During the outer surface fabrication phase of the Advanced X-Ray Astrophysical Facility, (AXAF), optics fabrication program, ultrasonic thickness gaging was used to achieve submicrometer measurements of material removal. AXAF will collect grazing-incidence X-rays. The eight optics are all slightly tapered Zerodur cylinders ranging in diameter from 6 to 1.2 m, with thicknesses varying from about 15 to 22.5 mm. All had an initial length of 1 meter. The inner surfaces of the mirrors are the optical surfaces of the system.
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