Displacement detector

Claim 1

A MICROWAVE GAGE FOR DETECTING OBJECT DISPLACEMENT FROM A REFERENCE POSITION COMPRISING A STABLE MICROWAVE FREQUENCY SOURCE, ANTENNA MEANS, LINEAR MICROWAVE PHASE COMPARATOR MEANS HAVING FIRST AND SECOND INPUTS AND AN OUTPUT, FIRST DIRECTIONAL COUPLING MEANS CONNECTING SAID MICROWAVE FREQUENCY SOURCE TO THE FIRST INPUT OF SAID COMPARATOR MEANS FOR PROVIDING A REFERENCE SIGNAL TO SAID COMPARATOR MEANS, SECOND DIRECTIONAL COUPLING MEANS COUPLING SAID SOURCE TO SAID ANTENNA MEANS AND COUPLING THE SIGNAL REFLECTED BY THE OBJECT RECEIVE BY THE ANTENNA MEANS TO THE SECOND INPUT OF SAID COMPARATOR MEANS, VARIABLE MICROWAVE ATTENUATOR MEANS IN THE CONNECTION BETWEEN SAID FIRST COUPLING MEANS AND SAID COMPARATOR MEANS FOR CONTROLLING THE MAGNITUDE OF SAID REFERENCE SIGNAL, THE OUTPUT OF SAID LINEAR PHASE COMPARATOR MEANS PROVIDING A SIGNAL THE AMPLITUDE OF WHICH IS PROPORTIONAL TO THE RELATIVE PHASE DIFFERENCE BETWEEN THE SIGNALS APPLIED TO SAID INPUTS OF SAID LINEAR PHASE COMPARATOR MEANS AND HENCE IS PROPORTIONAL TO OBJECT DISPLACEMENT AND THE POLARITY OF WHICH INDICATES THE DIRECTION OF OBJECT DISPLACEMENT FROM SAID REFERENCE POSITION, SO THAT THE OBJECT DISPLACEMENT IN ONE DIRECTION MAY BE INDICATED AS POSITIVE AND OBJECT DISPLACEMENT IN THE OPPOSITE DIRECTION MAY BE INDICATED AS NEGATIVE, CALIBRATION MEANS TO ADJUST THE PHASE OF THE REFERENCE SIGNAL RELATIVE THE PHASE OF THE REFLECTED SIGNAL SO THAT THE AMPLITUDE OF THE SIGNAL AT THE OUTPUT OF SAID MICROWAVE PHASE COMPARATOR MEANS IS A PREDETERMINED VALUE WHEN THE OBJECT IS AT THE REFERENCE POSITION.