Zobrazeno 1 - 10
of 557
pro vyhledávání: '"Orlando, Frazão"'
Autor:
Paulo Robalinho, Vinícius Piaia, Liliana Soares, Susana Novais, António Lobo Ribeiro, Susana Silva, Orlando Frazão
Publikováno v:
Sensors, Vol 24, Iss 21, p 6898 (2024)
This paper presents a new type of phase-shifted Fiber Bragg Grating (FBG): the sliced-FBG (SFBG). The fabrication process involves cutting a standard FBG inside its grating region. As a result, the last grating pitch is shorter than the others. The o
Externí odkaz:
https://doaj.org/article/453f81e9049d486896d07a7862c064c5
Autor:
Liliana Soares, Rosa Ana Perez-Herrera, Susana Novais, António Ferreira, Susana Silva, Orlando Frazão
Publikováno v:
Photonics, Vol 11, Iss 5, p 393 (2024)
In this study, different configurations based on linear fiber lasers were proposed and experimentally demonstrated to measure the concentration of liquid solutions. Samples of paracetamol liquid solutions with different concentrations, in the range f
Externí odkaz:
https://doaj.org/article/f687b53e47704bcf9ef5feb26d12055a
Publikováno v:
Sensors, Vol 24, Iss 3, p 891 (2024)
This paper presents an approach to enhancing sensitivity in optical sensors by integrating self-image theory and graphene oxide coating. The sensor is specifically engineered to quantitatively assess glucose concentrations in aqueous solutions that s
Externí odkaz:
https://doaj.org/article/bb82b93dffbb4877be5a4e37d12416b0
Autor:
António Vaz Rodrigues, Catarina Monteiro, Susana O. Silva, Cassiano Linhares, Helder Mendes, Sérgio M. O. Tavares, Orlando Frazão
Publikováno v:
U.Porto Journal of Engineering, Vol 8, Iss 3, Pp 18-23 (2022)
In this work, a brief review on the application of fiber optic sensors on power grid apparatus is presented. Power transformers, which are the nodes between electrical transmission lines, are the most expensive, critical and one of the central units
Externí odkaz:
https://doaj.org/article/46829d81d070492eb28c9e8e1b8db2c6
Autor:
Liliana Soares, Rosa Ana Pérez-Herrera, Susana Novais, António Ferreira, Susana Silva, Orlando Frazão
Publikováno v:
Photonics, Vol 10, Iss 1, p 50 (2023)
Process Analytical Technology (PAT) has been increasingly used in the pharmaceutical industry to monitor essential parameters in real-time during pharmaceutical processes. The concentration of Active Pharmaceutical Ingredients (APIs), such as paracet
Externí odkaz:
https://doaj.org/article/e26a434eb42544d4a29324345edd5f74
Publikováno v:
Sensors, Vol 23, Iss 2, p 618 (2023)
In this paper, a different Fiber Loop Mirror (FLM) configuration with two circulators is presented. This configuration is demonstrated and characterized for sensing applications. This new design concept was used for strain and torsion discrimination.
Externí odkaz:
https://doaj.org/article/23553a277e4040ccadd92a4bbd33ec6e
Publikováno v:
Sensors, Vol 22, Iss 23, p 9315 (2022)
In this study, an interrogation system based on an erbium-doped fiber ring cavity for refractive index measurements is presented and experimentally demonstrated. This cavity ring includes a 1 × 3 coupler wherein one of the fiber output ports is used
Externí odkaz:
https://doaj.org/article/414e996b164f4f27ade29a044188edb7
Publikováno v:
Photonics, Vol 9, Iss 11, p 825 (2022)
In this paper, we study the implementation of a secure key distribution system based on an ultra-long fiber laser with a bi-directional erbium-doped fiber amplifier. The resilience of the system was tested against passive attacks from an eavesdropper
Externí odkaz:
https://doaj.org/article/f2b327bd94a645859fb874db46832bb5
Autor:
Victor H. R. Cardoso, Paulo Caldas, Maria Thereza R. Giraldi, Orlando Frazão, João C. W. Albuquerque Costa, José Luís Santos
Publikováno v:
Sensors, Vol 22, Iss 19, p 7652 (2022)
An optical strain gauge based on a balloon-like interferometer structure formed by a bent standard single-mode fiber combined with a 3D printer piece has been presented and demonstrated, which can be used to measure displacement. The interferometer h
Externí odkaz:
https://doaj.org/article/8664d8236d0640c394bb29113f81a266
Publikováno v:
Photonic Sensors, Vol 10, Iss 1, Pp 1-6 (2019)
Abstract The proposed technique demonstrates a fiber ring resonator interrogated by an optical time domain reflectometer (OTDR), for intensity sensing. By using this methodology, a cavity round trip time of 2.85 μs was obtained. For a proof of conce
Externí odkaz:
https://doaj.org/article/58120a1bd3d746e1a2667a23b52dc6ac