Study of hydraulic pressure sensing characteristics based on micro-cavity structure

The microcavity structure is formed by adding an air cavity at the fusion splice point of single-mode, thin-core fiber and single-mode (STS). This paper takes the microcavity optical fiber sensing structure as the research object, and first analyzes the microcavity optical fiber sensing structure and the principle of temperature sensing, and combined with experiments to study the pressure sensing characteristics of the microcavity sensing structure, the results show that: as the microcavity increases, the range of measurable hydraulic pressure increases, and the sensitivity increases. The best structure is selected for hydraulic pressure sensing detection.