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In this work we report the development of a method to characterize occlusal splints using fiber Bragg grating sensors. The occlusal splints are used to treatment for muscle pain resulting from parafunctional habit and or occlusal alterations. The gratings are inserted in to the occlusal splints in order to measure the forces applied to the splints. The analyses are performed in a volunteer with bruxism,...
We report an optical fiber multiparameter sensor for refractive index and temperature measurements. The proposed sensor is composed by a microcavity in multimode fiber, assisted by Bragg gratings (FBGs) in singlemode fiber. The microcavity is engraved in a multimode optical fiber by using the femtosecond laser micromachining. The sensor is characterized through microcavity immersion in water and based...
This study focused on the development of a biosensor able to follow the deformations of the bone tissue and to allow for future studies in the areas of health sciences. The biosensor is designed with a titanium mesh, which is fixed in the jaws of the animal to be monitored. The animal received different kinds of foods to allow analysis of the signal acquired during feeding. The acquired signal was...
We report the fabrication of rectangular shaped microchannels inscribed in ordinary microscope slides by using Femtosecond Laser Irradiation followed by Chemical Etching (FLICE) technique that allow to construct true 3-D structures. The femtosecond laser pulses in conjunction with a nano positioner are initialy used to make a matrix of interconnected waveguides. This matrix is dipped in a 10% fluoridric...
This work reports a method to be used for the improvement of accuracy in fiber Bragg grating interrogation systems that operate with the tunable filter method or with a tunable laser signal. Since there may be an intrinsic nonlinearity in digital-to-analog converters (DAC) which produce the sweeping signal applied to the filter or laser, a calibration method, either by optical or electronic means...
A new way to produce a controlled notch filters based on regenerated Bragg grating is demonstrated. This can be used in several photonics applications, such as RF-filtering or subcarrier processing, where specific notch filters are required.
This work reports the simultaneous use of electrical impedance spectroscopy and fiber Bragg grating (FBG) refractive index sensing in the estimation of the main components of specific fuel mixtures. Fuel samples containing gasoline, dehydrated ethanol, diesel, and kerosene were analyzed. Electrical impedance spectra and FBG sensor signals were registered for each mixture. Artificial Neural Networks...
Fiber Bragg grating (FBG) spectrometric interrogation is widely used in strain, temperature, and refractive index sensing, where the acquired FBG sensor reflected signal has the spectrum peak monitored to infer a physical quantity. This monitoring, or peak detection, is subject to noise and different types of distortion, and many applications require the preprocessing of the signals to achieve the...
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