研究目的
To develop a fiber optic Fabry-Perot cavity pressure sensor for harsh environments like oil and gas wells, addressing issues of temperature, pressure, and corrosion resistance.
研究成果
The developed sensor demonstrates high performance with a pressure range of 0-72 MPa, resolution better than 0.005 MPa, linear fit of 1.00000, repeatability of 0.02% F·S, and hysteresis less than 0.02% F·S, making it suitable for harsh oil and gas well environments.
研究不足
The paper does not explicitly mention limitations, but potential areas could include the specific environmental conditions tested (e.g., only up to 150°C and 72 MPa) and the materials used (quartz glass).
1：Experimental Design and Method Selection:
The sensor is based on a Fabry-Perot interferometer with a helical tube to isolate the measured medium and a fiber Bragg grating for temperature compensation. Fabrication uses CO2 laser thermal bonding.
2：Sample Selection and Data Sources:
Not specified in the provided text.
3：List of Experimental Equipment and Materials:
Includes piston gauges (GE 3100), oven (FM841-3), high-pressure pipe, signal demodulators, quartz capillary, incident fiber, reflective fiber, and helical tube.
4：Experimental Procedures and Operational Workflow:
Pressure tests are conducted using a piston gauge to apply pressure from 0 to 72 MPa at 150°C, with measurements of cavity length changes. Repeatability and hysteresis tests involve multiple pressure cycles.
5：Data Analysis Methods:
Linear fitting of cavity length vs. pressure data to determine sensitivity, resolution, repeatability, and hysteresis.
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