研究目的
To develop a thin fiber laser hydrophone (FLH) with static pressure equalization, enhanced dynamic pressure sensitivity and broadband flat response.
研究成果
The prototype FLH is 7.2 mm in radius and has an flat in-water dynamic response of 9×10-3 pm/Pa (120 dB re Hz/Pa) over a bandwidth from 40 Hz to 4 kHz. The NEP is about 50 μPa/√Hz at 1 kHz, which is 6 dB lower than that of DSS0. The static pressure sensitivity is ?11×10-6 pm/Pa (62.8 dB re Hz/Pa at 0 Hz) in the measurement range of 0 to 3 MPa.
研究不足
The study does not discuss the long-term stability of the FLH under varying environmental conditions or the scalability of the manufacturing process for mass production.
1：Experimental Design and Method Selection:
The study combines a capillary tube with an elastic cavity to develop the FLH. The effect of the elasticity of the compensation body on the sensitivity and response is analyzed.
2：Sample Selection and Data Sources:
The FLH model has a stainless steel shell with an outer diameter of
3：2 mm. The diaphragm was made of polyimide film with a thickness of 150 μm. List of Experimental Equipment and Materials:
Includes a DFBFL, a capillary glass tube, and a rubber compensation body.
4：Experimental Procedures and Operational Workflow:
The sensor was made using the same parameters as the simulation. The in air response of the hydrophone was measured by comparing the output to that of a calibrated reference microphone.
5：Data Analysis Methods:
The phase output was converted to laser wavelength change by a specific formula.
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