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1 September 1991 Control of thermally induced porosity for the fabrication of beryllium optics
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Abstract
In this study we have examined the polishability of bare beryllium as it relates to processing for the fabrication of a mirror substrate. Our work has shown that annealing treatments can produce microporosity in the beryllium by a mechanism known as Thermally Induced Porosity (TIP). When the porous material is polished, the achievable scatter is degraded. TIP response is sensitive to the processing history of the material and the effect can vary from minimal to substantial. We have also demonstrated a scatter screening test which can indicate the sensitivity of a given lot of material to TIP.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harry A. Moreen "Control of thermally induced porosity for the fabrication of beryllium optics", Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); https://doi.org/10.1117/12.46523
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