Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1988-11-23
1990-03-27
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Fluid material examination
73290R, 73DIG5, 164449, 324236, 32420716, 336208, G01F 2300, G01B 714, B22D 200
Patent
active
049124072
ABSTRACT:
An inductance coil serves as a displacement sensor arranged in connection with a tuned circuit of an oscillator. Liquid level displacement in an LEC crystal growth environment is sensed as a frequency change in the oscillator circuit as compared to a set point value. The sensor is protected from the environment by an outer protective sheath of non-conductive, non-contaminating material such as boron nitride.
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Gualtieri Devlin M.
Narasimban Mandayam C.
Porbansky Edward
Allied-Signal Inc.
Buff Ernest D.
Fuchs Gerhard H,.
Stewart Richard C.
Strecker Gerard R.
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