Abstract
An ultra-high sensitive strain sensor is proposed. The sensing head, based on the post-processing of a fiber Bragg grating, is used to perform passive and active strain measurements. Both wavelength and full width half maximum dependences with the applied strain are studied for the passive sensor, where maximum sensitivities of 104.1 pm/µε and 61.6 pm/µε are respectively obtained. When combining the high performance of this sensor with a ring laser cavity configuration, the Bragg grating will act as a filter and high resolution measurements can be performed. With the proposed sensor, a resolution of 700 nε is achieved.
Highlights
Optical fiber tapers, usually applied in sensors or fiber lasers, can be divided in two groups according to their manufacture: mechanical or chemical tapers
The sensing head used was produced by splicing the fiber Bragg gratings (FBGs) to the end section of single mode fiber (SMF)
The fiber tip with the FBG was subjected to wet chemical etching, being submerged in a
Summary
Usually applied in sensors or fiber lasers, can be divided in two groups according to their manufacture: mechanical or chemical tapers. Mechanical tapers, produced by stretching the fiber, present reduced core and cladding diameters. The use of fiber Bragg gratings (FBGs) in tapered fibers was used to measure strain and temperature [6]. Besides the biconical tapers [10,11], fiber tip sensors have been proposed These sensors present high-sensitivity to the environment [12] and are very well suited to perform biosensing [13]. Fiber Bragg gratings have attracted significant attention from academia, and from industry [14] These structures have been widely explored as sensors as well as optical filters that are suitable, for instance, for application in fiber lasers. Two different configurations are compared, for passive and active measurements
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