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Fiber Bragg Gratings, IT Techniques and Strain Gauge Validation for Strain Calculation on Aged Metal Specimens
(MDPI, 2011-01)
This paper studies the feasibility of calculating strains in aged F114 steel specimens with Fiber Bragg Grating (FBG) sensors and infrared thermography (IT) techniques. Two specimens have been conditioned under extreme ...
Design and Development of a Low-Cost Optical Current Sensor
(MDPI, 2013-10)
In this paper we demonstrate the design of a low-cost optical current sensor. The sensor principle is the Faraday rotation of a light beam through a magneto-optical material, SF2, when a magnetic field is present. The ...
Influence of Humidity on Fiber Bragg Grating Sensors
(Hindawi, 2014-01)
We demonstrate the influence of the relative humidity (RH) on the wavelength of fiber Bragg grating sensors (FBGS), performing tests with five FBGS at different humidity and temperature conditions. These tests were performed ...
Photonic Low Cost Micro-Sensor for in-Line Wear Particle Detection in Flowing Lube Oils
(MDPI, 2017-03)
The presence of microscopic particles in suspension in industrial fluids is often an early warning of latent or imminent failures in the equipment or processes where they are being used. This manuscript describes work ...
A Temperature Sensor Based on a Polymer Optical Fiber Macro-Bend
(MDPI, 2013-10)
The design and development of a plastic optical fiber (POF) macrobend temperature sensor is presented. The sensor has a linear response versus temperature at a fixed bend radius, with a sensitivity of 1.92.10(-3) (degrees ...
Proof of Concept of Impact Detection in Composites Using Fiber Bragg Grating Arrays
(MDPI, 2013-09)
Impact detection in aeronautical structures allows predicting their future reliability and performance. An impact can produce microscopic fissures that could evolve into fractures or even the total collapse of the structure, ...
Harnessing Deep-Hole Drilling to Fabricate Air-Structured Polymer Optical Fibres
(MDPI, 2019-10-24)
The performance of a precisely controlled drilling technique is critical in the fabrication process of microstructured polymer optical fibres. For the creation of a holey preform, adequate drilling bits with large ...
Miniature interferometric humidity sensor based on an off-center polymer cap onto optical fiber facet
(Elsevier, 2019-06-17)
In this work, we propose an interferometric humidity sensor based on a polymer micro-cap bonded off-center on the polished end of a standard single mode fiber (SMF). In our sensor, the sensitive part is the micro-cap. In ...
Miniature interferometric humidity sensor based on an off-center polymer cap onto optical fiber facet
(Elsevier, 2019-09-15)
In this work, we propose an interferometric humidity sensor based on a polymer micro-cap bonded off-center on the polished end of a standard single mode fiber (SMF). In our sensor, the sensitive part is the micro-cap. In ...
Tip-Clearance Measurement in the First Stage of the Compressor of an Aircraft Engine
(MDPI, 2016-11-11)
In this article, we report the design of a reflective intensity-modulated optical fiber sensor for blade tip-clearance measurement, and the experimental results for the first stage of a compressor of an aircraft engine ...