Power modulation based fiber-optic loop-sensor having a dual measurement range

被引：0
|
作者：
Nguyen, Nguyen Q. [1 ]
Gupta, Nikhil [1 ]
机构：
[1] Department of Mechanical and Aerospace Engineering, Polytechnic Institute, New York University, Brooklyn, NY 11201, United States
来源：
Journal of Applied Physics | 2009年 / 106卷 / 03期
关键词：
A fiber-optic sensor is investigated in this work for potential applications in structural health monitoring. The sensor; called fiber-loop-sensor; is based on bending an optical fiber beyond a critical radius to obtain intensity losses and calibrating the losses with respect to the applied force or displacement. Additionally; in the present case; the use of single-mode optical fibers allows the appearance of several resonance peaks in the transmitted power-displacement graph. The intensity of one of these resonances can be tracked in a narrow range to obtain high sensitivity. Experimental results show that the resolution of 10-4 N for force and 10-5 m for displacement can be obtained in these sensors. The sensors are calibrated for various loop radii and for various loading rates. They are also tested under loading-unloading conditions for over 104 cycles to observe their fatigue behavior. The sensors show very repeatable response and no degradation in performance under these test conditions. Simple construction and instrumentation; high sensitivity; and low cost are the advantages of these sensors. © 2009 American Institute of Physics;
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