数字信号相关法在船闸人字闸门母材厚度测量中的应用

针对超声测厚的精度问题,分析了超声回波时间差的识别计算方法,并提出了一种基于最小二乘多项式拟合的方法来提取相关系数峰值。该方法可兼顾回波时差的计算精度和计算复杂度,得到较准确的时差计算值。该方法应用到湘江二级航道二期工程二线船闸人字闸门母材厚度测量中,测量结果准确可靠,为人字闸门等金属结构的质量控制提供准确的数据支撑。

Application of digital signal correlation method in thickness measurement of base metal of miter gate

Aiming at the problem of ultrasonic thickness measurement accuracy,this paper analyzes the recognition and calculation method of ultrasonic echo time difference,and proposes a method based on least squares polynomial fitting to extract the peak of correlation coefficient.The method considers the calculation accuracy and computational complexity of the echo time difference,and obtains a more accurate time difference calculation value.The method is applied to the measurement of the thickness of the base metal of the second-line ship lock miter gate of the second phase of Xiangjiang second-class channel,thus the measurement results are accurate and reliable,and provide accurate data support for the quality control of metal structures such as herringbone gates.