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总览 评价 杨玮萍 , 郑宾 , 郭华玲 * ( 中北大学计算机与控制工程学院,太原 030051; ) 摘要: 在激光超声无损检测中,当入射的超声波遇到结构损伤时,部分入射波会被反射。对反射波信号的分析处理可以实现对损伤的检测与评估,但是反射波信号往往被淹没
杨玮萍, 郑宾, 郭华玲*
(
中北大学计算机与控制工程学院,太原 030051; )
摘要:
在激光超声无损检测中,当入射的超声波遇到结构损伤时,部分入射波会被反射。对反射波信号的分析处理可以实现对损伤的检测与评估,但是反射波信号往往被淹没在入射的超声波信号里。为了有效地利用反射波信号来分析结构损伤的位置和大小,开展了增强反射波信号算法的研究。首先对激光B扫描铝板得到的一系列超声波信号进行时间和空间上的匹配,然后用匹配之后的信号减去基准点信号,这样差值信号减弱了入射波,增强了反射波。实验显示,在测试表面有裂纹的铝板时,反射波明显增强了,信噪比提高了13.62dB。因此,增强反射波的算法研究对探测和评估裂纹表面的裂纹是十分必要的。
关键词:
信号与信息处理;激光超声;无损检测;算法
YANG Weiping, ZHENG Bin, GUO Hualing*
(
School of computer science and control engineering,The North University of China,taiyuan 030051; )
Abstract:
When the incident ultrasonic wave comes across the structural damage in the laser ultrasonic nondestructive detection, part of the incident wave is reflected. The detection and assessment for damage can be achieved through the processing and analysis for the reflected wave, but the reflection wave tends to be submerged in the incidence wave. In order to use the reflected wave to study the size and location of the structural damage effectively, the article carried out the algorithm research for the enhancement of reflected wave. Firstly, match a series of ultrasonic signal get by the laser B scanning on the aluminum plate in time and space. Then the matched signals subtract the benchmark signal. The difference signals weaken the incident wave and enhance the reflected wave. The experiments have shown that in the test of aluminum plate with a surface crack, the reflection wave enhanced significantly and SNR increased 13.62dB. Therefore, the algorithm study for the enhancement of reflection wave is very necessary.
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