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Signal Reconstruction Method of Grating Moiré Fringe

A moiré fringe and signal technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of linearity to be improved, signal amplitude change sensitivity, etc., to achieve insensitivity to amplitude changes, realize displacement measurement, good The effect of linearity

Active Publication Date: 2019-06-18
常州秦宁迈超电子科技有限公司
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  • Application Information

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Problems solved by technology

Although these algorithms can obtain linear reconstruction functions, they are usually sensitive to signal amplitude changes and the linearity needs to be improved.

Method used

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  • Signal Reconstruction Method of Grating Moiré Fringe
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  • Signal Reconstruction Method of Grating Moiré Fringe

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] see figure 1 , a grating moiré fringe signal reconstruction method, comprising the following steps:

[0027] a. Signal preprocessing: Input the signal output by the grating ruler into the signal preprocessing circuit board for filtering, and use the data acquisition card PCI-8757 to collect the two preprocessed voltage signals.

[0028] b. Linear reconstruction of the signal: such as Figure 1 , through the data acquisition card PCI-8757 and Labview software, input the collected voltage value into the server...

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Abstract

The invention discloses a grating moire pattern signalization reconstruction method. The method comprises following steps of a, signal preprocessing: carrying out photoelectric conversion on grating moire patterns, and carrying out filtering and calculation processing so as to obtain two sine voltage signals V<s>(theta) and V<c>(theta) with signal difference of about 90 degrees; b, signal linearity reconstruction: carrying out linearity reconstruction on the obtained signals V<s>(theta) and V<c>(theta) in the step a, and introducing an auxiliary function Bit(theta) so as to obtain a linearization function V<OLR>(theta) through reconstruction; and c, displacement measurement: using a period counter to record the number N of the whole period of the moire pattern change, wherein for an incremental grating linear displacement sensor with the grating distance of d, the displacement value x obtained through the measurement is shown in the description. In this way, the signal reconstruction function is not sensitive to amplitude change of the original signal; the method has good linearity; and finally, displacement measurement is achieved.

Description

technical field [0001] The invention relates to the field of photoelectric measurement, in particular to a signal reconstruction method of grating Moiré fringes. Background technique [0002] In recent years, the grating displacement sensor has been widely used in displacement monitoring, and has become the most typical representative of the measurement technology based on Moiré fringe theory. The grating displacement sensor must contain a pair of gratings, one of which is used as a measurement reference, which is called the scale grating (or the main grating), and the other is called the indicator grating. When two gratings are stacked face to face, moiré fringes will be generated. When the two gratings move relative to each other along the direction perpendicular to the grating lines, the moiré fringes will move correspondingly in the same direction as the grating lines. Using photoelectric elements to convert the changing light intensity into changing electrical signals,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 刘红忠史永胜尹磊范禅金
Owner 常州秦宁迈超电子科技有限公司
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