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Proceedings Paper

High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function
Author(s): Kazuo Hotate; Kohji Makino; Mitsuteru Ishikawa; Yuzo Yoshikuni
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Paper Abstract

Arbitrary characteristics of optical interference have been realized, in our group, by Synthesis of Optical Coherence Function(SOCF) with electrical control and without mechanical scanning. Various applications for optical sensing have been developed by SOCF. Delta function like optical coherence function with higher spatial resolution and higher dynamic range have been achieved by using a broadband tunable super-structure-grating distributed Bragg reflector laser diode (SSG-DBRLD). This time, we improve driving circuit and frequency calibration of the SSG-DBR-LD to achieve a 5THz tunable band width. We apply the characteristics to distributed fiber optic force sensing using polarization maintaining fiber (PMF) as a sensing head. Its principle is polarization mode coupling by the force applied to the fiber. In the experiment, we improve the spatial resolution more than one digit compared with the previous data, and realize 20cm. This technique can be used as a nerve system for smart materials and structures.

Paper Details

Date Published: 8 March 2004
PDF: 7 pages
Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); doi: 10.1117/12.514997
Show Author Affiliations
Kazuo Hotate, Univ. of Tokyo (Japan)
Kohji Makino, Univ. of Tokyo (Japan)
Mitsuteru Ishikawa, NTT Photonics Labs. (Japan)
Yuzo Yoshikuni, NTT Photonics Labs. (Japan)

Published in SPIE Proceedings Vol. 5272:
Industrial and Highway Sensors Technology
Brian Culshaw; Samuel David Crossley; Helmut E. Knee; Michael A. Marcus; John P. Dakin, Editor(s)

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