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Sensors 2012, 12(1), 415-428; doi:10.3390/s120100415

An Intrinsic Fiber-Optic Single Loop Micro-Displacement Sensor

* ,
Centro de Investigaciones en Optica, Loma del Bosque 115, Col. Lomas del Campestre, Leon, Guanajuato, 37150, Mexico
* Author to whom correspondence should be addressed.
Received: 15 December 2011 / Revised: 26 December 2011 / Accepted: 28 December 2011 / Published: 4 January 2012
(This article belongs to the Special Issue Optical Fiber Sensors 2012)
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A micro-displacement sensor consisting of a fiber-loop made with a tapered fiber is reported. The sensor operation is based on the interaction between the fundamental cladding mode propagating through the taper waist and higher order cladding modes excited when the taper is deformed to form a loop. As a result, a transmission spectrum with several notches is observed, where the notch wavelength resonances shift as a function of the loop diameter. The loop diameter is varied by the spatial displacement of one end of the fiber-loop attached to a linear translation stage. In a displacement range of 3.125 mm the maximum wavelength shift is 360.93 nm, with 0.116 nm/μm sensitivity. By using a 1,280 nm broadband low-power LED source and a single Ge-photodetector in a power transmission sensor setup, a sensitivity in the order of 2.7 nW/μm is obtained in ~1 mm range. The proposed sensor is easy to implement and has a plenty of room to improve its performance.
Keywords: fiber sensors; displacement sensor; tapered fiber; fiber loop fiber sensors; displacement sensor; tapered fiber; fiber loop
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Martinez-Rios, A.; Monzon-Hernandez, D.; Torres-Gomez, I.; Salceda-Delgado, G. An Intrinsic Fiber-Optic Single Loop Micro-Displacement Sensor. Sensors 2012, 12, 415-428.

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