This work describes an in-fiber Michelson interferometer inclinometer which is sensitive to curvature applied in the tapered region. The performance of this inclinometer is evaluated by calculating the variation of the fringe visibility near the 1550 nm spectral range as a function of the tilt angle. It is presented the results of four experimental measurements and calculated the average and standard deviation of those measurements. The results indicate a good response of the sensor within the angular range between 3° and 6°. The average of those four measurements is around -0.15/° and the greatest standard deviation is about 5.5%.
This work presents numerical results related to an in-line Mach-Zehnder interferometer used as a refractive index sensor. The in-line Mach-Zehnder is based on abrupt tapers in standard single mode optical fiber. Numerical simulations were carried out using commercial software based on Beam Propagation Method in order to analyze the sensitivity response in terms of wavelength shift when this sensor is bent at certain radii of curvature. We realized that application of bending in the In-line Mach-Zehnder interferometer enhanced considerably the sensitivity of this sensor to the external refractive index. The best result was achieved for a radius of curvature of 10 mm (~500 nm/RIU for the refractive index range of 1.33 to 1.41) improving the sensitivity about eight times in comparison with the case with no bent.
The development of an interferometric optical fiber inclinometer is described in this paper. A weak tapered region is
induced in a standard single mode fiber in the vicinity of the cleaved fiber tip, using a standard fusion splicer. In this
situation an in-fiber Michelson interferometer is constructed that is sensitive to curvature applied in the tapered region. It
is shown that depending on the angular range, fringe visibility and/or peak position depend strongly on the applied
curvature enabling low cost dielectric inclinometer to be setup that is suitable for high voltage applications. It is
presented an analysis of the sensor response by means of experimental measurements and manipulation of these
experimental data through computational simulations. The results coming from the numerical simulations indicate a
good performance of the sensor within range of angular variation between 3 and 6 degrees and 10 and 14 degrees. A low
cost strategy to interrogate the response of sensor using electrically modulated fiber Bragg gratings, a photodetector and
frequency analysis is described. The results presented by this electric interrogation technique show a good sensitivity in
the range 3.5 to 5.5 degrees.
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