摘要
介绍了声激励激光错位散斑检测原理,对于厚度为30mm的喷涂绝热泡沫平板试样,声激励音频范围为1 0004 000Hz,采用相反时间平均错位散斑检测方法,能检测出30mm的方形脱黏缺陷。结合工程实践,结果表明,激光错位散斑检测技术适用于绝热泡沫脱黏缺陷的检测。
The principle of laser shearography with acoustic excitation was presented in this paper.For the 30 mm thickness sprayed on foam insulation test panel,using phase-reversal time-averaged shearography with acoustic excitation was used the multiple-frequency sweep ranging from 1 kHz to 4 kHz,following that a 30 mm square defect was detected.Combined with practical experience,experimental results show that laser shearography is a effective NDT method,suiting for debond defects detection in sprayed on foam insulation.
作者
程茶园
林鑫
葛丽
刘哲军
伍颂
CHENG Chayuan;LIN Xin;GE Li;LIU Zhejun;WU Song(Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China)
出处
《无损检测》
2020年第9期74-76,共3页
Nondestructive Testing
关键词
绝热泡沫
错位散斑
无损检测
insulation foam
shearography
nondestructive testing
