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Single code track absolute linear displacement grating ruler virtual incremental code track construction method and decoding method

A technology of construction method and decoding method, applied in the field of virtual incremental code channel construction of single-code-channel absolute linear displacement grating ruler, can solve the problem of poor anti-interference ability, lack of virtual incremental code channel technology, affecting the grating ruler Accuracy and other issues to achieve the effect of reducing the probability of reading errors

Inactive Publication Date: 2015-10-28
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

There are two basic problems in this method: one is that it cannot do subdivision processing, which affects the accuracy of the grating ruler; the other is that the anti-interference ability is poor
However, the two physical code tracks must be aligned, which has high requirements on the processing technology and increases the manufacturing cost of the grating ruler
At present, there is no report on virtual incremental code channel technology

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  • Single code track absolute linear displacement grating ruler virtual incremental code track construction method and decoding method
  • Single code track absolute linear displacement grating ruler virtual incremental code track construction method and decoding method
  • Single code track absolute linear displacement grating ruler virtual incremental code track construction method and decoding method

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Embodiment Construction

[0022] The virtual incremental code track is a signal composed of a series of pulses generated by a signal processing method using the information obtained from the absolute code track of the single-track absolute linear displacement grating ruler. It is mainly used in the design and manufacture of single-track absolute linear displacement grating scales, to replace physical incremental code tracks, to realize the subdivision processing of single-code track absolute linear displacement grating scales, and to provide a new reading and The decoding method overcomes the error-prone shortcomings of the grating ruler reading and improves the reliability.

[0023] At present, the reading of the single-channel absolute linear displacement grating scale is based on the video signal output by CCD (or CMOS), and the absolute code is obtained through binarization. Since the processed signal is a binary digital signal, it cannot be subdivided. In addition, the video signal is easily affe...

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Abstract

The invention relates to a virtual incremental code channel construction method and a decoding method for a single-code-channel absolute linear-displacement grating ruler. A virtual incremental code channel is a signal formed by a string of pulses which are generated by a signal received by an absolute code channel. Each pulse in the string of pulses is generated by a reading head which passes through a pitch and the width of each pulse corresponds to the pitch of the grating ruler. By using the decoding method based on the virtual incremental code channel, the probability of reading errors caused by pollution of scales of the grating ruler is greatly reduced and the goal of subdivision processing can be realized.

Description

technical field [0001] The invention belongs to the field of optical metrology, and relates to a construction method and a decoding method of a virtual incremental code track of a single track absolute linear displacement grating ruler. Background technique [0002] The single-track absolute linear displacement grating scale is a kind of grating scale belonging to the international advanced level, which is used for high-end precision machine tools. In the world, only a few countries such as Germany, the United States, and Japan have mastered this technology. Due to technical confidentiality reasons, there is no similar product in China, and it is still in the research and development stage. [0003] At present, the reading of the single-track absolute linear displacement grating is based on the video signal of the absolute track. There are two basic problems in this method: one is that it cannot do subdivision processing, which affects the accuracy of the grating ruler; th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/347
Inventor 刘峰彭济根刘红忠
Owner XI AN JIAOTONG UNIV