ZHAO Xue-fang, WANG Xin-huai, DONG Xin-yong. FBG hot-wire anemometer based on incorporating with waist-enlarged fiber bitaper[J]. 2015, 34(10): 57-59+62.
A hot-wire anemometer based on a silver-coated fiber Bragg grating( FBG) incorporating with a waistenlarged fiber bitaper is proposed. The waist-enlarged fiber bitaper couples the light from a pump laser propagating along the fiber into the fiber cladding
the light is absorbed by silver film and generate heat
which increases temperature of the FBG. Air flow cools down the FBG and shifts the Bragg wavelength to shorter wavelength. FBG wavelength shifts with the change of temperature. Anemometer is therefore realized by monitoring the wavelength changes of the FBG. Experimental results show that the measurement range is 0
13. 7 m / s
the sensitivity is up to1. 0 nm /( m / s) and resolution is 0. 001 m / s.
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