Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-05-29
1992-06-02
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324686, 324690, G01P 3483, G01R 2726
Patent
active
051190362
ABSTRACT:
An electrical capacitance clearanceometer system adapted clearanceometer system to measure the distance between a housing and a moving member within and closely adjacent the housing as a function of electrical capacitance therebetween, utilizes a high temperature probe which contains a high temperature electrical inductor potted in one end and an electrical capacitor electrode in a braze sealed tip at the other end and electrically connected to the inductor. The probe is inserted in a housing to have its capacitor electrode positioned adjacent the moving member. The electrode is braze attached to a ceramic insulator at the end of the probe and the ceramic insulator is brazed to a transition metal sleeve which is then brazed to the probe to fix the insulator in the probe. An air passage is formed between the insulator and the probe body to provide cooling air to the insulator and capacitor electrode. A voltage controlled, continuously variable, high frequency oscillator and a phase detector are connected to the probe to provide an electrical signal proportional to the capacitance and distance between the probe capacitor electrode and the moving member.
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Electronics, p. 147, May 1953.
Hester Norbert J.
Hornbeck Charles E.
Rickards Charles
General Electric Company
Shay Bernard E.
Squillaro Jerome C.
Wieder Kenneth A.
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