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Single-code-channel absolute position encoder

An absolute position and absolute technology, applied in the field of single-channel absolute position encoder, can solve the problem of difficult to achieve large-stroke measurement, achieve fast encoding and high-speed decoding, and solve the effect of limited measurement

Inactive Publication Date: 2014-04-30
HEFEI UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the gray code, pseudo-random sequence, uniform distribution and other absolute position codes commonly used on absolute angle encoders, it is difficult to meet the requirement of infinitely long single code track of the position encoder, and it will be difficult to realize the large-travel measurement required by the factory workshop

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  • Single-code-channel absolute position encoder

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Embodiment Construction

[0043] The principle of the single track absolute position encoder of the present invention is as follows: Figure 6 As shown, it includes two parts: reading system 1 and grating ruler 2. The reading system is composed of an illumination light source 4, a microscopic imaging lens group 5, a CCD photodetector 6 and a photoelectric signal processing module 7; The light beam emitted by the illumination source 4 irradiates the grating scale 2, and the CCD photodetector 6 obtains the coded image information of the engraved line on the coded track 3 through the microscopic imaging lens group 5, and finally obtains the grating displacement after passing through the photoelectric signal processing module 7. The photoelectric signal processing module 7 includes a driving module-identification code-position decoding algorithm.

[0044] The coding mode and the decoding algorithm implementation mode based on the M-ary coding algorithm of the present invention are as follows:

[0045] En...

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Abstract

The invention discloses a single-code-channel absolute position encoder which comprises a grating ruler, a CCD photoelectric detector, a lighting source and a photoelectric signal processing module. The grating ruler is a single-code-channel absolute grating ruler and is provided with a coding engraved rail. The lighting source is arranged below the grating ruler. A microscopic imaging lens set, the CCD photoelectric detector, the lighting source and the photoelectric signal processing module are sequentially arranged above the grating ruler from bottom to top. An absolute encoding code value on the single-code-channel absolute grating ruler is read based on the CCD photoelectric detector; absolute position information of the single-code-channel absolute grating ruler is calculated according to the encoding-decoding algorithm; subdivision of the output absolute position is achieved based on signal output of different pixels of the CCD photoelectric detector. System codes are adopted and can express more grades with shorter code words; in addition, according to features of multi-system codes, fast encoding and fast decoding of system codes can be achieved, and the problem that absolute grating length measurement is limited is solved.

Description

Technical field: [0001] The invention relates to the field of precision measuring instruments, in particular to a single-track absolute position encoder. Background technique: [0002] Grating encoders are widely used in CNC machine tools, precision measuring instruments, automation equipment and other fields, and their performance directly affects the accuracy of machining, measurement testing, and positioning control. [0003] At present, grating encoders for precision displacement measurement mainly include two basic forms: incremental grating encoders and absolute grating encoders. Its measurement standard is a grating ruler with periodic lines, using cheap semiconductor lasers or LEDs as light sources, which has low requirements on the environment and reduces costs. [0004] The principle of the incremental grating encoder system is to use the relative movement of the light source and the grating ruler to modulate the light, and obtain the displacement information by r...

Claims

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Application Information

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IPC IPC(8): G01D5/347
Inventor 夏豪杰刘芳芳于连栋宋奋韬张进邓华夏李维诗
Owner HEFEI UNIV OF TECH
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