Acoustic excitated laser shearography testing of aerospace foam materials
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摘要: 介绍了声激励激光错位散斑检测原理,对于厚度为30 mm的喷涂绝热泡沫平板试样,声激励音频范围为1 000~4 000 Hz,采用相反时间平均错位散斑检测方法,能检测出30 mm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。Abstract: 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.
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Keywords:
- insulation foam /
- shearography /
- nondestructive testing
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