Fiber optic displacement sensor using fiber coupler probe and real objects
Abstract
Purpose
The purpose of this paper is to demonstrate a simple design of a fiber optic displacement sensor using a multimode plastic fiber coupler based on reflective intensity modulation technique.
Design/methodology/approach
The performances of this sensor are investigated by correlating the detector output with different light sources, coupling ratios and various real objects with different reflectivity properties namely aluminum, brass and copper. In contrast to the output profile produced by probes with multiple fibers placed adjacently together, this sensor uses only one fiber for sending and receiving the light and therefore only the back slope exists.
Findings
Aluminum exhibit the highest performance among the real objects when coupled with a red He‐Ne laser and a coupling ratio of 50:50 with a sensitivity, linear range, resolution and dynamic range of 1.7 mV/mm, 1.5 mm, 16 μm, and 5.0 mm, respectively.
Originality/value
This is the first demonstration of a fiber optic displacement sensor using fiber coupler probe with successful examination of the correlation between the detector output, variation in coupling ratios and reflectivity properties of the tested real objects.
Keywords
Citation
Yasin, M., Rahman, H.A., Bidin, N., Harun, S.W. and Ahmad, H. (2012), "Fiber optic displacement sensor using fiber coupler probe and real objects", Sensor Review, Vol. 32 No. 3, pp. 212-216. https://doi.org/10.1108/02602281211233197
Publisher
:Emerald Group Publishing Limited
Copyright © 2012, Emerald Group Publishing Limited