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Focal Length Measuring Technique of Large Aperture and Long Focal Length Mirror

Author: YuanShiDong
Tutor: ZhangWei
School: Harbin Institute of Technology
Course: Optical Engineering
Keywords: Large-caliber Long focal length measurement Talbot effect Moire Fourier transform
CLC: TH744
Type: Master's thesis
Year: 2008
Downloads: 128
Quote: 1
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Abstract


Large-caliber long focal length mirror in astronomical optical systems, aerial remote sensing camera, laser fusion drives and other fields have a wide range of applications. Measurement accuracy of long focal length optical instruments directly affect the use and performance of the full play. Currently, large-caliber long focal length mirror focal length for accurate measurement there is a big problem. In this paper, such components caliber (3 ~ 5m), focal length (30 ~ 50m) characteristics, we propose a long focal length for accurate measurement method, which is based on the Taber (Talbot) effect and Moore (Moire) stripes technical principles. First, analyzes and compares the traditional focal length measurement method, discussed in detail the advantages and disadvantages of each method, combined with the characteristics of the research object and the special requirements of long focal length measurement was proposed based on Talbot effect and moire techniques measurement of large diameter long Focal length of the focal length of the mirror method. Ronchi grating and an example to Talbot effect moiré phenomena and theoretical analysis and simulation. The principle of this method is the formation of Talbot effect Ronchi grating moire moire corner by a large-caliber long focal length to calculate the focal length mirror. Where moire collected by the CCD to the computer, through the fringe image processing to get the exact angle moire. For large diameter, long focal length mirror to its own characteristics, the paper design to achieve the focal length measurement method measurement system, and the feasibility of these designs were fully demonstrated. Meanwhile, the paper also key technologies for the measurement program conducted a detailed study on how to collect moire images, how to calculate the angle and raster moire grating angle are described, and the realization of the fast Fourier angle calculation Transform (FFT) algorithm and pole location algorithm is analyzed in detail; tested against a large diameter lens problems using the scanning method, which can measure the different positions of the focal length of the test lens. Furthermore, a detailed analysis of system accuracy as well as the main factors affecting the accuracy, including the grating period, grating angle, the grating system parameters such as location selection; addition, also discussed the impact of environmental factors focal length measurement accuracy, and focus on analyzing the effect of temperature. Simulation data show measurement error of 0.15% or less, proved that the focal length measurement system for large-diameter telephoto focal length reflector has high measurement accuracy. In this paper, 4m diameter long focal length mirror focal length measurement methods were studied, the method has the optical path is short, simple device, high precision, easy to implement and other characteristics, the results of this paper for large-diameter telephoto focal length mirror measurement developments in this field has a certain reference value.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments
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