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Indexed by:期刊论文

Date of Publication:2019-04-01

Journal:IEEE SENSORS JOURNAL

Included Journals:SCIE、EI

Volume:19

Issue:7

Page Number:2592-2597

ISSN No.:1530-437X

Key Words:Fiber-optic anemometer; long-period fiber grating; carbon nanotube; temperature

Abstract:We report a low-power-consumption fiber-optic "hot wire" anemometer based on long-period grating (LPG) with single-wall carbon nanotubes (SWCNTs) coating. A uniform SWCNT film is deposited on a hare LPG acting as both light coupling and sensing element. By carefully selecting the order of the cladding mode and operating wavelength, the LPG shows a much higher temperature sensitivity than that of a regular fiber Bragg grating. Besides, SWCNT is a single-wall cylindrical nanostructure material with excellent absorption in the infrared range and high-thermal conductivity. Due to these two features, the proposed sensor has extremely low-power consumption and simple operation by utilizing a broadband light source as both heating source and probing light source. A sensitivity of 102.5 pm/(m/s) at the wind speed of 1 m/s was obtained experimentally with 1.6-mu m-thick SWCNT film.