Visual absolute type rotation anglemeasurement method and device

A technology of rotation angle and measurement device, which is applied in the direction of measurement device, optical device, image data processing, etc., to achieve high reliability, small rotation angle measurement resolution, and low computational complexity

Active Publication Date: 2021-02-12
SICHUAN WINDOM PHOTOELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a visual absolute rotation angle measurement method and device to solve the above-mentioned problems existing in the measurement of the grating ruler

Method used

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  • Visual absolute type rotation anglemeasurement method and device
  • Visual absolute type rotation anglemeasurement method and device
  • Visual absolute type rotation anglemeasurement method and device

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Experimental program
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Embodiment

[0057] like Figure 1-2As shown, the present embodiment proposes a visual absolute rotation angle measuring device, comprising a CCD camera 1 and an annular code wheel 2, the middle part of which is connected to a rotating shaft 4 to rotate;

[0058] On the ring of the code disc 2, there are n co-circular gray marks 3 evenly distributed, and the gray value of each gray mark 3 corresponds to n-level gray marks set at uniform intervals in the gray value range of 0-255. degree value;

[0059] The CCD camera 1 is set above the code wheel 2, so that its shooting field of view is aligned with the gray mark 3, and there is at least one complete gray mark 3 in its shooting field of view at any moment.

[0060] Taking n=8 as an example to further illustrate the present invention, see figure 1 , the gray mark 3 has a total of 8, all of which are solid circles with different gray values ​​and share a circle. These 8 grayscale markers 3 are numbered as 0, 1, 2, 3, 4, 5, 6, 7 in order o...

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Abstract

The invention provides a visual absolute type rotation angle measurement method and device, and the device comprises a CCD camera and an annular code disc, and the middle part of the code disc rotatesthrough a connection rotating shaft; n concyclic gray scale identifiers are uniformly distributed on a circular ring of the code disc, and the gray scale value of each gray scale identifier corresponds to n stages of gray scale values which are uniformly set at intervals in a 0-255 gray scale value interval; and and the CCD camera is arranged above the code disc, the shooting visual field of theCCD camera is aligned with the gray scale identifiers, and at least one complete gray scale identifier exists in the shooting visual field of the CCD camera at any moment. The measurement device provided by the invention has absolute positioning capability and extremely low rotation angle measurement resolution.

Description

technical field [0001] The invention relates to the technical field of angle measurement, in particular to a visual absolute rotation angle measurement method and device. Background technique [0002] The precise measurement of plane movement distance is a common general requirement, which is often used in the closed-loop servo system of CNC machine tools, and can be used for the detection of linear displacement or angular displacement. At present, the grating ruler is mainly used for measurement in the industrial field, which is also called a grating ruler displacement sensor or a grating ruler sensor, which is a measurement feedback device that works by using the optical principle of the grating. [0003] There are mainly two types of materials for making gratings: [0004] 1. Engraved glass ruler (used when the effective measurement length is less than 3 meters) [0005] 2. Graduated steel tape ruler (used when the effective measurement length is more than 3 meters) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26G06T7/11G06T7/136G06T7/66G06T7/70G06T7/80
CPCG01B11/26G06T7/70G06T7/80G06T7/11G06T7/136G06T7/66
Inventor 王德麾姜世平杨武代冬军郑鑫力昌兵
Owner SICHUAN WINDOM PHOTOELECTRIC TECH
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