Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 9, Pages 3010-3015Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3137239
Keywords
Fluid flow measurement; Temperature measurement; Light sources; Probes; Sensitivity; Interference; Polymers; Fabry-Perot interferometer; optical fiber sensor; thermal anemometer
Funding
- National Key Research and Development Program of China [2020YFB1805804]
- Open Projects Foundation of the StateKey Laboratory of Optical Fiber and Cable Manufacture Technology [SKLD1905]
- National Natural Science Foundation of China [61775204, 11974083]
- Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2019ZT08X340]
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A fiber thermal anemometer with a light source-heated Fabry-Perot interferometer is proposed in this study. It achieves high sensitivity and fast response and recovery time by detecting the wavelength shift of the interference fringe to measure airflow velocity.
An optical fiber thermal anemometer with a light source-heated Fabry-Perot interferometer (FPI) is proposed. The FPI is fabricated on the tip of a single-mode fiber using an ultraviolet-cured adhesive. A broadband light source acts as a heating light source as well, eliminating the need for a heating resistor or a pump laser which are usually required in optical fiber thermal anemometers. The interference fringe of the FPI shifts with airflow velocity because airflow not only reduces temperature of the FPI but also introduces strain due to wind force. Airflow velocity is therefore measured by detecting wavelength shift of the interference fringe. In the experiment, a high sensitivity up to -3.13 nm/(m center dot s(-1)) was achieved at the low velocity region, reducing to similar to-0.2 nm/(m center dot s(-1)) at the high velocity region within the measurement range of 0-7 m/s. The response and recovery time is 250 and 580 ms, respectively. It is worth noting that the anemometer maintains a relatively high sensitivity at the high velocity region due to the contribution of wind force effect that makes it outperform most of the fiber thermal anemometers.
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