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Grating speed measurement method and device

A speed measurement and grating technology, applied in the field of grating Moiré fringe subdivision technology, can solve problems such as the inability to realize speed measurement, and achieve good linearity, increase the number of subdivisions, and achieve good pixel uniformity.

Inactive Publication Date: 2016-07-06
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0003] Purpose of the invention: The present invention provides a grating velocity measurement method and device, the purpose of which is to solve the problem that the previous devices cannot realize the velocity measurement

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  • Grating speed measurement method and device
  • Grating speed measurement method and device

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specific Embodiment approach

[0035] Specific embodiments: the patent of the present invention will be further described below in conjunction with the accompanying drawings:

[0036] A grating speed measurement method, using CMOS to collect the Moiré fringe light intensity signal of the grating sensor, and modulate it to the frequency of the wavelet base, and then perform wavelet transformation on the modulated signal to determine the frequency value corresponding to the largest ridge, according to the frequency value Then calculate the velocity value, the steps of this method are as follows:

[0037] ① Extract two grating signals with a difference of 90° in CMOS

[0038] A complex number is composed of two orthogonal grating signals: U(x)=U c (x)+jU s (x),

[0039] ②Wavelet FM signal:

[0040] The wavelet basis function can be optional. When the complex Shannon wavelet basis function is selected, the output signal of the grating sensor is modulated by the complex Shannon wavelet basis function is to m...

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Abstract

In the position control system, multiple feedbacks such as displacement and speed are used to improve control accuracy. The grating has the advantages of precision, large range, and low cost as displacement feedback. This paper proposes the use of wavelet transform to realize the dual-parameter simultaneous extraction of the displacement and velocity of grating Moiré fringes. The scale factor corresponds to the velocity, the translation factor corresponds to the displacement, and the modulation changes The traditional grating Moiré fringe only measures single parameter of displacement and multi-parameter sensor realizes multi-parameter feedback, which is of great significance for improving positioning accuracy and simplifying the structure of the positioning system.

Description

Technical field: [0001] The patent of the present invention mainly involves the measurement of multiple parameters such as grating displacement, velocity, and acceleration, and the subdivision technology of grating moiré fringes. Background technique: [0002] Metering grating is a sensor that uses grating Moiré fringe phenomenon to measure length and angle. Because of its high measurement resolution, reliable use, small size, and easy maintenance, it is widely used in industrial control detection systems. For example, the grating sensor is used in the position and speed measurement system of the robot, which converts physical quantities such as position and speed into corresponding digital quantities, and realizes the measurement and control of the position and speed of the robot. Therefore, the grating sensor is an important part of the robot system, and its measurement accuracy and resolution directly affect the accuracy and performance of the robot system. At present, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/36G01B11/02
Inventor 常丽
Owner SHENYANG POLYTECHNIC UNIV
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