Automatic control of crystal growth

Details Automatic control of crystal growth Automatic control of crystal growth

1976-12-01

1981-03-24

Bernstein, Hiram

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

Control element responds proportionally to a variable signal...

156601, 422249, C30B 1528

Patent

active

042580030

ABSTRACT:
In crystal growing apparatus in which a crystal is vertically pulled from an electric heated melt the weight of the crystal is measured by a load cell whose output is compared with an expected function to form a control loop for controlling heater power, the improvement comprises a correction circuit for applying to the control loop a signal compensating for a time differential (.lambda.a) of an error signal in the load cell output. The correction circuit may be a feedback or a feed forward loop.

REFERENCES:
patent: 2908004 (1959-10-01), Levinson
patent: 3621213 (1971-11-01), Jen
patent: 3822111 (1974-07-01), Suzuki
patent: 3922527 (1975-11-01), Witkin
patent: 3934983 (1976-01-01), Bardsley
Bardsley et al., J. of Cryst. Growth, 24/25, (Mar. 1974), pp. 369-373.
Bardsley et al., J. of Cryst. Growth, 16, 1972, pp. 277-279.

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