Release Time:2019-07-01  Hits:

Indexed by: Journal Article

Date of Publication: 2019-04-01

Journal: IEEE SENSORS JOURNAL

Included Journals: EI、SCIE

Volume: 19

Issue: 7

Page Number: 2592-2597

ISSN: 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.