3 May 2017 High-temperature material characterization for multispectral window
Author Affiliations +
A microwave cylindrical cavity combined with a laser has been investigated to characterize the temperature dependence of widow materials in the Air Force Research Laboratory (AFRL). This paper discusses the requirements of high temperature RF material characterizations for transparent ceramic materials, such as ALON, that can potentially be used for multispectral windows. The RF cylindrical resonator was designed and the numerical model was studied to characterize the dielectric constant of materials. The dielectric constant can be extracted from the resonant frequency shift based on the cavity perturbation method (CPM), which is sensitive to the sample size and shape. Laser heating was applied to the material under test (MUT), which could easily be heated above 1000°C by the laser irradiation, in order to conduct CPM at high temperature. The temperature distribution in a material was also analyzed to investigate the impact of the thermal properties and the sample shape.
Conference Presentation
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James Park, James Park, Marvin-Ray Arida, Marvin-Ray Arida, Zahyun Ku, Zahyun Ku, Woo-Yong Jang, Woo-Yong Jang, Augustine M. Urbas, Augustine M. Urbas, } "High-temperature material characterization for multispectral window", Proc. SPIE 10179, Window and Dome Technologies and Materials XV, 101790E (3 May 2017); doi: 10.1117/12.2262755; https://doi.org/10.1117/12.2262755

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