SBIR Phase II: Real-Time Magneto-Optic Nondestructive Inspection of Tagged Composite Materials

该小型企业创新研究第二阶段项目将进一步开发第一阶段首次探索的复合材料无损检测技术（NDI）。复合材料是许多传统金属结构部件的坚固、轻质替代品。 然而，由于复合材料的高电导率和/或高超声衰减，通常难以检查不连续性。 在第一阶段，物理研究公司。(PRi)证明了使用真实的时间磁光/涡流成像（MOI）技术（由PRi开发）来形成“标记”复合材料中的缺陷图像的基本可行性。 在制造过程中用微量磁性颗粒标记的复合材料，或用导电金属丝网构造的复合材料，成功地检查了纤维编织中的空隙、裂纹、冲击损伤和不连续性。 第二阶段研究的主要目标是：1）开发一种专门适用于复合材料应用的MOI系统（例如，改进的磁光传感器、机载磁化装置）2）与复合材料制造商合作，开发符合行业需求的标记技术3）完成旨在阐明基本原理的研究。 第二阶段研究将包括受控实验（和计算），旨在确定特定类型缺陷的最佳标记类型，所需标记的最小量以及这种标记对复合材料物理性能的影响。 Pri预计第二阶段的研究将取得成功，并将产生一个能够检测各种复合材料的MOI系统。 军用和民用航空航天部门都将受益于这种新的NDI方法。 在制造过程中用磁性颗粒（或金属丝网）标记复合材料将导致用于复合材料的基于MOI的NDI的简单、低成本、快速的方法。 这种在制造过程中以及随后的使用或维修过程中对复合材料进行NDI的新能力将提高MOI的销售。

This Small Business Innovation Research Phase II project will further develop a nondestructive inspection technique (NDI) for composites first explored in Phase 1. Composite materials are strong, lightweight substitutes for many traditional metallic structural components. However, composites are often difficult to inspect for discontinuities due to their high electrical resistively and/or high ultrasonic attenuation. In Phase I, Physical Research Inc. (PRi) demonstrated the basic feasibility of using real time magneto-optic/eddy current imaging (MOI) techniques (developed by PRi) to form images of defects in `tagged` composites. Composites tagged during manufacturing with trace quantities of magnetic particles, or constructed with electrically conducting wire screens, were successfully inspected for voids, cracks, impact damage and discontinuities in fiber weave. The principal objectives of the Phase II research are to 1) Develop an MOI system that is specially adapted to applications in composites (e.g., improved magneto-optic sensors, on-board magnetizing devices) 2) Work with manufacturers of composite materials to develop tagging techniques that are compatible with industry needs 3) Complete studies designed to elucidate basic principles. The Phase II research will consist of controlled experiments (and calculations) designed to determine the optimum kinds of tagging for a particular type of defect, the minimum amount of tagging required and the effect this tagging has on the physical properties of composites. Pri anticipates that the Phase II research will be successful and that an MOI system capable of inspecting a wide range of composite materials will be the outcome. Both the military and civilian aerospace sectors will benefit from this new NDI method. Tagging composites with magnetic particles (or wire screens) during manufacturing will result in a simple, low cost, rapid method for MOI-based NDI of composites. This new capability for NDI of composites during manufacture and later in-service or during repairs, will lead to enhanced sales of the MOI.