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:
Mar. 01, 2016
Filed:
Nov. 19, 2012
Hakusan Corporation, Tokyo, JP;
Kazumasa Tsukada, Tokyo, JP;
HAKUSAN CORPORATION, Tokyo, JP;
Abstract
An input of an optical interferometer is a periodical optical pulse. A phase of a first half and a latter half of a reference pulse is a 90 degree (independently orthogonal) phase difference. Two interferometric outputs iand i, where the phase difference is 90 degrees from each other, are obtained by interference of the reference pulse and the signal pulse. θ is calculated by referring the amplitude of reference pulse and the signal pulse to remove the light intensity fluctuations. Two values of cosand cosare calculated and positions are determined on the cosine curve by obtainingand θvalues. Δand Δ, which are the phase increment or decrement of bothandin a T period, are summed and becomes the sensor output signal that removes the measurement range limitation of ±90 degrees (a half wavelength of light) of the light phase.