Induktiver Näherungssensor

The distance between sensing coil L1 and object is measured by the pulse width proportional to the phase-shift Ph1 between the coil current and voltage. An analogue comparator K1 measures the coil voltage relative to a reference dc voltage and switches a logic gate when the coil voltage becomes larg...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	BECKER, WOLF-JUERGEN, DR., 34119 KASSEL, DE, WENDT, THOMAS., 34117 KASSEL, DE
Format:	Patent
Sprache:	ger
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS BASIC ELECTRONIC CIRCUITRY ELECTRICITY INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS PULSE TECHNIQUE TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	The distance between sensing coil L1 and object is measured by the pulse width proportional to the phase-shift Ph1 between the coil current and voltage. An analogue comparator K1 measures the coil voltage relative to a reference dc voltage and switches a logic gate when the coil voltage becomes larger or smaller than the reference. A second comparator K2 measures the voltage across a reference impedance Zref relative to a second dc voltage and switches a gate. The output from K1 and the inverted K2 output are fed into a logic gate which generates a pulse sequence F of pulse width proportional to the phase-shift at the oscillator frequency. A Schmitt trigger can be added to introduce hysteresis in the switch point.