CAP

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This service develops its activity in the areas of optical sources, optical communications, fiber optic sensors and micro-manufacturing, having facilities for the design and development of electronic systems.

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Browsing CAP by Author "6406"
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    Cleaved Silica Microsphere for Temperature Measurement
    ( 2018) André Delgado Gomes ; Beatriz Machado Silveira ; Dellith,J ; Becker,M ; Rothhard,M ; Bartelt,H ; Orlando Frazão ; 4061 ; 6406 ; 6684
    A sensing structure based on a cleaved silica microsphere is proposed for temperature sensing. The microsphere was cleaved using focused ion beam milling. The asymmetry in the structure introduced by the cut generates not only new cavities but also random interferometric reflections inside the microsphere. These two spectral components can be separated using low-pass and high-pass filters, respectively. The sensor response to temperature can be extracted from the cavities' component using a correlation method. The device achieved a temperature sensitivity of -10.8 +/- 0.2 pm/degrees C between 30 degrees C and 80 degrees C. The same effect is impossible to be obtained in a normal uncleaved microsphere. The random interferometric component did not provide any information on temperature using the same analysis. However, when changing the temperature, a new and completely distinct reflection spectrum with no apparent correlation with others at different temperatures was achieved.
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    Colossal enhancement of strain sensitivity using the push-pull deformation method
    ( 2021) Paulo Robalinho ; André Delgado Gomes ; Orlando Frazão ; 4061 ; 6406 ; 7405
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    The fiber connection method using a tapered silica fiber tip for microstructured polymer optical fibers
    ( 2018) Frazão,O ; Ferreira,M ; André Delgado Gomes ; Kowal,D ; Statkiewicz Barabach,G ; Mergo,P ; 6406
    In this work, an alternative method of coupling light into microstructured polymer fibers is presented. The solution consists in using a fiber taper fabricated with a CO2 laser. The connection is formed by inserting a tapered silica tip into the holes of a microstructured polymer fiber. This alternative method is duly characterized and the feasibility of such fiber connection to enable the polymer fiber as a displacement sensor is also demonstrated. © 2018 by the authors.
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    High Enhancement Strain Sensor based on Vernier Effect using 2-Fiber Loop Mirrors
    ( 2020) Paulo Robalinho ; André Delgado Gomes ; Orlando Frazão ; 4061 ; 6406 ; 7405
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    Multipath Interferometer Polished Microsphere for Enhanced Temperature Sensing
    ( 2018) André Delgado Gomes ; Karami,F ; Zibaii,MI ; Latifi,H ; Orlando Frazão ; 6406 ; 4061