Improved Ω-Scan for separate measurement of true AT-cutting angles and X-miscutting angles for round quartz blanks

The improved Ω-Scan is a new method for measuring the AT-cutting angle of round quartz blanks uninfluenced by an X-tilt. From this true AT-cutting angle the frequency/temperature curve of the quartz oscillator can be calculated. This method combines all positive properties of the known Ω-Scan with the possibility to select even strongly miscutted blanks correctly. To get more information about the cutting orientation of a quartz blank than the simple Ω-Scan was able to obtain, four-instead of two-reflections at two different lattice planes-instead of one-are measured. From the position of these four reflections the true AT-cutting angle and the X-tilt can be determined separately