Fiber-optic thermal anemometer based on metallic coated fiber Bragg grating

Jia Cheng; Yan Zhou; Xinyong Dong; Wenjun Zhou

doi:10.1117/12.970514

17 October 2012 Fiber-optic thermal anemometer based on metallic coated fiber Bragg grating

Jia Cheng, Yan Zhou, Xinyong Dong, Wenjun Zhou

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84214C (2012) https://doi.org/10.1117/12.970514
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

A novel thermal anemometer based on a core offset single-mode fiber (SMF) combined with a fiber Bragg grating (FBG) coated with silver film is proposed. Light from a pump laser at 1450 nm propagating down the fiber is coupled by the offset into the fiber cladding. A silver coating was deposited on the fiber surface over the Bragg grating structure to absorb the light. As a result, the dynamic thermal equilibrium would be reached between the laser heating and air flow cooling by monitoring the FBG's wavelength shift. Experimental results reveal that the Bragg wavelength shift is related to the flow velocity and the highest resolution of the thermal anemometer is about 0.05 m/s in the range of 0-17.31 m/s.

Citation Download Citation

Jia Cheng, Yan Zhou, Xinyong Dong, and Wenjun Zhou "Fiber-optic thermal anemometer based on metallic coated fiber Bragg grating", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84214C (17 October 2012); https://doi.org/10.1117/12.970514

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