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Proceedings Paper

Stabilization for intensity-based sensors using two-wavelength ratio technique
Author(s): George Z. Wang; Anbo Wang; Russell G. May; Adam E. Barnes; Kent A. Murphy; Richard O. Claus
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Paper Abstract

Intensity-based fiber optic sensors are referred to those sensors whose outputs are modulated by intensity levels and not optical phase variations. The attractive features of intensity-based sensors over interferometric sensors include simple in structure, absolute measurement and long-term stability in performance. One important issue for intensity-based fiber sensors is stabilization schemes used to compensate for unwanted disturbances in sensing systems. Two- wavelength ratio (TWR) method is one of the most commonly used compensation technique. In this paper, we study the TWR method in great details by discussing four novel intensity- based sensors developed in our research group. These fiber sensors are: (1) High temperature sensor based on the total internal reflection with temperature measurement up to 1000 degree(s)C; (2) Temperature sensor and distributed sensing system using dielectric filters, achieving temperature measurement of more than 100 degree(s)C and a resolution of 0.5 degree(s)C; (3) Displacement sensor using diffraction grating reflector with a dynamic range of 150 micrometers and 2 micrometers resolution; (4) Displacement sensor using GRIN lens having a displacement range up to 20 micrometers with sub-micrometers resolution. Issues related to the signal transmission in sensing systems are also addressed.

Paper Details

Date Published: 3 January 1996
PDF: 11 pages
Proc. SPIE 2594, Self-Calibrated Intelligent Optical Sensors and Systems, (3 January 1996); doi: 10.1117/12.229246
Show Author Affiliations
George Z. Wang, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
Russell G. May, Virginia Polytechnic Institute and State Univ. (United States)
Adam E. Barnes, Virginia Polytechnic Institute and State Univ. (United States)
Kent A. Murphy, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 2594:
Self-Calibrated Intelligent Optical Sensors and Systems
Anbo Wang, Editor(s)

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