Open-Source Multi-Sensor Eddy Current Database for Non-Destructive Characterization of Carbon Fiber Structures

This dataset contains 738 multi-frequency eddy current scans of carbon fibre structures (CFRP) composite specimens, acquired with the EddyCus® Integration Kit (Fraunhofer IKTS, Dresden). All scans are provided in structured HDF5 format with full measurement metadata, material properties, and defect labels. The dataset is intended for non-destructive testing (NDT) research, machine learning benchmarking, sensor comparison studies, and fibre orientation analysis of composite materials. --- SENSORS Absolute sensors: S13131 — 7.3 MHz, 3.3 mm coil S13132 — 6.1 MHz, 5.8 mm coil S22329 — 18.1 MHz, 3.3 mm coil Differential (half-transmission) sensors: S14150 — 9.2 MHz, 5.8 mm coil, 6.3 mm spacing S14152 — 24.3 MHz, 3.3 mm coil, 3.5 mm spacing S15172 — 8.5 MHz, 2.4 mm coil, 2.4 mm spacing S17257 — 17.0 MHz, 7.0 mm coil, 7.0 mm spacing S22330 — 6.5 MHz, 2.4 mm coil, 2.4 mm spacing All sensors manufactured by Fraunhofer IKTS, Dresden. --- MATERIAL SYSTEMS The base textiles are primarily of three different types and all consist of high tenacity carbon fibers: (i) A commercially available unidirectional non-crimp fabric made off individual 50 K rovings, which are bonded togetherby a polyester stitch yarn (HP-U300/122C by HP-Textiles GmbH, Schapen, Germany). (ii) A commercially available unidirectional non-crimp fabric made off 50 K CF rovings, which were spread to form a more homogeneous fabric and bonded by an adhesive thread grid (Carbon fiber non-crimp fabric ST 50 g/m² by R\&G Faserverbundwerkstoffe GmbH, Waldenbuch, Germany). (iii) Carbon fiber non-crimp fabrics produced at the Institute of Textile Technology and High Performance MaterialTechnology (ITM) of TUD Dresden University of Technology. These were produced on the basis of 12 K fibers (HTS40 12K, Toho Tenax Europe GmbH, Wuppertal, Germany) on the institute's Malitronic Multiaxial Stitch Bonding Machine. --- DEFECT CATEGORIES Reference — no defect 84 scans Gap (missing rovings) 492 scans Layer with false orientation 80 scans PTFE film insert 24 scans Copper film insert 24 scans Copper coated roving inserted 24 scans Ondulation (fibre waviness) 6 scans Fuzzy Ball (fibre contamination) 4 scans --- HDF5 FILE STRUCTURE Each file contains four top-level groups: measurement_metadata/ — sensor type, datetime, temperature, frequency settings frequencies/ — per-channel: frequency (MHz), gain (dB), phase offset sample_properties/ — material, layup, thickness, defect type/size/depth spatial_data/ — x_mm, y_mm, z_mm, track and sample indices signal_data/fN/ — real, imaginary, complex_impedance (compound dtype) analysis_results/fN/ — magnitude, phase_degrees, phase_radians Data is compressed with gzip (level 6) + shuffle filter. Typical file size: 50–500 KB. --- SOFTWARE