Position measuring device having a sensor for sensing the distan

Details Position measuring device having a sensor for sensing the distan Position measuring device having a sensor for sensing the distan

1994-05-27

1997-05-06

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

324252, 32420712, G01B 714, G01B 730, G01R 3309

Patent

active

056274661

ABSTRACT:
A position measuring device having a sensor, the output signal Sd of which is a function of the distance between a graduation and a scanning unit. To render the distance-dependent signal independent of temperature changes, the sensor consists of a potentiometer circuit with an active branch and a complementary branch. Magneto-resistive elements which scan the graduation are disposed in the active branch. Resistive elements are disposed in the complementary branch which have the same temperature behavior as the magneto-resistive elements of the active branch, but are substantially insensitive to magnetic fields. The voltage across the active branch is taken as the distance-dependent measuring signal Sd and is used to control the amplitude of the position-dependent scanning signals generated by scanning the graduation.

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