研究目的
Investigating the performance of a novel fiber optic hot-wire anemometer based on an Sn metal airgap fiber Fabry–Pérot interferometer for airflow measurement.
研究成果
The proposed Sn metal AG-FFPI anemometer demonstrates good sensitivity and high resolution to variations in airflow speed, with an average sensitivity of 0.62 nm/(m/s) over the range of 0–10 m/s. The sensor's simple design and operation suggest great commercial potential for various industrial applications.
研究不足
The sensing response weakens at high airflow rates (20–25 m/s), and the process requires precise control of the heating power and cavity length for optimal sensitivity.
1：Experimental Design and Method Selection:
The study involves the design of a fiber optic anemometer using an Sn metal airgap fiber Fabry–Pérot interferometer (AG-FFPI) heated by a 980 nm laser diode (LD). The interferometric mechanism is based on a two-beam interference with low finesse.
2：Sample Selection and Data Sources:
The sensor is fabricated by forming an airgap between the fiber endface and melting Sn metal via an overlaying technique.
3：List of Experimental Equipment and Materials:
Equipment includes an optical spectrum analyzer (OSA, ADVANTEST-Q8381A), broadband light source (BLS, Opto-Link Corporation Limited OLSWB-OESCLU-FA), optical circulator, and a 980 nm pump LD.
4：Experimental Procedures and Operational Workflow:
The Sn metal microcavity is heated by the LD to achieve a steady-state high temperature. Airflow is applied to cool the Sn metal, causing a blue shift in the interference fringes, which is measured by the OSA.
5：Data Analysis Methods:
The wavelength shifts of the interference spectra are analyzed to determine airflow speed, with sensitivity calculated based on the shift.
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