OPTICAL COHERENT SENSOR AND OPTICAL COHERENT SENSING METHOD

WIPO Patent Application WO/2020/194856

A1

Without incorporating an expensive device, this invention uses signal processing to prevent fading from causing accuracy degradation. This invention comprises: a light source unit that produces optical pulses as probe light, a light reception unit that produces a beat signal through coherent detection of signal light produced by an object of measurement as a result of the probe light, and a computation unit that receives the beat signal. The computation unit comprises a light information acquisition means, accuracy degradation prevention means, and phase difference information acquisition means. For each optical pulse, the light information acquisition means acquires, from the beat signal, the distribution of the intensity I(tj) and phase P(tj) of the signal light in relation to the light reception time tj of the signal light. The accuracy degradation prevention means sets a reference time ST. The phase difference information acquisition means acquires a phase difference for the light reception time tj of the signal light as the phase difference P(tk) - P(ti) between the light reception time tk, where tk > tj > ti and the difference between tk and ti is the reference time ST, and the light reception time ti and acquires the distribution of the phase difference in relation to the light reception time of the signal light.

YAMASHIRO NAOKI (JP)

PCT/JP2019/045776

October 01, 2020

November 22, 2019

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OKI ELECTRIC IND CO LTD (JP)

G01J9/00; G01M11/00

JP2018048917A	2018-03-29
JP2011164075A	2011-08-25
JP2011038839A	2011-02-24
JP2007086008A	2007-04-05
JP2010175502A	2010-08-12
JP2017044504A	2017-03-02
JP2002267537A	2002-09-18

TAIYO, NAKAJIMA & KATO (JP)

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