The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1989
Filed:
Sep. 24, 1987
Roger G Dower, Vancouver, British Columbia, CA;
Dale C Penner, Vancouver, British Columbia, CA;
Robert S Hannebauer, Vancouver, British Columbia, CA;
Other;
Abstract
An electro-optical displacement sensor comprises an optical source including a plurality of optical grating lines for producing from an incident optical signal a transmitted optical signal having a spatially periodic intensity pattern. Optical sensing means receives the transmitted signal as an input across a plurality of optical receptors, each of which receptors provides an output signal corresponding to the amplitude of the transmitted signal as sensed by the receptor. The receptors are spaced one from the other by a distance different from the fundamental spatial wavelength of the transmitted signal. Signal conditioning means derive a signal vector from the receptor output signals, the signal vector than being processed to derive first and second independent component signals. The component signals are then combined to produce an interpolated phase signal corresponding to the interpolated position of the grating lines relative to the optical receptors.