56 documents found, page 1 of 6

Fiber Bragg grating based displacement sensors with low visual impact for struc...

The preservation of heritage structures and buildings is a major concern to guarantee access of the cultural and architectural values to current and future generations. It also contributes significantly to the society in terms of identity, economy, education, and tourism. Due to their ancient nature, combined with the human activity (in and/or around these structures) and the environmental conditions, these str...

Processing and structural health monitoring of a composite overwrapped pressure...

A process and Structural Health Monitoring system was implemented on a Composite Overwrapped Pressure Vessel (COPV) for hydrogen storage at 350 bar to be used in a fuel-cell system of an Unmanned Aerial Vehicle. This work reports the embedment strategy of optical fibre Bragg grating (FBG) sensors to monitor the full life cycle of the vessel, consisting of an aluminium liner and a wound carbon fibre reinforced p...

Public interest and the potential social impact of board games : the role of th...

Modern board games – precisely after what has been dubbed the “renaissance” of analog games since the publication of Catan and the consequent affirmation of the “German games” – have served for a vast reflection in the field of metagame. In this text it is considered that the effects following what is called “strategic twist” in modern board games, allow reflecting about the dynamics of the field of leisure/lud...

Comparação entre movimentos de halterofilismo e seus derivados na quantificação...

Real-Time Measurement of Refractive Index Using 3D-Printed Optofluidic Fiber Se...

This work describes a 3D-printed optofluidic fiber sensor to measure refractive index in real time, combining a microfluidic system with an optical fiber extrinsic Fabry-Perot interferometer. The microfluidic chip platform was developed for this purpose through 3D printing. The Fabry-Perot cavity was incorporated in the microfluidic chip perpendicularly to the sample flow, which was of approximately 3.7 µL/s. T...

FBG sensors for process and structural health monitoring of a small type III co...

In this work, fibre Bragg grating (FBG) sensors were embedded in a 1-litre type III composite overwrapped pressure vessel (COPV) for an unmanned aerial vehicle (UAV), during its manufacturing for process and structural health monitoring (SHM). A single optical fibre having eight FBG sensors was fixed around an aluminium liner to form a grid network. The carbon fibre/epoxy composite layers were wound on top of i...

Modelling, fabrication and characterization of long period gratings inscribed b...

In this paper, we present a method to fabricate long period gratings in standard telecommunications single mode fibers (SSMF), using a femtosecond laser system. A numerical model based on the coupled mode theory was developed and implemented with the aim to guide and improve the inscribing technique. This model takes in consideration the specifications of the inscription technique. Using this model, we have ana...

Overview on thermoactive materials, simulations and applications

Thermoelectric (TE) materials have been attracting increasing interest once they are capable of directly convert temperature variations into electricity, being used in thermoelectric generators and thermoelectric sensor devices, among others. This work reports on the main principles of thermoelectric and thermomagnetic effects as well as the main materials used for the development of applications. Additionally,...

Editorial

Trajectory control and modelling for wind turbine maintenance by using a RPAS

One of the most demanded assets nowadays is energy. Over many options to generate it, humankind must seek sustainable ways; therefore, renewable energies must be empowered. Moreover, wind provides great benefits, granting uncalculated power at our disposition. Since this task is executed by big structures, their maintenance represents a difficult task for human efforts to achieve, because the height requires mu...