Alarm system of optical fibre using the thermal-optical sensibility of the PNIPAAm polymer
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AuthorRueda Sánchez, Juan Carlos; Chana Chana, Denisse; Contreras Villalobos, Kevin; Coello Paria, Rafael; Lomer Barboza, Mauro Matías
© 2007 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Proceedings of SPIE, 2007, vol. 6619, 661946
Third European Workshop on Optical Fibre Sensors, Nápoles, 2007
SPIE Society of Photo-Optical Instrumentation Engineers
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Plastic optical fiber
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 32ºC), 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.
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