Fiber-Optic Anemometer Based on Bragg Grating Inscribed in Metal-Filled Microstructured Optical Fiber

A compact all-fiber optical anemometer based on a fiber Bragg grating inscribed in a metal-filled microstructured optical fiber (MOF) is presented. Six-hole MOF (SHMOF) with a suspended core is fabricated to engineer the evanescent field of the fundamental guided mode, and low-melting-point alloy is...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 34; no. 21; pp. 4884 - 4889
Main Authors Jie Wang, Zheng-Yong Liu, Shaorui Gao, Zhang, A. Ping, Yong-Hang Shen, Hwa-Yaw Tam
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2016
Subjects
Fiber gratings
Fluid flow measurement
Metals
microstructured optical fibers
optical fiber devices
Optical fiber sensors
Optical fibers
Temperature measurement
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Summary:A compact all-fiber optical anemometer based on a fiber Bragg grating inscribed in a metal-filled microstructured optical fiber (MOF) is presented. Six-hole MOF (SHMOF) with a suspended core is fabricated to engineer the evanescent field of the fundamental guided mode, and low-melting-point alloy is filled in the micro-holes to achieve highly efficient light-heat conversion. Such a metal-filled SHMOF can strongly absorb pumping light at 1450 nm to generate heat and forms a fiber-optic "hot wire." The Bragg grating at 850 nm is inscribed in the core of SHMOF and acts as an in-fiber sensor for monitoring wind-speed dependent temperature of the "hot wire." Experimental results show the sensitivity of the fiber-optic anemometer is as high as ~0.091 nm/(m/s) at wind speed of around 2 m/s. Such a compact anemometer is promising as a low-power-consumption optical flow-meter for remote sensing and on-chip integration.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2016.2612299