研究目的
To propose and demonstrate a new concept for an all-optical thermal vacuum gauge based on a dual, parallel-fiber configuration for gas pressure sensing.
研究成果
The study successfully demonstrates an all-optical thermal vacuum gauge using a dual-fiber configuration. The system operates effectively in a pressure range from 20 mTorr to Standard Pressure and shows potential as a sensitive flow rate sensor. Future work includes optimizing the system for different operational modes and materials to improve low-pressure accuracy.
研究不足
The system's accuracy at pressures below 100 mTorr is affected by outgassing from the acrylic chamber material. The distance between the fibers influences the dominance of conductive versus radiative heat transfer, affecting sensitivity.
1：Experimental Design and Method Selection:
The study utilizes a dual-fiber arrangement where one fiber serves as a heat source and the other as a thermal transport sensor. The heat-generating fiber is a luminescence-quenched, Yb3+-doped optical fiber, and the temperature sensor is a commercial fiber Bragg grating (FBG).
2：Sample Selection and Data Sources:
The fibers are placed in a custom vacuum chamber with controlled internal pressure. The FBG's transmission spectrum is measured to determine the pressure-dependent thermal conductivity.
3：List of Experimental Equipment and Materials:
Includes a Yb3+-doped optical fiber, commercial FBG, vacuum chamber, laser diode for pumping, white light source, and optical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
The vacuum chamber's pressure is varied, and the FBG's transmission spectrum is recorded for different pump powers and pressures.
5：Data Analysis Methods:
The FBG's spectral shifts are analyzed to correlate with the chamber's pressure, demonstrating the system's sensitivity to pressure changes.
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