Simulating Focused Ultrasound Transducers using Discrete Sources on Regular Cartesian Grids

This data was collected in order to validate models of curved sources on cartesian grids. A single element spherically focusing ultrasound transducer (H101 at 1.1 MHz, Sonic Concepts) was used to generate an acoustic field. Measurements were performed with a 0.2 mm PVDF needle hydrophone (Precision Acoustics) to characterise the source under quasi continuous wave and short burst conditions. These measurements include planar scans in the prefocal region for the two driving regimes, and axial scans at the same drive level for both drive regimes. There are additional axial scans at one further higher drive level (very weakly nonlinear) for each of the driving regimes which were acquired for comparison with the model with scaled input source amplitude. All measurements were acquired using an automated scanning tank filled with degassed, deionised water. The transducers mounted in a fixed xyz position with automated tilt, rotate adjustment. Hydrophones were mounted on an automated xyz stage, with manual tilt, rotate adjustment. In total this study contains 6 datasets contained in one file, the corresponding figure or table in the paper is given in brackets: 1: Planar scan with 45 cycle burst (qCW) at z = 42.5 mm, linear field 2: Axial scan 45 cycle burst (qCW), linear field (conditions as in 1), Fig 8, 9. 3: Axial scan 45 cycle burst (qCW), weakly nonlinear field, Fig 8, 9. 4: Planar scan with 4 cycle burst at z = 42.5 mm, linear field 5: Axial scan 4 cycle burst, linear field (conditions as in 4), Fig 10, 11. 6. Axial scan 4 cycle burst, weakly nonlinear field, Fig 10, 11.<br>

本数据集用于验证笛卡尔网格下的曲源模型。实验采用Sonic Concepts公司生产的H101型单阵元球面聚焦超声换能器（工作频率1.1 MHz）产生声场，借助Precision Acoustics公司的0.2毫米PVDF针式水听器，在准连续波（quasi continuous wave，简称qCW）与短脉冲串两种驱动模式下对该换能器的声场特性开展表征。本次测量包含两种驱动模式下的焦前平面扫描，以及相同驱动电平下的轴向扫描。此外，针对两种驱动模式，还分别采集了一组更高驱动电平下的轴向扫描数据（处于极弱非线性状态），用于与输入源振幅缩放后的模型进行对比验证。所有测量均通过装载脱气去离子水的自动化扫描水箱完成：换能器固定于带有自动俯仰、旋转调节功能的xyz安装座上；水听器搭载于具备手动俯仰、旋转调节功能的自动化xyz位移平台。本研究共包含6个数据集，统一存储于单个文件中，各数据集对应论文中的图表标注如下（括号内为对应图表编号）：
1. z=42.5 mm处的45周期脉冲串准连续波平面扫描，线性声场
2. 45周期脉冲串准连续波轴向扫描，线性声场（实验条件同数据集1，对应论文图8、图9）
3. 45周期脉冲串准连续波轴向扫描，弱非线性声场（对应论文图8、图9）
4. z=42.5 mm处的4周期脉冲串平面扫描，线性声场
5. 4周期脉冲串轴向扫描，线性声场（实验条件同数据集4，对应论文图10、图11）
6. 4周期脉冲串轴向扫描，弱非线性声场（对应论文图10、图11）