METHOD AND DEVICE FOR DETECTING POSITIONAL CHANGE AMOUNT DUE TO MOVEMENT OF MOVING BODY

Title:

METHOD AND DEVICE FOR DETECTING POSITIONAL CHANGE AMOUNT DUE TO MOVEMENT OF MOVING BODY

Document Type and Number:

WIPO Patent Application WO/2019/151479

Kind Code:

A1

Abstract:

The present invention provides a method for detecting a positional change amount due to a movement of a moving body by reading, with a sensor, a plurality of gradations disposed along the direction of the movement. The method includes: a step for taking, as one period, one gradation among the plurality of gradations and acquiring a pseudo sinusoidal signal in response to the positional change amount; a step for executing a Fourier transform on the pseudo sinusoidal signal within the range of at least one gradation, and calculating, from the spectral intensity of each frequency component obtained by the Fourier transform, the signal intensity of a fundamental wave component and the signal intensity of at least one harmonic component; a step for calculating a gain corresponding to each of the at least one harmonic component by dividing each signal intensity of the at least one harmonic component by the signal intensity of the fundamental wave component; and a step for detecting the positional change amount by subtracting, from the pseudo sinusoidal signal, each harmonic component multiplied by a corresponding gain.

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Inventors:

KATSUMATA KAZUHISA (JP)
TAKAHASHI NAOYUKI (JP)

Application Number:

PCT/JP2019/003623

Publication Date:

August 08, 2019

Filing Date:

February 01, 2019

Export Citation:

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Assignee:

SANKYO SEISAKUSHO KK (JP)

International Classes:

G01D5/244

Foreign References:

JP2004108774A	2004-04-08
JP2016166741A	2016-09-15
EP2602594A1	2013-06-12
US20140225598A1	2014-08-14
JP2006112862A	2006-04-27
JP2008304249A	2008-12-18

Other References: