Blanks - the thin quartz plates industrially used for oscillators, nowadays produced at rates of millions per week - need thorough controls of their properties. The most important of them, the correct orientation of the plates’ surface relative to certain lattice planes or crystal axes, can be determined in a few seconds measuring time with an accuracy of a few arcseconds using the so-called “Ω Scan“. This method and its further development in the last time will be described in some detail.

Keywords: quartz plates, sorting

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