Patent ID: 9312656
Filing Date: 2016-04-12
CPC Classification: G01B,G01D,G01K,G01L,H01S

Claim Text:
1. An optical fiber sensor system using a pulse laser, comprising: a pulse laser generator that generates and outputs pulse laser light; a main optical coupler that receives the pulse laser light generated and outputted from the pulse laser generator from a first input terminal, branches the received light to a first output terminal and a second output terminal to output the branched light, and outputs, through a third output terminal, light input reversely from each of the first output terminal and the second output terminal; a reference optical fiber that is connected to the first output terminal and reflects light input through the main optical coupler to provide a reference optical signal, and extends by a predetermined length as an optical fiber; a multi-point sensing optical fiber unit that is connected to the second output terminal, and in which optical fibers are connected in series or in parallel corresponding to a plurality of sensing points so as to measure a physical quantity to be measured for each of the plurality of sensing points; an optical detection unit that converts an optical signal input through the third output terminal into an electrical signal; and a diagnosis processing unit that detects a change of the physical quantity which is set for the sensing points from a signal output from the optical detection unit, wherein the multi-point sensing optical fiber unit is formed in such a manner that the optical fibers are mutually bonded in series and a bonded portion is the sensing point or the optical fibers having mutually different lengths are mutually coupled in parallel so that light made incident through the second output terminal is branched to be reflected at a termination of the optical fiber, or light is selectively made incident to the optical fibers having mutually different lengths by a multiplexer.