Absolute grating ruler multi-track encoding method

A technology of absolute grating ruler and encoding method, which is applied in the direction of converting sensor output, measuring device, instrument, etc., to achieve the effect of improving measurement accuracy, easy generation, and large encoding capacity

Active Publication Date: 2014-02-05
GUANGDONG UNIV OF TECH
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  • Absolute grating ruler multi-track encoding method

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Embodiment Construction

[0033] Generation of m-order pseudo-random sequence:

[0034] Such as figure 1 , assuming the initial state is ( a n-４ a n-３ a n-2 a n-1 )= (1000), the feedback logic is:

[0035] a n-1 =a n-３ ⊕ a n-４ .

[0036] Then a set of pseudorandom sequences can be obtained:

[0037] The m-sequence pseudo-random code feedback series is n, and the code length is

[0038] L m =2 n -1

[0039] The recurring relational expression of the m-sequence linear feedback shift register:

[0040]

[0041] Ruojing k Shifting times, the output of the lth stage is:

[0042]

[0043] The characteristic polynomial of an m-sequence linear feedback shift register:

[0044]

[0045] The original polynomial of the m-sequence linear feedback shift register:

[0046]The necessary and sufficient condition for an n-stage linear feedback shift register to generate m sequences is that its characteristic polynomial is a primitive polynomial of degree n. If an n-degree polynomial...

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Abstract

The invention discloses an absolute grating ruler multi-track encoding method. In order to solve problems, such as the accumulative error of incremental encoding and the hardware complexity of absolute encoding, etc., in the micro-nano machining measurement process, the invention adopts an absolute encoding method based on p-element M-sequence pseudo-random codes suitable for single track and multiple tracks. The encoding method is suitable for a straight line absolute position encoder, and a disk absolute angle encoder, locating can be performed at any time, and the boot back-to-zero operation does not needed. Moreover, an incremental encoding strip is provided, so measurement accuracy can be improved by suing the phase segmentation method. The encoding method is an absolute position encoding method has advantages of easy generation, replication and processing, large encoding capacity, low decoding cost and macro-micro composite performance. The encoding method comprises ordinary single-track binary M-sequence absolute grating ruler straight-line encoding, a M-sequence disk encoder, code expanding method multi-code-channel pseudo-random code straight-line encoding and code expanding method p-element M-sequence pseudo-random codes, and the maximum encoding method is obtained by combing the above the encoding methods.

Description

technical field [0001] The invention relates to a multi-track coding method of an absolute grating ruler. The coding method is suitable for a linear absolute position encoder and a disc absolute angle encoder, and belongs to a coding method of high-precision absolute grating ruler position coding and angle coding. Background technique [0002] Grating ruler, also known as grating ruler displacement sensor or grating ruler sensor, is a measurement feedback device that uses the optical principle of grating. Grating ruler can be used to detect linear displacement or angular displacement, and is often used in closed-loop servo systems of CNC machine tools. [0003] At present, grating rulers are mainly divided into three categories: incremental grating rulers, absolute grating rulers and incremental grating rulers with distance code reference marks. The position detection signal of the grating ruler is divided into two types: incremental counting output and absolute value outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
Inventor 陈新王晗陈新度刘强吴志雄
Owner GUANGDONG UNIV OF TECH
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