Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing

SPIE LASE Pub Date : 2016-04-06 DOI:10.1117/12.2219866
Anthony J. Manzo, S. Kenderian, H. Helvajian
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引用次数: 7

Abstract

The change in properties of a propagating ultrasonic wave has been a mainstay characterization tool of the nondestructive evaluation (NDE) industry for identifying subsurface defects (e.g. damage). A variant of this concept could be applicable to 3D additive manufacturing where the existence of defects (e.g. pores) within a sub-layer could mark a product as non-qualifying. We have been exploring the utility of pulsed laser ultrasonic excitation coupled with CW laser heterodyne detection as an all optical scheme for characterizing sub surface layer properties. The all-optical approach permits a straight forward integration into a laser additive processing tool. To test the concept, we have developed an experimental system that generates pulsed ultrasonic waves (the probe) with high bandwidth (<<10MHz) and a surface displacement sensor that can capture the ultrasonic "return" signal with bandwidth close to 300 MHz. The use of high frequencies enables the detection of smaller defect sites. The technique is time resolved with the sensor and probe as point (>>30-200 microns) beams. Current tests include characterizing properties of spot weld joints between two thin stainless steel plates. The long term objective is to transition the technique into a laser additive manufacturing tool.
激光超声无损评价技术在增材制造中的应用
超声波传播特性的变化已经成为无损评估(NDE)行业用于识别地下缺陷(例如损伤)的主要表征工具。这一概念的一个变体可以适用于3D增材制造,其中子层中存在缺陷(例如孔隙)可以将产品标记为不合格。我们一直在探索脉冲激光超声激励与连续波激光外差检测相结合作为表征亚表面层性质的全光方案的实用性。全光学方法允许直接集成到激光增材加工工具中。为了测试这个概念,我们开发了一个实验系统,可以产生高带宽(>30-200微米)光束的脉冲超声波(探针)。目前的测试包括两块薄不锈钢板之间的点焊接头的特性。长期目标是将该技术转化为激光增材制造工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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