Fiber Bragg grating flow sensors powered by in-fiber light

被引：60

作者：

Cashdollar, LJ ^{[1
]}

Chen, KP ^{[1
]}

机构：

[1] Univ Pittsburgh, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA

来源：

IEEE SENSORS JOURNAL | 2005年 / 5卷 / 06期

关键词：

fiber Bragg grating (FBG); optical tuning; thermal gas flow sensor;

D O I：

10.1109/JSEN.2005.855599

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents an active fiber Bragg grating temperature and How sensor based on self-heated optical hot wire anemometry. The grating sensors are directly powered by optical energy carried by optical fibers. In-fiber diode laser light at 910 nm was leaked out from the fiber and absorbed by the surrounding metallic coating to raise the temperature and change the background refractive index distribution of the gratings. When the diode laser is turned off, the grating is used as a temperature sensor. When the diode laser is turned on, the resonance wavelength and spectral width change of the self-heated grating sensor is used to measure the gas flow velocity. The grating flow sensors have been experimentally evaluated for different grating length and input laser power. The grating flow sensors have demonstrated a 0.35- m/s sensitivity for nitrogen flow at atmosphere pressure.

引用

页码：1327 / 1331

页数：5

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