Abstract
Based on a known theory, a linear digital filter has been developed in order to estimate the crystal radius from the measured weight error signal during Czochralski growth of GGG crystals. We investigated the effect of the filtering on weight error data measured duting GGG growth. The dynamic responses of radius error and measured weight error have been characterized by using estimates of the transfer functions relating heating power to crucible weight and crystal radius error. The results show that the dynamic response of the uncompensated signal of a balance weighing the crucible during growth is much faster than the response of the crystal radius. In the frequency regime of our test signals, the uncompensated weight variations can be considered as a noisy version of the radius error, rather than a real weight variation of the unsolidified charge.
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