Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Position determining
Patent
1985-09-20
1987-02-17
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Position determining
377 39, 307265, G01M 300
Patent
active
046445706
ABSTRACT:
There is disclosed a digital enhancement circuit which responds to the complementary inductance provided by a planar coil sensor which inductance varies in a complementary manner according to the position of a movable member associated with the planar coil configuration. The complementary inductance is coupled to an oscillator whereby the period of the oscillator is varied in a first mode according to a first inductance value and in a second mode according to a second inductance value. These signals are then processed by means of digital processing circuitry to develop a signal indicative of the difference of the periods as divided by the sum of the periods. This signal is a ratiometric signal, and by employing digital counters, one can provide an output signal having a predetermined gain factor and having the above noted ratiometric characteristic which signal is indicative of the position of the movable member as further enhanced by the gain factor.
REFERENCES:
patent: 4336512 (1982-06-01), de Vries
Brosh Amnon
Landmann Wolf S.
Bitronics Inc.
Heyman John S.
Ohralik K.
Plevy Arthur L.
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