Abstract
An optical fiber hot-wire anemometer based on an optical fiber bitaper and a silver-coated fiber Bragg grating (FBG) is demonstrated for airflow velocity measurement. The specially-fabricated fiber bitaper with an enlarged waist diameter couples light from a high-power pump laser into cladding area of the fiber and the silver coating absorbs the light to generate heat that increases temperature of the FBG to a certain level. In measurement, air flow takes away some heat and reduces temperature, thus Bragg wavelength of the FBG changes with velocity of air flow according to a certain relationship. Experimental results show that a large measurement range up to 13.7m/s is realized.
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