航天泡沫材料的声激励激光错位散斑检测  

Acoustic excitated laser shearography testing of aerospace foam materials

作　　者：程茶园[1] 林鑫[1] 葛丽[1] 刘哲军[1] 伍颂[1] CHENG Chayuan;LIN Xin;GE Li;LIU Zhejun;WU Song(Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China)

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《无损检测》2020年第9期74-76,共3页Nondestructive Testing

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.

关 键 词：绝热泡沫 错位散斑 无损检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]