Pseudo random code track grating ruler and reading method thereof

A pseudo-random code and grating scale technology, which is applied in the field of grating scale position measurement, can solve the problems of increased technical complexity, disadvantageous application of grating scales, complex grating scale measurement, reading and calculation structures, etc. Small, easy-to-install effect

Pending Publication Date: 2018-08-03
GSK CNC EQUIP
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Problems solved by technology

The code channels used in this patent are multi-dimensional multiple pseudo-random code channels. As the range increases, the number of code channels will also increase, which causes the problem of complex overall measurement, reading and calculation structures of the grating ruler; in addition, the encoding method It adopts full-scale coding. Th

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  • Pseudo random code track grating ruler and reading method thereof
  • Pseudo random code track grating ruler and reading method thereof
  • Pseudo random code track grating ruler and reading method thereof

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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings. In the present invention, the following definition values ​​are made for the following symbols: the value of n is the cycle number 2 of the incremental code channel contained in each segment length of the main pseudo-random code channel M n+1 ;addr is the storage address; D (n) is the highest digit of the pseudo-random code; f is the scale factor of the sub-scale; M is the main pseudo-random code track; S is the pseudo-random code of the sub-scale; N is the difference between the reading value S of the sub-scale minus the reading value M of the main scale; XF is Incremental subdivision value.

[0041] The encoding method of the pseudo-random code among the present invention:

[0042] The first step is to establish a pseudo-random code table. Pseudo-random code table is set with 2 n+1 storage address, the storage address is addr0 to addr...

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Abstract

The invention discloses a coding method of a pseudo random code track grating ruler, the pseudo random code track grating ruler made by using the coding method of the pseudo random code track gratingruler and a method for reading the pseudo random code track grating ruler. The pseudo random code track grating ruler includes a linear guide rail, a reading head and a pseudo random code track grating ruler body; the pseudo random code track grating ruler body includes a main ruler, a vice ruler and an incremental code track; the code tracks of the main ruler and the vice ruler are grating grooves which are arranged continuously at non-equal internals and are arranged according to the coding method, and the incremental code track is periodic grating grooves which are arranged continuously atequal internals. The grating ruler is high in resolution ratio and large in range capacity, the startup identification position distance is short, a mathematical derivation method of an absolute valuecode track is simple, and the manufacturing technique of products is simplified.

Description

technical field [0001] The invention relates to the research field of grating ruler position measurement technology, in particular to a pseudo-random code track grating ruler and a reading method thereof. Background technique [0002] The grating ruler is a measurement feedback device that uses the optical principle of the grating. Grating rulers are often used in the closed-loop servo system of CNC machine tools for the detection of linear displacement or angular displacement. The signal output by the grating ruler is a digital pulse, which has the characteristics of large detection range, high detection accuracy and fast response speed. [0003] The current grating ruler is mainly divided into incremental grating ruler and absolute grating ruler. The measuring principle of the incremental grating scale is to modulate the light into moiré fringes through two relatively moving gratings, and obtain the displacement variation after counting and subdividing the moiré fringes,...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01B11/26
CPCG01B11/02G01B11/26G01D5/34792G01D5/2495
Inventor 湛文亮吴维玲魏文锋
Owner GSK CNC EQUIP
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