Automatic phase shift correcting circuit for feedback magnetic resonance device

Claim 1

A CIRCUIT FOR AUTOMATICALLY COMPENSATING FOR CHANGES IN THE PHASE SHIFT IN THE FEEDBACK SIGNAL PATH OF A TWO SAMPLE FEEDBACK MAGNETIC RESONANCE DEVICE EMPLOYING DIFFERENT FEEDBACK LOOPS FOR EACH OF THE LARMOR FREQUENCIES SUPPLIED BY THE TWO SAMPLES COMPRISING, MEANS PROVIDING AN OUTPUT FOR VARYING THE TRANSVERSE RELAXATION TIME CONSTANT OF THE PRECESSING NUCLEAR PARTICLES OF BOTH SAMPLES WITHIN THE MAGNETIC RESONANCE DEVICE TO CAUSE A MODULATION OF THE LARMOR FREQUENCY OUTPUT ASSOCIATED WITH EACH OF SAID SAMPLES WHENEVER PHASE SHIFT AT THE PARTICULAR LARMOR FRQUENCY IS PRESENT IN THE FEEDBACK SIGNAL PATHS OF THE DEVICE, EACH OF SAID FEEDBACK LOOPS INCLUDING, FILTER MEANS FOR RESTRICTING THE LOOP TO ONE OF THE MODULATED LARMOR FREQUENCIES ONLY AND ADJUSTABLE DELAY MEANS FOR CONTROLLING THE TOTAL DELAY IN THE FEEDBACK LOOP, A FIRST DEMODULATOR RESPONSIVE TO THE FILTERED MODULATED LARMOR FREQUENCY IN ONE FEEDBACK LOOP FOR DEMODULATING ONE LARMOR FREQUENCY AND PASSING THE MODULATING SIGNAL, A FIRST PHASE COMPARATOR RESPONSIVE TO THE OUTPUT OF THE FIRST DEMODULATOR AND THE SAID VARYING OUTPUT FOR PROVIDING A FIRST ERROR SIGNAL CORRESPONDING TO THE RELATIVE MAGNITUDE AND SENSE OF THE TWO SIGNALS, FIRST CONTROL MEANS RESPONSIVE TO THE FIRST ERROR SIGNAL FOR ADJUSTING THE DELAY MEANS IN THE SAID ONE FEEDBACK LOOP IN ACCORDANCE WITH THE SAID FIRST ERROR SIG-