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Yang L.,Xian Technological University | Xie H.,Xian Institute of Applied Optics | Su J.,Xian Technological University
Journal of Applied Optics | Year: 2014

The determination method of laser damage of thin film and the evaluation method of damage threshold are indispensable for enhancing anti-laser ability of infrared system observation window and its operating performance. The damage characteristics and mechanism of film by pulse laser induced damage were researched. The experiments used by YAG pulsed laser for TiO2 thin film were offered for 1-on-1 way of laser induced. By using the two images taken from charge coupled device (CCD) before and after laser illumination, the matching of the damaged image and the undamaged image was realized, and the difference image measure algorithm was established. The experiments conclude that the different energy measures of TiO2 thin film samples can identify the damage situation: the measure value M<0.1, no damage; 0.10.5, serious injuries. The roughness of thin film samples irradiated by the laser with the energy density of 0.5 J/cm2 increases obviously. The results show that the method of image matching test before and after laser irradiation can realize discrimination of laser-induced film damage. ©, 2014, The No.205 Research Institute of China Ordnance Industry. All right reserved. Source

Ji X.-H.,Xian Technological University | Yang L.,Xian Technological University | Jiang L.,Xian Institute of Applied Optics
Journal of Applied Optics | Year: 2013

To calibrate the optical axis consistence of airborne multi-spectral and multi-axial optoelectronic tracking device fast and accurately, a calibration system for the consistence of optical axis based on Cassegrain optical system was designed. This system used halogen lights as the visible light source, blackbody as the infrared light source, and ZnS reticle was adopted to provide infinite object. The aperture of the system was 200 mm, and the focal length was 1500 mm. The emergent beam parallelism of points on the axis was better than 10″, satisfying the demand of 1' in the test of consistence of multi-optical axis and multi-spectrum system. Source

Yang H.-C.,Xian Institute of Applied Optics | Wang Z.-L.,Xian Institute of Applied Optics
Journal of Applied Optics | Year: 2013

The aiming axis could affect the angle measurement accuracy of panoramic periscopic system. According to the typical opto-mechanical structure of the panoramic periscopic system, the error sources of aiming axis precision were analyzed. The calculation model was established by using the vector reflection theory and rotation principle, and the influence of azimuth axis, pitch axis, optical axis and reflector errors on the aiming axis was provided clearly. Meanwhile, the corresponding adjustment scheme was determined, each control point in the adjusting process was made clearly, and the debugging and testing methods were also determined. The test results show that the aiming axis accuracy is up to 0.1 mrad. Source

Liu Y.,Xian Institute of Applied Optics | Guo C.,Xian Institute of Applied Optics | Ru Z.-B.,Xian Institute of Applied Optics
Journal of Applied Optics | Year: 2014

A design of a 3rd generation image intensifying charged-coupled device camera (ICCD) was proposed that could operate under high-speed gating. A gated control circuit was designed which was used for the photocathode of a 3rd generation image tube, so that the ICCD could image effectively under a high-speed gated state. After analysis and comparison, a relay lens was designed which had a Bi-Gauss complication optic configuration. The high transmissivity and high modulated transfer function (MTF) were achieved on image coupling. A digital CCD and a digital frame capture circuit with an embedded image process module were used. The correlative software about the image process was accomplished, so that the image of ICCD was presented fast. As a result of the design, the 3rd gated ICCD can operate with a 3.3 ns gated width and its spatial resolution is 600 TVL. Source

Qu J.-R.,Xian Institute of Applied Optics | Wang X.-Q.,Xian Institute of Applied Optics | Duan H.-J.,Xian Institute of Applied Optics
Journal of Applied Optics | Year: 2014

Aiming at the photoelectronic tracking system marched weapon systems, we expounded the considerations for its demonstration and design, discussed the selection principle for the detector of the optoelectronic tracking system as well as the advantages/disadvantages of the T-model and U-model structures from the actual situations. Moreover we analyzed the main factors determining the critical indicators such as tracking distance, tracking precision, response speed and working scope. Corresponding to the critical indicators, we also determined the factors influencing the indicators of EO system inside. Furthermore we proposed some related techniques, including guiding interception function, relationship among optical axes, and so on. Source

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