High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

Kazuo Hotate; Kohji Makino; Mitsuteru Ishikawa; Yuzo Yoshikuni

doi:10.1117/12.514997

8 March 2004 High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

Kazuo Hotate, Kohji Makino, Mitsuteru Ishikawa, Yuzo Yoshikuni

Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004) https://doi.org/10.1117/12.514997
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States

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.

Citation Download Citation

Kazuo Hotate, Kohji Makino, Mitsuteru Ishikawa, and Yuzo Yoshikuni "High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function", Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); https://doi.org/10.1117/12.514997

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