摘要
阐述了脉冲涡流无损检测系统的基本原理和组成。介绍了利用圆柱形线圈作为传感器进行金属导体表面裂纹的无损检测系统的激励源、信号放大及A／D转换部分。经实验表明：采用激励频率为1000Hz，占空比45％．55％时的测试效果最佳；激励电压采用7．5V，信号总放大倍数为1000得到的信号最适合PCI1712进行数据采集；缺陷深度与涡流的峰值电流相对应。
The theory and makeup of the pulsed eddy-current（PEC） nondestructive testing （NDT）system,which is included the excitation source, signal magnifying and A/D transformation, is presented. The surface crack on the metal tested by using the cylinder inductance sensor is introduced. When the excitation frequency is 1 000 Hz and time-empty ratio is 45 % -55 % ,the experiment test results are optimum,as well as for PCI1712 data collections when the excitation voltage is 7.5 V and signal amplifier multiple is 1000. The crack depths is corresponding to the eddy-current scope.
出处
《传感器与微系统》
CSCD
北大核心
2007年第8期76-78,共3页
Transducer and Microsystem Technologies
基金
四川省重点科技攻关计划资助项目(04GG006-022-3)
关键词
脉冲涡流
无损检测
圆柱形线圈
激励源
信号检测和A/D转换
pulsed eddy-current
nondestructive testing
cylinder inductance sensor
excitation source
signal magnifying and A/D transformation
