研究目的
To design and evaluate a high dynamic range and high accuracy flow sensor for quantifying mixing in the atmosphere and ocean, focusing on sensitivity to sensor orientation and comparison with existing methods.
研究成果
The fiber-optic flow sensor achieves a high dynamic range of O(10^6) with tunable sensitivity via heating power adjustment. It performs well in low flow conditions with minimal intrusion but requires further optimization for orientation insensitivity and validation through field comparisons with PIV and ADCP systems.
研究不足
The sensor shows orientation dependency with up to 28% variance in flow rate estimation, particularly at 180 degrees. Dynamic response may not fully match ADV at high flow rates due to differences in sampling rates and potential issues with particle distribution in ADV measurements. Field testing is pending to confirm performance in real oceanic environments.
1：Experimental Design and Method Selection:
The experiment uses a fiber-optic temperature sensor based on a silicon Fabry-Perot interferometer (FPI) heated by a 980nm laser to measure flow velocity through convective heat loss. The design involves a single sensor node to minimize self-shading and complexity compared to multi-node approaches.
2：Sample Selection and Data Sources:
Tests are conducted in a lab tank with controlled water flow, using a computer-controlled mechanical syringe for flow generation and comparison with an acoustic Doppler velocimeter (ADV).
3：List of Experimental Equipment and Materials:
Equipment includes a silicon FPI sensor, single-mode fiber, 980nm laser, wavelength division multiplexer (WDM), mechanical syringe, Nortek Vector ADV, and data acquisition systems. Materials include water and seeding particles (Arizona dust).
4：Experimental Procedures and Operational Workflow:
The sensor is heated with the laser, and flow is introduced at various rates and orientations (angles from 0 to 180 degrees in 45-degree steps). Temperature changes are measured via wavelength shifts in the FPI, with data collected at 1kHz. Comparisons are made with ADV measurements.
5：Data Analysis Methods:
Data is analyzed to determine sensitivity (nm/(m/s)), dynamic range, and orientation effects using statistical methods and comparison plots.
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