机载激光诊断材料的评估

J. Luke, David Thomas, Jay S. Lewis, C. Phipps
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引用次数: 1

摘要

AEgis技术集团和RTI国际公司正在开发用于高能激光(HEL)诊断应用的微传感器。共形传感器阵列将测量入射激光束的辐照度分布,以及伴随的目标表面温度上升。开放的网格结构允许90%的光束撞击表面。该项目的一个关键部分是开发一种保护涂层,以确保传感器在高辐照水平下的生存能力,使用寿命约为10秒。防护涂层必须向辐照度传感器传输可测量量的光。我们已经进行了实验来评估候选的隔热材料。在第一轮实验中,使用10kW的CO2激光器照射纯材料,包括金属和碳箔。虽然许多金属箔被激光穿孔,但没有大量的材料被烧蚀掉。事实上,大多数测试样品都增加了质量,可能是由于氧化。高速视频分析显示,一旦金属熔化,表面张力导致熔融金属在孔边缘周围凝聚成液滴。第二轮和第三轮测试使用3kW, 1.07μm光纤激光器进行,包括高反射金属和陶瓷样品,标准等离子喷涂涂层和多层堆叠。我们还测量了由先进印刷技术沉积的纳米颗粒溶液制成的温度传感器和辐照度传感器的性能,并完成了高温粘合剂的初步研究。
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Evaluation of materials for on-board laser diagnostics
The AEgis Technologies Group and RTI International are developing microsensors for High Energy Laser (HEL) diagnostic applications. The conformal sensor array will measure the irradiance profile of an incident laser beam, and concomitant rise in surface temperature of the target. The open mesh architecture allows 90% of the beam to impact the surface. A critical part of this program is developing a protective coating that ensures sensor survivability at high irradiance levels for operational lifetimes on the order of 10 seconds. The protective coating must transmit a measurable amount of light to the irradiance sensor. We have conducted experiments to evaluate candidate heat shield materials. In the first round of experiments, a 10kW CO2 laser was used to irradiate pure materials, including metals and carbon foils. Although many of the metal foils were perforated by the laser, no significant amount of material was ablated away. In fact, most of the test samples gained mass, presumably due to oxidation. Analysis of high speed video shows that once the metal melted, surface tension caused the molten metal to coalesce into droplets around the rim of the hole. The second and third rounds of testing, conducted with a 3kW, 1.07μm fiber laser, included samples of highly reflective metals and ceramics, standard plasma-sprayed coatings, and multilayer stacks. We have also measured the performance of temperature sensors and irradiance sensors fabricated from nanoparticle solutions deposited by advanced printing technology and have completed a preliminary investigation of high temperature adhesives.
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