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

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2022-05, Vol.22 (11), p.4017
Main Authors: Zhang, Hongying, Lei, Yanyang, Zhou, Jinzhe, Dong, Yongkang
Format: Article
Language:English
Subjects:
Air flow
Attenuation
Brillouin frequency shift
Brillouin optical time domain analysis
Deflection
Demodulation
distributed airflow sensing
Frequency shift
Heat
Heat loss
high-attenuation fiber
Lasers
Light
Microelectromechanical systems
Optics
Pulse duration
Sensors
Spatial resolution
Temperature distribution
Wire
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Summary: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°.
ISSN:1424-8220
1424-8220
DOI:10.3390/s22114017