Electricity: measuring and testing – Magnetic – With temperature control of material or element of test circuit
Patent
1990-07-09
1991-11-19
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
With temperature control of material or element of test circuit
324202, G01R 3500, G01R 3300, G01N 2772
Patent
active
050669125
ABSTRACT:
A non-contact level measurement system for monitoring distances with very high accuracy between a sensor coil and a metallic object such as a molten liquid level over either very narrow or extended distances. Controllers coupler with heaters, thermocouples, coolant air are provided for maintaining the sensor coil at a operating temperatures within the range of 400.degree. F. and 1200.degree. F. to eliminate variations to the operation of the sensor coil. The system incorporates an L-C resonant circuit connected between the output of an oscillator and the input of an operational amplifier. A variable inductor parallel with the capacitor of the L-C resonant circuit is used to obtain a precise offset operating frequency of the resonant circuit from the frequency of the oscillator.
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Edmonds W. S.
Poff Clifford A.
Wieder Kenneth A.
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