Hot-wire Anemometer Based on Etched Fiber Bragg Grating Coated with Silver Film

Chen, Xuke; Dong, Xinyong; Sun, Yixiang; Peng, Yingquan; Bai, X. Q.; Dai, Qinyong

doi:10.1109/icocn.2019.8933982

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…As an ideal alternative to traditional electronics or microelectromechanical systemsbased flow sensors under harsh environments, many flow sensors based on optical fiber sensing technology have been studied and reported over the past two decades. Different types of fibers and thermal coupling structures were used for designs of optical fiberbased flow sensors with hot wire measuring principles, such as single-mode-multimode junction [2,3], high-attenuation fiber (HAF) [4], no-core fiber [5], long-period grating/fiber Bragg grating (FBG) structure [6], core-offset fiber structure [7,8], fiber taper structure [9][10][11], etc. Among these studies, various types of FBGs were mostly used as the sensing element for indirect flow information acquisitions through measurements of reflection spectrum shift.…”

Section: Introductionmentioning

confidence: 99%

Distributed Airflow Sensing Based on High-Spatial-Resolution BOTDA and a Self-Heated High-Attenuation Fiber

Zhang

Lei

Zhou

et al. 2022

Sensors

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An all-fiber distributed airflow sensing method based on a differential pulse-width pair Brillouin optical time domain analysis (DPP-BOTDA) and a self-heated high-attenuation fiber (HAF) is proposed and demonstrated. The HAF heated the sensing fiber, producing a gradient temperature distribution in it through physical contact, where the temperature distribution was obtained by DPP-BOTDA with a spatial resolution of 5 cm. The heat loss caused by the airflow was reflected in the decrease in the Brillouin frequency shift and spatially resolved by DPP-BOTDA. Distributed airflow sensing was experimentally demonstrated for measurements of airflow movement, multiple airflow sources and the deflection angle of the airflow. The positioning error of the airflow was no larger than ~2.2 cm; for the deflection angle measurements of the airflow, the maximum demodulation error was 2.5° within the angle range of 0–30°.

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