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A Compensation Method for Angle Measuring Error of Circular Grating

An error compensation and circular grating technology, applied in the field of circular grating angle measurement error compensation, can solve problems such as high cost and immature commercial products, and achieve the effects of saving costs, improving product reliability, and improving angle measurement accuracy.

Active Publication Date: 2020-09-01
HEFEI UNIV OF TECH
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Problems solved by technology

Inadequacies, when method (1) corrects the angle measurement error of the rotary joint, the influence of ambient temperature on the angle measurement accuracy of the rotary joint has not been considered; method (2) can correct the angle measurement error of the rotary joint in real time, but it needs to arrange many A reading head and high cost; method (3) real-time measurement and compensation for the radial error motion of the rotary joint and the installation eccentricity of the circular grating, but there are no mature commercial products

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  • A Compensation Method for Angle Measuring Error of Circular Grating
  • A Compensation Method for Angle Measuring Error of Circular Grating
  • A Compensation Method for Angle Measuring Error of Circular Grating

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Embodiment Construction

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a circular grating angle measurement error compensation method includes the following steps:

[0030] 1) After placing the circular grating angle measurement system in a constant temperature box 4 at 10°C and waiting for 2 hours, use the photoelectric autocollimator 1 and the hardware data acquisition system to collect the circular grating angle measurement system in combination with the polygonal prism 2 installed on the shaft body 3. Angle data; continue to heat up, measure a set of angle measurement data every 5°C until the set temperature is reached; set the temperature range of the thermostat to 10-40°C. A shaft body is arranged on the rotary joint of the circular grating angle measurement system, and a single reading head is installed on the shaft body.

[0031] 2) Ac...

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Abstract

The invention discloses a circular grating angle measurement error compensation method, which comprises the following steps: obtaining an angle measurement error of a circular grating at different temperatures with a temperature gradient of 5 in a given temperature; establishing a circular grating angle measurement error compensation model at a certain temperature by using a harmonic method; then,establishing a functional relation between the harmonic coefficient and the ambient temperature by using a polynomial method; substituting the function relational expression obtained by polynomial fitting into a harmonic error compensation model to obtain a circular grating angle measurement error compensation model containing a temperature influence factor; and under different temperature gradients, the experiment is repeated to obtain a new angle measurement error, and the compensation effect of the novel circular grating angle measurement error compensation method is verified. The circulargrating angle measurement error compensation method can save cost, improve the angle measuring precision of the rotary joint, and further improve the measuring precision of the portable joint type coordinate measuring device and the reliability of products.

Description

technical field [0001] The invention belongs to the field of measuring instruments, in particular to a circular grating angle measurement error compensation method. Background technique [0002] As a non-orthogonal coordinate measuring instrument, the portable articulated coordinate measuring machine has the advantages of large measurement range, good portability, and light weight. It has been widely used in automobile manufacturing, aircraft assembly, mold manufacturing and other fields. Usually, a portable articulated coordinate measuring machine is composed of 5 to 7 rotary joints connected in series, and a circular grating encoder is installed on each rotary joint to measure the rotation angle of each rotary joint. The angle measurement accuracy of each rotary joint directly affects the measurement accuracy of the portable articulated coordinate measuring machine. How to further improve the angle measurement accuracy of the rotary joint has become the focus of research....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 于连栋鲍文慧刘士达赵会宁贾华坤张润
Owner HEFEI UNIV OF TECH
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