Low-frequency ultrasound data (pulse-echo technique) with shear horizontal and longitudinal waves on a reference polyamide specimen “BAM-Pk218”

This dataset contains raw data observed with ultrasound measurements on a polyamide reference specimen at Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin. The internal specimen identifier is „Pk218“. The measurements were conducted using the pulse-echo method. The upper surface of the specimen was defined as measuring area. The aim of the measurements was to determine both the specimen thickness and the position of a hole drilled parallelly to the measuring area. The cuboidal specimen was made of the isotropic-homogeneous material polyamide PA6. The geometrical dimensions are l=1000 mm (length l corresponds to x-axis), b=600 mm (width b corresponds to y-axis) and d=294,5 mm (thickness d corresponds to z-axis). The hole was drilled through the entire width in y-direction and is parallel to the surfaces x/y and y/z. The hole diameter is D=50 mm. The depth of the hole centre is t=194,7 mm (z-axis) in relation to the measuring area, where z=0 mm. The lateral hole position is x=600 mm. The measurements were conducted with both commercially available and self-developed equipment. The ultrasonic probes M2502 (Dual Aperture Shear Wave DPC Transducer Array) and M2503 (Dual Aperture Longitudinal Wave DPC Transducer Array) are manufactured by the Acoustic Control Systems – ACS Group. The used pulse generator is a BAM in-house development. For data acquisition, a National Instruments USB-6316 system in 16-bit format has been used. The measurements were performed mechanized with an automated scanner system which was designed at BAM. The scanner is operated with a self-developed control and data acquisition software based on the programming language LabVIEW. The measuring grid consists of x=101 and y=61 measuring points with a spacing of 10 mm in both directions. At each point, 4.000 samples were recorded with a sampling rate of 2 MS/s. The stored data are 16-bit (signed oder unsigned) integers in the range of A=±2000 mV. Two sets of data are provided, with the direction of polarization of the shear wave differing (x- and y-polarization, respectively). The datasets contain the x- and y- coordinates of the individual measuring points in mm as well as the z-position of the samples in µs. The raw data are store line by line in x-direction. The data is provided in the format *.csv and additionally in *.npy (Python).

本数据集包含德国联邦材料研究与测试研究所（Bundesanstalt für Materialforschung und -prüfung，BAM）柏林分部对聚酰胺参考试样开展超声测量所得到的原始观测数据。试样内部编号为"Pk218"。本次测量采用脉冲回波法实施，以试样上表面作为测量区域，旨在同时测定试样厚度与平行于该测量区域钻制的孔洞位置。该长方体试样由各向同性均质材料聚酰胺PA6制成，几何尺寸为：长度l=1000 mm（长度l对应x轴）、宽度b=600 mm（宽度b对应y轴）以及厚度d=294.5 mm（厚度d对应z轴）。该孔洞沿y方向贯穿整个试样宽度，且平行于x/y与y/z平面，直径为D=50 mm；其中心相对于测量区域（即z=0 mm处）的深度为t=194.7 mm（沿z轴方向），横向位置为x=600 mm。本次测量所用设备涵盖商用设备与自研设备两类。所用超声探头包括M2502（双孔径剪切波DPC换能器阵列）与M2503（双孔径纵波DPC换能器阵列），均由声学控制系统集团（Acoustic Control Systems – ACS Group）制造，所用脉冲发生器为BAM自研设备。数据采集采用16位格式的美国国家仪器（National Instruments）USB-6316系统。测量工作由BAM自研的自动化扫描系统完成，该系统搭载基于LabVIEW编程语言开发的自研控制与数据采集软件进行操控。测量网格包含x方向101个、y方向61个测量点，两个方向的测点间距均为10 mm。每个测点采集4000组样本，采样率为2 MS/s。所存储的数据为幅值范围±2000 mV的16位有符号或无符号整数。本次提供两组数据集，二者的剪切波极化方向不同，分别为x极化与y极化。数据集包含各测量点的x、y坐标（单位：mm）以及样本的z轴位置信息（单位：µs）。原始数据沿x方向逐行存储。数据以*.csv格式提供，同时附带*.npy（Python）格式文件。