Grating displacement detection method based on pixel coding
A detection method and a grating displacement technology, which are applied in the field of measuring instruments, can solve problems such as unutilized image processing technology, and achieve the effect of solving the contradiction between speed and accuracy, avoiding zero-returning operation, and overcoming the limitation of manufacturing accuracy.
Inactive Publication Date: 2020-05-08
GUANGDONG UNIV OF TECH
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[0006] The above invention adopts the combination of grating ruler and image acquisition module, but does not use more image processing technology
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[0049] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.
[0050] 1. a grating displacement detection method based on pixel coding, it is characterized in that, described detection method comprises the following steps:
[0051] S1. Grating ruler feature marks;
[0052] S2. raster image acquisition;
[0053] S3. Raster image segmentation;
[0054] S4. Grating feature information extraction and determination;
[0055] S5. Grating mark pixel...
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The invention discloses a grating displacement detection method based on pixel coding. The detection method comprises the steps of: S1, grating ruler characteristic marking; S2, grating image acquisition; S3, grating image segmentation; S4, grating characteristic information extraction and judging; S5, grating mark pixel position coding; and S6, acquisition of an actual position of a to-be-retrieved grating. According to the detection method, the defects that pulses of an incremental circular grating ruler are prone to falling off at a high speed and zero returning operation needs to be conducted after power failure are overcome, the problem that an absolute grating ruler and the incremental grating ruler need to be used in cooperation at the same time is solved, and the defect that the grating ruler is high in cost in the high-precision measurement process is overcome. According to the invention, characteristic marking is carried out on the incremental grating ruler, and the marked content is coded. The incremental grating ruler is converted into an incremental absolute grating ruler, so that the rapidity and the stability of the incremental grating ruler are kept, and the operation that the incremental grating ruler needs to return to zero is avoided.
Description
technical field [0001] The present application relates to the technical field of measuring instruments, in particular to a method for detecting grating displacement based on pixel coding. Background technique [0002] Grating rulers are often used in closed-loop servo systems of CNC machine tools and can be used to detect linear displacement or angular displacement. The essence of the grating detection displacement is to measure the position weighing with the grating pitch as a standard ruler. High-resolution grating scales are generally more expensive and difficult to manufacture. In order to improve the system resolution, electronic subdivision methods are traditionally used. When two gratings overlap at a small inclination angle, moiré fringes will be generated in the direction roughly perpendicular to the grating lines, and as the grating moves, the moiré fringes will also move up and down. The measurement is thus subdivided to obtain the grating pitch. [0003] Grat...
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CPCG01B11/02
Inventor 潘雅灵黄观新陈新林博生朱苗杨志军
Owner GUANGDONG UNIV OF TECH