Multiphase systems are often accompanied by highly complex gas-liquid-solid interactions and interface behaviors, which are difficult to be captured directly. This work reports theoretically and experimentally the studies on monitoring the dynamic behaviors of the gas bubbles in liquid by using a tapered dual-hole optical fiber-based interferometer. As demonstrated by regulating their size, quantity, and arrangement, gas bubbles touching the waist region of the tapered fiber lead to a spectral response of the interferometer, and the total area of the gas-solid interface between them directly determines the wavelength shift of the output spectrum. Beyond that, the sensor with the uniform tapered waist region (length: 1.5 cm, diameter: Ф 5 μm) is fabricated to explore the gas bubbles’ coalescence. In this case, the gas bubbles contact each other until the waist region of tapered fiber is radially enclosed entirely. When the enclosed gas-solid interface area varies between 16,000 - 24,000 µm², the wavelength shift responds exponentially to the area, and the sensitivity at the area of 16,000 µm² is calculated to be 2.42 pm/μm². The proposed sensing platform could be adapted to in situ and online explore the multiphase dynamics for applications such as cell analysis, energy production, and environmental monitoring.

多相系统往往伴随着高度复杂的气-液-固相互作用和界面行为，很难直接捕捉到。本工作从理论上和实验上报告了使用锥形双孔光纤干涉仪监测液体中气泡动态行为的研究。通过调节它们的大小、数量和排列方式表明，接触锥形光纤腰部的气泡会导致干涉仪的光谱响应，它们之间气固界面的总面积直接决定了光纤的波长偏移。输出频谱。除此之外，具有均匀锥形腰部区域的传感器（长度：1.5 cm，直径：Ф5 μm) 用于探索气泡的聚结。在这种情况下，气泡相互接触，直到锥形纤维的腰部区域被径向完全包围。当封闭的气固界面面积在16,000 - 24,000 µm ²之间变化时，波长偏移对该面积呈指数响应，计算出16,000 µm ²区域的灵敏度为2.42 pm/μm ²。所提出的传感平台可以适应原位和在线探索多相动力学的应用，如细胞分析、能源生产和环境监测。