摘要
针对传统的超声穿透式异侧检测法受换能器布置方式的影响且需要较高灵敏度的检测装置,对于厚度较大试件的检测信号幅值较低。提出了一种基于穿透式同侧检测模式(v透射法)的非接触空气耦合超声波无损检测技术应用于泡沫材料的检测中。首先简要阐述了空气耦合超声波v透射法检测模式的基本原理,其次介绍了利用v透射法对泡沫材料进行非接触空气耦合超声声速测量以及对其内部缺陷的检测,成功检出了传统超声波检测方法难以检测的泡沫材料缺陷并成像;最后使用空耦超声同侧v透射法点采集方式将探头沿着两个互相正交的方向对损伤进行同步线性扫查,得到缺陷区域幅值曲线并使用6 dB法对其定量结果表明使用空耦超声同侧v透射法定量精度较高,误差在20%以下,满足实际的检测精度。
In view of the fact that the traditional ultrasonic penetrating different-side detection method is affected by the arrangement of the transducer and requires a high-sensitivity detection device,the detection signal amplitude of the specimen with a larger thickness is lower.This article proposes a non-contact air-coupled ultrasonic non-destructive testing technology based on the penetrating ipsilateral detection mode(v transmission method)to be applied to the detection of foam materials.First,the basic principle of the air-coupled ultrasonic v-transmission method detection mode is briefly explained,and then the non-contact air-coupled ultrasonic sound velocity measurement of foam materials by the v-transmission method and the detection of its internal defects are introduced.The traditional ultrasonic detection method is successfully detected.Foam material defects that are difficult to be detected and imaged;finally,using air-coupled ultrasonic ipsilateral v transmission method point acquisition method,the probe is used to synchronously scan the damage along two mutually orthogonal directions to obtain the defect area amplitude curve and use 6 dB The quantitative results of the method show that the use of the air-coupled ultrasonic ipsilateral v transmission method has a higher quantitative accuracy,and the error is less than 20%,which meets the actual detection accuracy.
作者
常俊杰
罗文斌
陈志恒
钟海鹰
郑阳
CHANG Junjie;LUO Wenbin;CHEN Zhiheng;ZHONG Haiying;ZHENG Yang(Key Laboratory of Nondestructive Testing Technology,Ministry of Education,Nanchang Hangkong University,Nanchang Jiangxi 330063,China;Tsinghua Yangtze River Delta Research Institute,Jiaxing Zhejiang 314000,China;Nippon Probe Co.,LTD.,Yokohama 232-0033,Japan;China Special Equipment Inspection and Research Institute,Beijing 100029,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2020年第11期1655-1660,共6页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(11464030)
南昌航空大学研究生创新专项资金项目(YC2019050)。
关键词
泡沫材料
空气耦合超声
v透射法扫描成像
缺陷定量
foam material
air-coupled ultrasound
v transmission method scanning imaging
defect quantification
