期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 23, 期 13, 页码 905-907出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2011.2142413
关键词
Airflow; air-gaps; Fabry-Perot interferometer; fiber-optics component; fiber sensors
资金
- National Science Council of the Republic of China [NSC 98-2221-E-239-002-MY2]
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 similar to 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)).
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