Air Gap Fiber Fabry-Pérot Interferometer for Highly Sensitive Micro-Airflow Sensing

This work presents a novel sensor based on an air-gap fiber Fabry-Perot interferometer (AG-FFPI) to identify an extremely low airflow velocity. When a micro airflow flows through the upper side of the sensor, an extremely small pressure difference caused by fluid mechanics makes two fiber endfaces t...

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Bibliographic Details
Published in:IEEE photonics technology letters 2011-07, Vol.23 (13), p.905-907
Main Authors: Lee, Cheng-Ling, Hong, Wan-Yu, Hsieh, Hsin-Jung, Weng, Zi-Yu
Format: Article
Language:English
Subjects:
air-gaps
Airflow
Fabry-Pérot interferometer
fiber sensors
fiber-optics component
Interference
Optical fiber cables
Optical fiber sensors
Optical fibers
Sensitivity
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Summary:This work presents a novel sensor based on an air-gap fiber Fabry-Perot interferometer (AG-FFPI) to identify an extremely low airflow velocity. When a micro airflow flows through the upper side of the sensor, an extremely small pressure difference caused by fluid mechanics makes two fiber endfaces tilt upwards and generates a tiny discrepancy between the two aligned fiber endfaces. This discrepancy of the AG-FFPI changes the air gap, and the center wavelength of the specific interference dips. The proposed sensor can determine the velocity of a micro airflow from a surrounding environment within 0 ~ 1.2 m/s. In addition, the wavelength of shifts in interference fringes is nearly proportional to airflow velocity with a high sensitivity of approximately +33.17 nm/(m · s -1 ).
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2011.2142413