin Dongguang Precision Machinery Factory | Xu Z.-G.,Jilin Dongguang Precision Machinery Factory | An Z.-Y.,Changchun University of Science and Technology
Guangzi Xuebao/Acta Photonica Sinica | Year: 2015

According to scene illumination under night sky radiation, when shooters were aiming and positioning at night, the illumination at the entrance pupil of the sight was calculated, and the generating device for infinite target simulation based on double-integrating-sphere in illumination-mode was designed in accordance with the illumination. Variable diaphragm applied to offer four switchable low light stress environments for the night vision device according to the principle of the integrating sphere, which was setting between the double-integrating-sphere. Meanwhile, for the sake of the maximum illumination could be received by the Low-Light-Level sight during the test, the installation position of the sight relative to collimator was analyzed. The results show that the three crucial factors which influenced the illumination at its entrance pupil are scilicet the clear aperture of the iris diaphragm setting between the double-integrating-sphere, the field of view of the collimator, and the installation position of the Low-Light-Level weapon sight apart from the collimator objective. Finally, the output illuminance of the integrating sphere and generating device were analyzed and calculated, the results of experiment and measuring showed that the illumination non-uniformity is <2%, which can meet the application requirements. ©, 2015, Chinese Optical Society. All right reserved. Source

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