Fiber Specklegram Sensor Dataset for Temperature Prediction

The dataset comprises 601 speckle patterns generated by modal interference in a mul- timode optical fiber, capturing temperature-induced variations from 0 °C to 120 °C in 0.2 °C increments. Modal interference occurs when multiple modes with distinct phase velocities and propagation constants overlap, causing constructive and destructive interference across the fiber’s cross-section and producing observable speckle patterns. The experimental setup  uses a 650 nm semiconductor laser coupled into the multimode fiber via a tail fiber and flange. A heater precisely controls the fiber’s temperature, altering its refractive index and dimensions. An industrial CCD camera captures the speckle patterns, which are then computationally analyzed to study temperature-induced modal interference effects.

本数据集包含601幅由多模光纤（multimode optical fiber）中模式干涉（modal interference）生成的散斑图案（speckle patterns），采集了温度以0.2℃为步长从0℃变化至120℃过程中，温度诱导产生的多组散斑数据。模式干涉指当多个具有不同相速度与传播常数的模式发生交叠时，会在光纤横截面产生相长干涉与相消干涉，进而形成可观测的散斑图案。本实验装置采用650 nm半导体激光器（semiconductor laser），通过尾纤（tail fiber）与法兰盘（flange）将激光耦合入多模光纤；通过加热器精准调控光纤温度，以此改变光纤的折射率与几何尺寸。随后利用工业CCD相机（CCD camera）采集散斑图案，并通过计算分析手段对温度诱导的模式干涉效应展开研究。