Position transducer with temperature dependency compensation hav

Details Position transducer with temperature dependency compensation hav Position transducer with temperature dependency compensation hav

1988-09-23

1991-03-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420716, 336 45, 336136, G01B 714, H01E 2106

Patent

active

050032585

ABSTRACT:
The transducer comprises only a simple coil in which a core normally connected to a device the position of which is to be measured is displaced axially. The core comprises a rod of ferromagnetic material surrounded by a tube of good electrical conductivity but of small magnetic permeability. The coil is supplied by an alternating current producing eddy currents in the tube. The drop of sensitivity due to the increase of the resistivity of the tube with the increase of the temperature is compensated by the increase of the sensitivity due to the increase of the permeability of the rod with the increase of the temperature. The transducer is of light weight and of small dimensions and it is compensated in temperature in the temperature range comprised between -40.degree. C. and +20.degree. C.

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patent: 4857824 (1989-08-01), Tew
Roberts, Howard C., Electric Gaging Methods for Strain, Movement, Pressure and Vibration, Instruments, vol. 17, Jun. 1944, pp. 334-339.

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