Position detecting transducer

Abstract

Abstract POSITION DETECTING TRANSDUCER FOR MEASURING ACCELERATION HAVING A CONDUCING PLANAR ELEMENT AND MEANS FOR MOUNTING SAID PLANAR ELEMENT FOR ANGULAR MOVEMENT. A MAGNET IS PROVIDED AND A COIL IS DISPOSE IN THE MAGNETIC FIELD OF SAID MAGNET AND IS SECURED TO SAID PLANAR ELEMENT FOR ANGULAR MOVEMENT WITH SAID CONDUCTING PLANAR ELEMENT. AN INDUCTIBE PICKOFF ELEMENT CONSISTING OF A PAIR OF COAXIAL WINDINGS IS PROVIDED WITH THE WIND INGS LYING IN A PLANE SUBSTANTIALLY PARALLEL TO THE PLANE OF THE CONDUCTING ELEMENT AND ON ONE SIDE OF THE CONDUCTING ELEMENT. MEANS IS PROVIDED FOR APPLYING EXCITATION TO THE PICKOFF TO ESTABLISH A MAGNETIC FIELD WITH THE CONDUCTING ELEMENT BEING POSITIONED RELATIVELY CLOSE TO THE PICKOFF ELEMENT SO THAT THE COUPLING BETWEEN THE WINDINGS IS DISTURBED AND LOSSES ARE REFLECTED INTO THE WINDINGS BY THE CONDUCTING ELEMENT. DETECTOR MEANS IS CONNECTED TO SAID MEANS FOR SUPPLYING EXCITATION TO THE PICKOFF ELEMENT TO GIVE AN INDICATION OF THE POSITION OF THE CONDUCTING ELEMENT RELATIVE TO THE PICKOFF. FEEDBACK MEANS IS COUPLED TO SAID DETECTOR MEANS FOR APPLYING A CURRENT TO SAID COIL PROPORTIONAL TO THE DISPLACEMENT OF THE CONDUCTING PLANA ELEMENT. THE MEANS FOR APPLYING EXCITATION TO THE INDUCTIVE PICKOFF ELEMENT CONSISTS OF AN OSCILLATOR THE PICKOFF ELEMENT TO ESTABLISH A MAGNETIC FIELD WITH THE CLUDES A TANK CIRCUIT AND FEEDBACK CIRCUIT. ONE OF THE WINDINGS OF THE INDUCTIVE PICKOFF ELEMENTS IS CONNECTED INTO THE TANK CIRCUIT OF THE OSCILLATOR TO FORM A PART OF THE TANK CIRCUIT AND THE OTHER OF THE WINDINGS IS CONNECTED INTO THE FEEDBACK CIRCUIT OF THE OSCILLATOR. THE OUTPUT OF THE OSCILLATOR IS MODULED BY VARIATIONS IN SPACING BETWEEN THE CONDUCTING ELEMENT AND THE INDUCTIVE PICKOFF ELEMENT. ADDITIONAL FEDBACK MEANS COUPLES THE DETECTOR MEANS TO THE OSCILLATOR TO CHANGE THE GAIN OF THE OSCILLATOR TO THEREBY CONTROL THE LOOP GAIN AND THE FREQUENCY RESPONSE OF THE TRANSDUCER.

Inventors

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