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Method for measuring engineering collimation parameters of accelerator

A measurement method and accelerator technology, applied in the direction of measurement devices, instruments, optical devices, etc., can solve the problems of Newton's method relying on initial values, generating deviations, and the robust solution method does not have automatic weighting, so as to improve calculation efficiency and accuracy Effect

Active Publication Date: 2018-09-07
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the measurement method of collimation parameters, Tsinghua University’s invention patent target measurement points can only take 3 points, obviously there is not enough redundant observations, and the measurement accuracy is not high
The invention patent of Zhejiang University uses the least square error as the objective function, and uses the Newton method to solve the optimization problem, but the Newton method is too dependent on the initial value and should not converge
The commercial software Spatial Analyzer uses the damped least squares method to solve the collimation parameters at large angles. However, deviations will occur when the origin of the coordinate system deviates from the center of the component, and its robust solution method does not have automatic weighting, and the solution efficiency and accuracy are low. not tall

Method used

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  • Method for measuring engineering collimation parameters of accelerator
  • Method for measuring engineering collimation parameters of accelerator
  • Method for measuring engineering collimation parameters of accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Example 1: Calculation of large angles by damped least squares method

[0124] Case 1 has a theoretical value and belongs to a large angle, so the damped least square method is used to calculate and compare with the theoretical value. The specific results are shown in Tables 1 and 2.

[0125] Table 1 Method 1 test data table

[0126]

[0127] Table 2 Method 1 Collimation parameter calculation value error and its comparison table with theoretical value

[0128]

Embodiment 2

[0129] Embodiment 2: Calculation of coordinate system eccentricity by structure overall least squares method

[0130] The coordinate system of Case 2 is eccentric, so it is calculated according to the overall least squares method of the structure. See Tables 3, 4, and 5 for details.

[0131] Table 3 method 2 test data table

[0132]

[0133] Table 4 Method 2 test data translation statistics table

[0134] dot

DX(mm)

DY(mm)

DZ(mm)

1

0.11

-0.42

-5.9

2

0.24

-0.28

-5.92

3

0.01

-0.41

-6.31

4

-0.68

-0.02

-6.15

5

-0.61

0.07

-6.15

6

-0.62

-0.18

-6.5

7

-0.46

-0.13

-6.5

average value

-0.29

-0.2

-6.2

median

-0.46

-0.18

-6.15

[0135] Table 5 Method 1 Collimation parameter calculation value error table

[0136]

Embodiment 3

[0137] Example 3: Quasi-stable estimation method with gross errors

[0138] Gross error cases are calculated according to pseudo-stable estimates, and the specific results are shown in Tables 6, 7 and 8.

[0139] Table 6 Method 3 test data table (no gross error)

[0140]

[0141] Table 7 Method 3 test data table (gross error)

[0142]

[0143] Table 8 Method 3 with or without gross error calculation parameter result comparison table

[0144]

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Abstract

The invention relates to the technical field of precision engineering and industrial measurement, and particularly relates to a method for measuring engineering collimation parameters of an accelerator. The method is characterized in that a coordinate transformation relation between a calibration theoretical value and a measured installation value of mechanical equipment is established, and attitude parameters of the equipment are solved according to a singular value decomposition method, so that a problem of collimation parameter solving under the conditions of a large angle, eccentricity ofa coordinate system and existence of gross errors is solved by adopting a damped least squares method, a structured total least squares method and a quasi-stable estimation method. The method can be used by being matched with a laser tracker, a portable measuring arm or a total station instrument so as to complete the calculation of the calibration parameters; the collimation parameters can be calculated at any angles; the collimation parameters can be accurately calculated without moving a coordinate system when the coordinate system is eccentric; and the collimation parameters can be calculate without the loss of precision when there is a gross error. The method improves the calculation efficiency and precision and has robustness.

Description

technical field [0001] The invention relates to the technical fields of precision engineering and industrial measurement, in particular to a method for measuring collimation parameters of accelerator engineering. Background technique [0002] At present, in the digital installation of large-scale projects such as aerospace, automobile manufacturing, accelerators, and radio telescopes, most of the high-precision total stations, laser trackers, photogrammetry and other instruments are used. The collimation parameters (3 translations, 3 The correctness and reliability of a rotation amount) are particularly important. However, in the measurement method of collimation parameters, Tsinghua University's invention patent target measurement points can only take 3 points, obviously there is not enough redundant observations, and the measurement accuracy is not high. The invention patent of Zhejiang University uses the least square error as the objective function, and uses the Newton ...

Claims

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Application Information

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IPC IPC(8): G01B11/27
CPCG01B11/272
Inventor 袁建东张斌姚俊杰孙国珍王锋锋蔡国柱王少明陈文军
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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