Electricity: measuring and testing – Magnetic – Displacement
Patent
1989-03-27
1989-09-05
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
324225, 34087036, G01B 702, G01N 2772
Patent
active
048642320
ABSTRACT:
A temperature compensation structure for a displacement transducer of the type having a coil and an electrically conducting, non-ferromagnetic wall moving in telescoping relationship with the coil and excited by a signal at a sufficiently high frequency so that skin effect in the wall permits wall displacement to vary the reluctance of the coil flux path and thereby vary its inductance proportionally to displacement. The improvement provides temperature compensation for and essentially eliminates variation in the electrical scale factor which is caused by change in the temperature of the transducer. The improvement is to interpose between the coil and the core of the transducer a wall which has a thickness which is small compared to the skin depth of the wall material at the operating frequency of the device. This wall operates as a reluctance which varies as a function of temperature to vary the flux intensity in the coil as a function of temperature in a manner to negate variations in transducer output voltage as a function of temperature.
REFERENCES:
patent: 3210746 (1965-10-01), Clapp
patent: 4502006 (1985-02-01), Goodwin et al.
patent: 4543732 (1985-10-01), Maples
Eisenzopf Reinhard J.
Foster Frank H.
Harvey Jack B.
Sunpower, Inc.
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