The open-source Python pipeline used to generate this dataset is available at:https://github.com/johannesmersch/eddycus-hdf5-converter (MIT License, v1.1.0) It provides: - EddyCus .txt → HDF5 conversion with full metadata - SQLite database for indexing and querying scans - Phase rotation for contrast optimisation - Fourier-based fibre orientation detection - Command-line interface and Python API Requirements: Python 3.9+, numpy, pandas, h5py, scipy, scikit-image, matplotlib --- RELATED PUBLICATION Mersch, J. et al. (in preparation). An Open-Source Multi-Sensor Eddy Current Database for Non-Destructive Characterization of Carbon Fiber Structures and Analysis Framework for Eddy Current Inspection of CFRP Composites. --- LICENSE Data: Creative Commons Attribution 4.0 International (CC BY 4.0)Software: MIT License本数据集包含738组碳纤维增强复合材料（Carbon Fiber Reinforced Polymer，简称CFRP）试样的多频涡流（eddy current）扫描数据，采集自德国德累斯顿弗劳恩霍夫材料与束技术研究所（Fraunhofer IKTS）的EddyCus®集成套件。所有扫描数据均采用结构化HDF5格式存储，包含完整的测量元数据、材料属性与缺陷标注。 本数据集旨在用于无损检测（Non-Destructive Testing，简称NDT）研究、机器学习基准测试、传感器对比研究以及复合材料纤维取向分析。 --- 传感器 绝对式传感器： S13131 — 7.3 MHz，线圈尺寸3.3 mm S13132 — 6.1 MHz，线圈尺寸5.8 mm S22329 — 18.1 MHz，线圈尺寸3.3 mm 差分式（半透射式）传感器： S14150 — 9.2 MHz，线圈尺寸5.8 mm，线圈间距6.3 mm S14152 — 24.3 MHz，线圈尺寸3.3 mm，线圈间距3.5 mm S15172 — 8.5 MHz，线圈尺寸2.4 mm，线圈间距2.4 mm S17257 — 17.0 MHz，线圈尺寸7.0 mm，线圈间距7.0 mm S22330 — 6.5 MHz，线圈尺寸2.4 mm，线圈间距2.4 mm 所有传感器均由德国德累斯顿弗劳恩霍夫材料与束技术研究所制造。 --- 材料体系 基底织物主要分为三类，均采用高韧性碳纤维制备： （i）市售单向非卷曲织物：以单股50K粗纱为原料，通过聚酯缝编纱线进行粘结（型号HP-U300/122C，供应商为德国沙彭市HP-Textiles GmbH）。 （ii）另一款市售单向非卷曲织物：以50K碳纤维粗纱为原料，经展纤处理以获得更均匀的织物结构，通过胶粘纱线网格进行粘结（型号为碳纤维非卷曲织物ST 50 g/m²，供应商为德国瓦登布赫市R&G Faserverbundwerkstoffe GmbH）。 （iii）由德累斯顿工业大学纺织技术与高性能材料研究所（ITM）制备的碳纤维非卷曲织物：采用12K纤维（型号HTS40 12K，供应商为德国伍珀塔尔市东丽特克斯欧洲有限公司Toho Tenax Europe GmbH），在研究所的Malitronic多轴向缝编机上完成生产。 --- 缺陷类别 参考样本：无缺陷，共84组扫描数据 间隙缺陷（粗纱缺失）：共492组扫描数据 纤维铺层取向错误：共80组扫描数据 聚四氟乙烯（PTFE）薄膜植入缺陷：共24组扫描数据 铜箔植入缺陷：共24组扫描数据 涂铜粗纱植入缺陷：共24组扫描数据 纤维波纹缺陷：共6组扫描数据 纤维球污染缺陷：共4组扫描数据 --- HDF5文件结构 每个HDF5文件包含四个顶层组： measurement_metadata/ — 包含传感器类型、采集时间、环境温度、频率设置等测量元数据 frequencies/ — 按通道记录频率（单位：MHz）、增益（单位：dB）与相位偏移 sample_properties/ — 包含材料类型、铺层结构、厚度以及缺陷类型/尺寸/深度等试样属性 spatial_data/ — 包含x轴坐标（单位：mm）、y轴坐标（单位：mm）、z轴坐标（单位：mm）以及扫描轨迹与试样索引 signal_data/fN/ — 包含实部、虚部以及复阻抗（复合数据类型） analysis_results/fN/ — 包含信号幅值、相位（角度制）与相位（弧度制） 数据采用gzip压缩（压缩级别6）与shuffle过滤算法进行存储，单文件典型大小为50~500 KB。 --- 软件工具 本数据集所使用的开源Python处理工具链已开源，仓库地址为：https://github.com/johannesmersch/eddycus-hdf5-converter，采用MIT许可证（MIT License）v1.1.0版本。 该工具链支持以下功能： - 将EddyCus生成的.txt格式文件转换为HDF5格式，并保留完整元数据 - 支持使用SQLite数据库对扫描数据进行索引与查询 - 支持相位旋转以优化扫描对比度 - 支持基于傅里叶变换的纤维取向检测 - 提供命令行接口与Python应用程序编程接口 运行依赖：Python 3.9及以上版本，以及numpy、pandas、h5py、scipy、scikit-image、matplotlib库。 --- 相关发表论文 Mersch J. 等（待发表）：《面向碳纤维结构无损表征的开源多传感器涡流数据库及CFRP复合材料涡流检测分析框架》 --- 许可证 数据集：知识共享署名4.0国际许可协议（Creative Commons Attribution 4.0 International，简称CC BY 4.0） 软件：MIT许可证（MIT License）