Time filter

Source Type

Changchun, China

Yan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yan L.,University of Chinese Academy of Sciences | Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zheng L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

In order to solve the problem evaluating the stitching accuracy of large-diameter reflecting mirror, a kind of stitching accuracy evaluating method called self-test was proposed in the article, realizing the analysis and evaluation to the stitching accuracy of large-diameter reflector mirror, while providing a method measuring the stitching precision. Self-test was a kind of method testing the accuracy of stitching result with sub-aperture measuring result. In the article, relative accuracy evaluation indexes and their calculation methods were discussed. As a project example, φ800 mm plane mirror was splicing measured with a φ600 mm interferometer and stitching accuracy was evaluated with the self-test method. It shows that the stitching is accurate and it's reliable and precise to assess stitching accuracy by the way of self-test at the same time.

Jiang W.,Changchun UP Optotech Co. | Wang H.-W.,Changchun Region Office of Military Representative
Corrosion and Protection | Year: 2010

A black delustering and conducting film was prapered by hard anodic oxidation and conductive oxidation. The oxide film could satisfy the requirements of wear resistance, optical and electric properties for optical instrument with high precision, and the process-cycle and difficulty of machining work were reduced.

Yang Z.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang Z.-L.,University of Chinese Academy of Sciences | Chen Y.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shan X.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Chinese Journal of Liquid Crystals and Displays | Year: 2016

In order to acquire synchronously and transfer four channels signal outputted by quadrant detector, a high-resolution, high-rate synchronous data acquisition and transmission system is designed. Firstly, an FPGA chip named EP1C12Q240 is selected as the core to control the acquisition of AD (ADS1274) and buffer data into FIFO on chip. Then the data is packaged into images consist of 32×40 pixels according to Camera Link protocol, and transferred to PC via Camera Link interface. Finally, the images are acquired by image acquisition, decoded using software programmed with MATLAB, and stored in PC. Experimental results show that the system, whose effective resolution is up to 18.79 bit, achieves a resolution of 24 bit, sampling rate of 100 kHz and 4-channel synchronous data acquisition, and can transfer data stably and reliably. The system meets the requirements of high resolution, high sample rate and synchronous acquisition. In addition, it has good scalability and could be ported to other applications. © 2016, Science Press. All rights reserved.

Li L.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li L.-Y.,University of Chinese Academy of Sciences | Wang Y.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang J.,Changchun UP Optotech Co.
Chinese Optics | Year: 2011

Varifocal optical system can meet the requirements of dynamic optical systems by changing optical parameters of optical components to adjust optical paths. This paper firstly introduces the fundamentals of varifocal optical system, and describes the design of the varifocal optical systems based on optical compensation and mechanical compensation. Then, it elaborates the type and structures of common focusing mechanisms and analyzes their advantages and disadvantages. It points out that along with the DSP control technology and stepping motor development, the varifocal optical mechanism has entered a new prospect. By making a reference to domestic and international engineering applications, the research shows that the numerical control technology based on stepping motors and DSP has an extensive forecast on varifocal optical mechanisms in the range equipment.

Gu Z.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gu Z.-Y.,University of Chinese Academy of Sciences | Yan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li X.-B.,Changchun UP Optotech Co. | And 3 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2015

To calculate the misalignments of optical elements accurately in an off-axis Mersenne afocal Cassegrain telescope, a computer-aided alignment method based on modified sensitivity matrix model was proposed. The principle and limitations of conventional sensitivity matrix method were analyzed. By means of adding a quadratic correction term to conventional sensitivity matrix model, the conventional computer-aided alignment technology was improved. For the off-axis telescope, the aberration characteristics were analyzed when the secondary mirror was misaligned. The modified model and conventional model were used to approximate the mapping relationships between misalignments and aberrations. Then the alignment of misaligned telescope was simulated. The simulation results in the range of decenter ±8 mm and tilt ±1.5° for a secondary mirror show that the root mean square error of x-, y-, z-decenters and α-, β-tilts of the secondary mirror calculated by conventional method are 2.689 mm, 2.494 mm, 0.194 mm and 0.500°, 0.525° respectively, and the corresponding calculations by modified method are 0.404 mm, 0.323 mm, 0.047 mm and 0.064°, 0.065° respectively. The calculation accuracy of the modified sensitivity matrix method is much higher than that of the conventional method. Finally, the telescope is well aligned with the modified method, and the results give that the Wavefront Errors (WFEs) RMS on axis is 0.056λ(λ=632.8 nm), while the WFEs RMS (Root Mean Square) in marginal field of view are better than 0.1λ. The results meet the design requirements. ©, 2015, Chinese Academy of Sciences. All right reserved.

Discover hidden collaborations