Measuring Equipment For Testing The Directrix Of High-Resolution Wolter-Type Telescopes

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Abstract
The measuring equipment has been designed and constructed for testing the directrix of Wolter-type telescope mirrors. Due to the high accuracy required its design is based on the principles of industrial metrology and has been adapted to the specific problems encountered with the Wolter-type tlescope. Measurement is carried out by an inductive probe which, as a result of its low contact pressure, can also be used on polished surfaces. The meridian curve is compared with a test glass of optimum spherical surface so that deviations in the order of 1/100 Tim can be detected. A digital scale is used to localize the contact points measured in mirror axis direction. In the final version, the two measured values obtained are fed into a calculator for nominal/actual comparision. The differences obtained between directrix and test glass are compared with the nominal values already stored in the calculator and the resulting deviations then recorded on an analog recorder.

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