Title:
光コヒーレントセンサ及び光コヒーレントセンシング方法
Document Type and Number:
Japanese Patent JP7156132
Kind Code:
B2
Abstract:
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.
Inventors:
Naoki Yamashiro
Application Number:
JP2019060661A
Publication Date:
October 19, 2022
Filing Date:
March 27, 2019
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
G01J9/00; G01M11/02
Domestic Patent References:
| JP2018048917A | ||||
| JP2011164075A |
Attorney, Agent or Firm:
Hiroyuki Okada
Takashi Ogaki
Takashi Ogaki
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