21 October 2004 Using the intermodal beating frequency to interrogate a multipoint fiber Bragg grating laser sensor
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Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.590523
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela
Abstract
A multipoint fiber laser sensor, which consists of two cavities coupled based in three Bragg gratings of fiber optics and interrogated by the longitudinal mode beating frequency is presented. We used one Bragg grating (reference) and two Bragg gratings (sensors), which have the lowest reflection wavelength. The reference grating with the two sensors grating make two cavities: first one is the internal cavity which has 4230 m of length and the next one is the external cavity which has 4277 m of length. Measuring the laser beating frequency with a radio frequency (rf) analyzer for a resonance cavity and moving the frequency peaks when the another cavity are put in resonance, we prove that the arrangement can be used as a two points sensor for determining the difference of temperature or stress between these two points. On the other hand, one principal peak and three harmonics with bandwidths of 52 Hz were obtained with the rf analyzer. Their bandwidth was controlled by an intra-caivty fiber Optical Delay Line (ODL) and was measured with the rf analyzer.
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R. A. Vazquez-Sanchez, R. A. Vazquez-Sanchez, Evgueni Anatolevich Kuzin, Evgueni Anatolevich Kuzin, Jorge L. Camas-Anzueto, Jorge L. Camas-Anzueto, Sergio Mendoza-Vazquez, Sergio Mendoza-Vazquez, Baldemar Ibarra Escamilla, Baldemar Ibarra Escamilla, Manuel May-Alarcon, Manuel May-Alarcon, } "Using the intermodal beating frequency to interrogate a multipoint fiber Bragg grating laser sensor", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); doi: 10.1117/12.590523; https://doi.org/10.1117/12.590523
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