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Proceedings Paper

Alarm system of optical fibre using the thermal-optical sensibility of the PNIPAAm polymer
Author(s): J. C. Rueda; D. Chana; K. Contreras; R. Coello; M. Lomer
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Paper Abstract

An alarm system as extrinsic sensor on optical fibers for detecting and controlling inflammable liquids based on thermosensitive proprieties of the PNIPAAm hydrogel is presented. The changes on the optical proprieties of the PNIPAAm with the temperature (being its LCST 32°C), induce abrupt changes on the light intensity and they act as an alarm signal, which is transmitted by optical fibers and after they will be processed by an optoelectronic circuit, responsible to active an alarm. An appropriate system consists of the hydrogel connected between its ends to two segments of plastic optical fibers (source and receiver) and they turn on the alarm when a photo detector does not receive light when the hydrogel becomes when it reaches threshold of temperature. The characterization of the hydrogel and the experimental results are presented for a prototype.

Paper Details

Date Published: 2 July 2007
PDF: 4 pages
Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 661946 (2 July 2007); doi: 10.1117/12.738672
Show Author Affiliations
J. C. Rueda, Pontificia Univ. Católica del Perú (Peru)
D. Chana, Pontificia Univ. Católica del Perú (Peru)
K. Contreras, Pontificia Univ. Católica del Perú (Peru)
R. Coello, Pontificia Univ. Católica del Perú (Peru)
M. Lomer, Univ. of Cantabria (Spain)


Published in SPIE Proceedings Vol. 6619:
Third European Workshop on Optical Fibre Sensors

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