Title:
2つの遅延コイルからの光信号を処理してサニャックベース光ファイバセンサアレイのダイナミックレンジを増大させる装置および方法
Document Type and Number:
Japanese Patent JP4184265
Kind Code:
B2
Abstract:
A folded Sagnac fiber optic sensor array uses a common delay path to reduce distributed pickup in downlead fibers. The sensor array is used to detect perturbations (e.g., acoustic waves in water). By basing the folded Sagnac sensor array on operating principles similar to the Sagnac interferometer the sensor array has a stable bias point, has reduced phase noise, and allows a broadband signal source to be used rather than requiring a more expensive narrowline laser. A large number of sensors can be multiplexed into the architecture of the sensor array. In one particularly preferred embodiment, the sensor array is configured with couplers and amplifiers selected to direct substantially equal portions of an input light signal to each sensor in the array. In another particularly preferred embodiment, first and second delay paths (2240 & 2242) are provided for light at first and second wavelengths (2210 & 2212) to increase the dynamic range of the sensors.
Inventors:
Benjamin Jay, Bacock
Application Number:
JP2003519358A
Publication Date:
November 19, 2008
Filing Date:
August 07, 2002
Export Citation:
Assignee:
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
International Classes:
G01B9/02; G01H9/00; G01B11/00; G01D5/353; H04R23/00
Domestic Patent References:
| JP7505036A | ||||
| JP63132124A |
Foreign References:
| US6034924 |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai