A shearography nondestructive testing instrument for composite based on Wollaston prism
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摘要:
激光错位散斑干涉技术具有全场非接触、高精度和高灵敏度等优点,被广泛应用于复合材料的无损检测领域。针对实际工程应用中的复合材料缺陷检测,提出了一种结构紧凑、抗干扰能力强的基于沃拉斯顿棱镜的错位散斑干涉无损检测仪,实现了对缺陷的实时动态检测。使用该检测仪对不同类型复合材料中的缺陷进行检测,检出率可达97%,可检测的最小缺陷尺寸为ϕ2 mm。
Abstract:Shearography technique has the advantages of full-field noncontact, high precision and high sensitivity, and is widely used in the field of nondestructive detection of composites. For the practical engineering application of composite defect detection, a shearography nondestructive instrument based on a Wollaston prism with compact structure and strong anti-interference ability was proposed, so as to realize real-time dynamic defect detection. The system was used to teste the different types of composite materials. It achieved a detection rate of 97% and can detect defects as small as 2 mm.
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Keywords:
- shearography /
- composite /
- Wollaston prism /
- dynamic measurement
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Table 1 碳纤维层压复合板缺陷的检出率
缺陷形状 缺陷大小 缺陷深度 检出率 圆形 Φ 3 mm ≥1 mm 91% <1 mm 93% Φ 6 mm和Φ 10 mm ≥1 mm 95% <1 mm 97% 矩形 2 mm×10 mm 0.5 mm 92% 12 mm×6 mm 10 mm×2 mm 94% 4 mm×4 mm 
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