超声波厚度测量方法和基于采样重建和相位特征提取的系统实施.
Wenqiang Gong1, Xuanze Wang1, Zhenyu Yang1
1Hubei Key Laboratory of Modern Manufacturing Quantity Engineering, College of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China.
Sensors (Basel, Switzerland)
|November 25, 2023
概括
这项研究引入了一种使用常规采样频率的新型超声波厚度测量方法. 它通过重建信号并将FFT与正弦拟合相结合来实现高精度,从而降低了系统的复杂性和成本.
科学领域:
- 材料科学与工程 材料科学与工程
- 非破坏性测试 不破坏性测试
- 信号处理 信号处理
背景情况:
- 传统的超声波厚度测量系统需要高采样频率,复杂的电路设计和增加成本.
- 精确提取超声波回声信号特征以精确测定厚度仍然是一个重大挑战.
研究的目的:
- 提出一种新的方法来采集高频超声波回声信号,使用传统的采样频率,绕过尼奎斯特-香农的限制.
- 提高超声波厚度测量系统的精度,降低其复杂性和成本.
主要方法:
- 实施了改进的采样重建技术,通过重新排列多周期信号来增加等效采样频率.
- 采用混合方法,将快速里叶变换 (FFT) 结合起来,以粗略估计和移动正弦拟合用于精确的相位提取.
- 解决了传统方法的局限性,如峰值检测,信封检测和希尔伯特自相关性.
主要成果:
- 在钢块上实现了高精度的厚度测量,在3毫米至20毫米厚度之间,误差为±0.01毫米.
- 在1毫米至50毫米的厚度中,测量误差为±0.05毫米.
- 成功克服了现有系统固有的高频数据采集和低测量精度的局限性.
结论:
- 拟议的方法有效地采集使用常规采样频率的高频超声波回声信号,使精确的厚度测量.
- 信号重建和先进估计算法的组合显著提高了测量精度,同时简化了系统设计.
- 这种方法为超声波厚度测量提供了一个具有成本效益和准确的解决方案,用于广泛的材料厚度.
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