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Proceedings Paper

Research progress in fiber optic sensors and systems at the Federal University of Rio de Janeiro
Author(s): Marcelo Martins Werneck; Aldo Pacheco Ferreira; Luis E. Maggi; C. C. De Carvalho; R. M. Ribeiro
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Paper Abstract

As widely known, fiberoptics (FO) are being used in a large variety of sensor an systems particularly for their small dimensions and low cost, large bandwidth and favorable dielectric properties. These properties have allowed us to develop sensor and systems for general applications and, particularly, for biomedical engineering. The intravasculator pressure sensor was designed for small dimensions and high bandwidth. The system is based on light- intensity modulation technique and use a 2 mm-diameter elastomer membrane as the sensor element and a pigtailed laser as a light source. The optical power out put curve was linear for pressures within the range of 0 to 300 mmHg. The real time optical biosensor uses the evanescent field technique for monitoring Escherichia coli growth in culture media. The optical biosensor monitors interactions between the analytic and the evanescent field of an optical fiber passing through it. The FO based high voltage and current sensor is a measuring system designed for monitoring voltage and current in high voltage transmission lines. The linearity of the system is better than 2 percent in both ranges of 0 to 25 kV and 0 to 1000 A. The optical flowmeter uses a cross-correlation technique that analyzes two light beams crossing the flow separated by a fixed distance. The x-ray image sensor uses a scintillating FO array, one FO for each image pixel to form an image of the x-ray field. The systems described in this paper use general-purpose components including optical fibers and optoelectronic devices, which are readily available, and of low cost.

Paper Details

Date Published: 3 February 1999
PDF: 7 pages
Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); doi: 10.1117/12.339094
Show Author Affiliations
Marcelo Martins Werneck, Univ. Federal do Rio de Janeiro (Brazil)
Aldo Pacheco Ferreira, Univ. Federal do Rio de Janeiro (Brazil)
Luis E. Maggi, Univ. Federal do Rio de Janeiro (Brazil)
C. C. De Carvalho, Univ. Federal do Rio de Janeiro (Brazil)
R. M. Ribeiro, Univ. Federal do Rio de Janeiro (Brazil)

Published in SPIE Proceedings Vol. 3541:
Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII
Alan D. Kersey; John P. Dakin; John P. Dakin; Alan D. Kersey; Dilip K. Paul, Editor(s)

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