摘要
声发射检测技术作为大型常压储罐底板的在线检测技术,其检测结果受传感器布置高度、频率范围、背景噪声高低、定位声速设定等诸多因素的影响。针对两种不同高度的传感器布置方式,通过断铅标定和现场检测分析传感器布置高度对声发射检测结果的影响,结果表明:传感器布置高度为300mm和600mm时,实测结果未见明显异常,其误差满足工程检测的要求;将传感器布置在高处的方式容易采集衰减程度小的信号,有利于长距离检测,而将传感器布置在低处的方式更易采集衰减程度明显的信号。
Acoustic emission technology is a recognized method for large scale atmospheric tank bottom online detection,whose results are affected by many factors,such as the height of sensors,the frequency range of the sensor,the background noise and the sound velocity,etc.In this paper,according to two different arrangements with sensor height,respectively,the influence of the height of sensors on AE detection is analyzed by the brokenlead test and corrosion detection.The results show that there is no obvious difference between results of 300 mm and600 mm,the error meets engineering requirements.The higher sensor strategy makes it easier to collect the signal with little attenuation which helps the long distance detection.Conversely,the lower strategy is good for the collection of the signal with obvious attenuation.
作者
闫河
YAN He(China Special Equipment Inspection and Research Institute,Beijing 100029,China)
出处
《无损检测》
2018年第7期19-21,68,共4页
Nondestructive Testing
基金
国家质量监督检验检疫总局科技计划资助项目(2016QK204)
关键词
声发射检测
常压储罐
断铅标定
布置高度
信号衰减
acoustic emission inspection
atmospheric storage tank
broken-lead calibration
arrange height
signal attenuation