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Proceedings Paper

Fiber optic sensors and systems at the Federal University of Rio de Janeiro
Author(s): Marcelo Martins Werneck; Paulo Acioly M. dos Santos; Aldo Pacheco Ferreira; Luis E. Maggi; Carlos Roberto de Carvalho Jr.; R. M. Ribeiro
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Paper Abstract

As widely known, fiberoptics (FO) are being used in a large variety of sensors and systems particularly for their small dimensions and low cost, large bandwidth and favorable dielectric properties. These properties have allowed us to develop sensors and systems for general applications and, particularly, for biomedical engineering. The intravascular pressure sensor was designed for small dimensions and high bandwidth. The system is based on light-intensity modulation technique and uses a 2 mm-diameter elastomer membrane as the sensor element and a pigtailed laser as a light source. The optical power output 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 (bacteria) 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% in both ranges of 0 to 25 kV and 0 to 1000 A. The optical flowmeter uses a cross-correlation technique that analyses 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 these paper use general-purpose components including optical fibers and optoelectronic devices, which are readily available, and of low cost.

Paper Details

Date Published: 19 August 1998
PDF: 4 pages
Proc. SPIE 3573, OPTIKA '98: 5th Congress on Modern Optics, (19 August 1998); doi: 10.1117/12.321010
Show Author Affiliations
Marcelo Martins Werneck, Federal Univ. of Rio de Janeiro (Brazil)
Paulo Acioly M. dos Santos, Federal Univ. of Rio de Janeiro (Brazil)
Aldo Pacheco Ferreira, Federal Univ. of Rio de Janeiro (Brazil)
Luis E. Maggi, Federal Univ. of Rio de Janeiro (Brazil)
Carlos Roberto de Carvalho Jr., Federal Univ. of Rio de Janeiro (Brazil)
R. M. Ribeiro, Federal Univ. of Rio de Janeiro (Brazil)

Published in SPIE Proceedings Vol. 3573:
OPTIKA '98: 5th Congress on Modern Optics
Gyorgy Akos; Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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