研究目的
Investigating the performance of a hot-wire anemometer based on a cladding-etched optical fiber Bragg grating (FBG) coated with silver film for airflow velocity measurement.
研究成果
The etched FBG anemometer shows improved sensitivity and measurement range for airflow velocity, achieving high sensitivity up to ~696.3 pm/(m/s) and covering a range of 0~20 m/s. The design offers advantages such as relatively low cost, easy fabrication, good physical strength, and compact configuration.
研究不足
The sensor is difficult to withstand stronger airflow due to its poor physical strength at higher temperatures.
1：Experimental Design and Method Selection:
The study involves the fabrication of a waist-enlarged fiber bitaper and an etched FBG coated with silver film. The bitaper couples pump laser light into the cladding, which is absorbed by the silver film to generate heat.
2：Sample Selection and Data Sources:
The FBG is etched by hydrofluoric acid and coated with silver film. The airflow velocity is varied from 0 to 20 m/s using a wind tunnel.
3：List of Experimental Equipment and Materials:
Includes a fusion splicer (Fujikura FSM-60s), hydrofluoric acid (30%), silver film, and a wind tunnel.
4：Experimental Procedures and Operational Workflow:
The FBG is etched, coated with silver film, and then subjected to pump laser heating. The Bragg wavelength shift is monitored under varying airflow velocities.
5：Data Analysis Methods:
The relationship between the wavelength shift of the FBG and the airflow velocity is analyzed using a theoretical model.
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