Strain data acquired by an OFDR optic fiber sensor during tensile tests on a double-notched sample for strain gradient imposition

This dataset contains strain measurement data acquired using Rayleigh-based Optical Frequency Domain Reflectometry (OFDR) sensors in a series of controlled experiments designed to investigate the impact of strain gradients on data integrity in such sensors. The dataset supports the findings presented in the associated study: "Investigation of Distributed Optic Fiber Sensors: Data Loss Due to Strain Gradient.". The data helps to analyze the relationship between strain gradients and data loss in OFDR sensors. It provides insights into how gage pitch selection influences data accuracy, particularly in high-gradient regions. Experimental Setup The experiments include tensile tests performed on a double-notched PMMA specimen instrumented with a Rayleigh backscattering-based OFDR sensor. The objective is to analyze data loss when high strain gradients are applied. Test specimen: The primary sample was specifically designed to impose a controlled strain gradient on the optic fiber sensor while ensuring the fiber remained within its elastic strain limit (1.2%). The geometry of the specimen is illustrated in the Figure 8 of the mentioned article. Loading conditions: The tensile tests were conducted under cyclic loading (load/unload cycles) to assess the stability of strain measurements and identify potential thresholds for data loss. Optic fiber sensor: The tests were performed using a Standard single-mode optical fiber. Interrogation system: A Luna ODiSI-6100 series interrogation unit was used for strain data acquisition, operating at different gage pitches (0.65 mm, 1.3 mm, 2.6 mm, and 5.2 mm).本数据集包含基于瑞利散射的光频域反射（Rayleigh-based Optical Frequency Domain Reflectometry, OFDR）传感器采集的应变测量数据，相关受控实验旨在探究应变梯度对该类传感器数据完整性的影响。本数据集支撑关联研究《分布式光纤传感器研究：应变梯度引发的数据丢失》中的结论。该数据集可用于分析OFDR传感器中应变梯度与数据丢失之间的关联，并揭示标距间距（gage pitch）的选择如何影响数据精度，尤其是在高应变梯度区域。 实验设置 本实验包含对搭载基于瑞利背散射OFDR传感器的双缺口聚甲基丙烯酸甲酯（PMMA）试样开展的拉伸试验，目标为分析施加高应变梯度时的数据丢失情况。 试验试样：主试样专为在光纤传感器上施加可控应变梯度而设计，同时确保光纤处于弹性应变极限（1.2%）范围内。试样的几何形状详见上述论文中的图8。 加载条件：本拉伸试验采用循环加载（加载/卸载循环）模式开展，用于评估应变测量的稳定性，并确定数据丢失的潜在阈值。 光纤传感器：本次试验采用标准单模光纤。 解调系统：本次试验采用Luna ODiSI-6100系列解调单元进行应变数据采集，该设备可设置不同标距间距（0.65 mm、1.3 mm、2.6 mm及5.2 mm）。