All-optical fiber anemometer based on laser heated fiber Bragg gratings

Shaorui Gao, Aping Zhang, Hwa Yaw Tam, L. H. Cho, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

135 Citations (Scopus)


A fiber-optic anemometer based on fiber Bragg gratings (FBGs) is presented. A short section of cobalt-doped fiber was utilized to make a fiber-based "hot wire" for wind speed measurement. Fiber Bragg gratings (FBGs) were fabricated in the cobalt-doped fiber using 193 nm laser pulses to serve as localized temperature sensors. A miniature all-optical fiber anemometer is constructed by using two FBGs to determine the dynamic thermal equilibrium between the laser heating and air flow cooling through monitoring the FBGs' central wavelengths. It was demonstrated that the sensitivity of the sensor can be adjusted through the power of pump laser or the coating on the FBG. Experimental results reveal that the proposed FBG-based anemometer exhibits very good performance for wind speed measurement. The resolution of the FBG-based anemometer is about 0.012 m/s for wind speed range between 2.0 m/s and 8.0 m/s.
Original languageEnglish
Pages (from-to)10124-10130
Number of pages7
JournalOptics Express
Issue number11
Publication statusPublished - 23 May 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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