Multiplexing of Long-Length Fiber Bragg Grating Distributed Sensors Based on Synthesis of Optical Coherence Function

Long-length fiber Bragg grating (FBG) distributed sensors are multiplexed, and measurement of Bragg wavelength distribution along the gratings are demonstrated. This sensing system adopts synthesis of optical coherence function (SOCF) as a reflectometry technique to measure the distribution of the l...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 23; no. 21; pp. 1555 - 1557
Main Authors Kajiwara, K., Hotate, K.
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2011
Subjects
Fiber Bragg grating (FBG)
Fiber gratings
Multiplexing
optical coherence function
Optical fiber sensors
Optical reflection
optical sensing and sensors
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Summary:Long-length fiber Bragg grating (FBG) distributed sensors are multiplexed, and measurement of Bragg wavelength distribution along the gratings are demonstrated. This sensing system adopts synthesis of optical coherence function (SOCF) as a reflectometry technique to measure the distribution of the local reflection spectra inside the long-length FBGs. Simulations have been carried out to determine appropriate FBG reflectivity for the multiplexing. In the proposed system, which is a heterodyne interferometer, heterodyne beat frequency for each FBG gets different from those for the others, when the measurement speed becomes higher. By introducing a way for compensating the difference, three long-length distributed FBG sensors, which are originally uniform and have the same Bragg wavelength, are successfully multiplexed with 1 kHz sampling rate.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2011.2163703