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:
Oct. 24, 2023
Filed:
Oct. 17, 2022
Oki Electric Industry Co., Ltd., Tokyo, JP;
Kengo Koizumi, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
To uniquely determine a Brillouin frequency shift (BFS) even if a relation between phase and intensity of an intensity signal corresponding to a phase difference between the two optical paths in an interferometer varies. An optical fiber sensor includes a reference section average value calculation unitconfigured to acquire average intensity in a reference section, a phase control unitconfigured to control a delay unit in such a manner that a phase difference between two optical paths is swept from 0 to 2π, a Brillouin scattering coefficient elimination unitconfigured to eliminate a Brillouin scattering coefficient from an interference signal by using an intensity signal, a phase/amplitude calculation unitconfigured to acquire an initial phase φand amplitude of the interference signal by using a relation between average intensity Iand the phase obtained through the phase sweep from 0 to 2π, a normalization unitconfigured to use the amplitude of the interference signal to normalize the interference signal from which the Brillouin scattering coefficient is eliminated, and a BFS computation unitconfigured to compute a BFS by using the normalized interference signal.