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Zhang X.,Changchun University of Science and Technology | Zhang G.,Changchun University of Science and Technology | Zhang G.,Jilin Province Engineering Research Center | Zhang J.,Changchun University of Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

In order to meet the requirements of multi-color temperature, high precision and wide spectrum, a large number of LED in different colors are used as internal light source for an integrating sphere. An asymmetric Gaussian function model is established to realize non-uniform spectral peak intervals. The research aims to find the desired spectral distribution of LED and the number in use through specific properties of the target spectrum to improve the obtained original fitting model. Simulation of spectral curve of specific color temperature can be realized through the simulation of standard blackbody spectral curve. The result shows that matching simulation error for small band is within 12%, and matching error verified by relative area method is within 4.63%. © 2013 Copyright SPIE. Source


Zhang X.-J.,Changchun University of Science and Technology | Zhang G.-Y.,Changchun University of Science and Technology | Zhang G.-Y.,Jilin Province Engineering Research Center | Sun G.-F.,Changchun University of Science and Technology | And 2 more authors.
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

A scheme of star simulator spectrum simulation based on mixed light source of xenon lamp and halogen tungsten lamp for foundation was proposed. The wide spectrum light source array was composed of xenon lamp and halogen lamp. After color temperature simulation and module controlling, the light entered into the integrating sphere to provide ideal light source for star simulator, and spectral curves were stimulated at specific color temperatures of nearly 3900 K, 4800 K, 6500 K. Through the simulation of the blackbody spectrum curve of standard, the optimal transmission rate was calculated for each band filter, and the transmission rate of interval in tiny brand was combined for getting the transmission rate which satisfied the design index. The simulation results showed that, by using the proposed scheme, the small band matching simulation error would be less than 10%, with the relative area method verification matching error is within 4%, and this scheme provides an effective method for the star simulator to simulate spectral curves of the specific color temperatures. Source


Zhang J.,Changchun University of Science and Technology | Zhang G.-Y.,Changchun University of Science and Technology | Zhang G.-Y.,Jilin Province Engineering Research Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

With continuous development of the key technologies of star sensor, the precision of star simulator have been to be further improved, for it directly affects the accuracy of star sensor laboratory calibration. For improving the accuracy level of the star simulator, a theoretical accuracy analysis model need to be proposed. According the ideal imaging model of star simulator, the theoretical accuracy analysis model can be established. Based on theoretically analyzing the theoretical accuracy analysis model we can get that the starlight emergent angle deviation is primarily affected by star position deviation, main point position deviation, focal length deviation, distortion deviation and object plane tilt deviation. Based on the above affecting factors, a comprehensive deviation model can be established. According to the model, the formula of each factors deviation model separately and the comprehensive deviation model can be summarized and concluded out. By analyzing the properties of each factors deviation model and the comprehensive deviation model formula, concluding the characteristics of each factors respectively and the weight relationship among them. According the result of analysis of the comprehensive deviation model, a reasonable designing indexes can be given by considering the star simulator optical system requirements and the precision of machining and adjustment. So, starlight emergence angle error analysis of star simulator is very significant to guide the direction of determining and demonstrating the index of star simulator, analyzing and compensating the error of star simulator for improving the accuracy of star simulator and establishing a theoretical basis for further improving the starlight angle precision of the star simulator can effectively solve the problem. © 2015 SPIE. Source


Meng Y.,Changchun University of Science and Technology | Zhang G.-Y.,Changchun University of Science and Technology | Zhang G.-Y.,Jilin Province Engineering Research Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Star simulator acts ground calibration equipment of the star sensor, It testes the related parameters and performance of the star sensor. At present, when the dynamic star simulator based on LCOS splicing is identified by the star sensor, there is a major problem which is the poor LCOS contrast. In this paper, we analysis the cause of LC OS stray light, which is the relation between the incident angle of light and contrast ratio and set up the function relationship between the angle and the irradiance of the stray light. According to this relationship, we propose a scheme that we control the incident angle. It is a popular method to use the compound parabolic concentrator (CPC), although it can control any angle what we want in theory, in fact, we usually use it above ±15° because of the length and the manufacturing cost. Then I set a telescopic system in front of the CPC, that principle is the same as the laser beam expander. We simulate the CPC with the Tracepro, it simulate the exit surface irradiance. The telescopic system should be designed by the ZEMAX because of the chromatic aberration correction. As a result, we get a collimating light source which the viewing angle is less than ±5° and the area of uniform irradiation surface is greater than 20mm×20mm. © COPYRIGHT SPIE 2015. Source


Liu S.,Changchun University of Science and Technology | Liu S.,Jilin Province Engineering Research Center | Zhang G.-Y.,Changchun University of Science and Technology | Zhang G.-Y.,Jilin Province Engineering Research Center | And 5 more authors.
Guangzi Xuebao/Acta Photonica Sinica | Year: 2015

In order to meet the requirements of observations of the moon as its target by navigation sensors and rendezvous and docking sensor, the moon simulator with large diameter and high irradiation uniformity was designed, the effective irradiation area is Φ2000 mm. Using LightTools software, the phases, radiance and uniformity of the moon simulator were designed, simulated and analyzed by modeling and tracing method. The phases of the moon and radiance control system was designed to control the 14 typical phases and radiance of the moon in real time. The radiance correction method of the LED array was put forward to improve the uniformity of the simulator. The test results show that the irradiation uniformity of the simulator is better than 15.7% after correction. It indicated that the simulator can be used as the target for sensor identification. ©, 2015, Chinese Optical Society. All right reserved. Source

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