Transducer using spin resonant material

Claim 1

A RECORDING TRANSDUCER FOR RADIO BEAMS IN THE MICROWAVE BAND OF FREQUENCIES COMPRISING: A MICROWAVE CAVITY FOR RECEIVING THE RADIO BEAM AND PROVIDING A STANDING WAVE PATTERN THEREIN, A FREQUENCY SENSITIVE SPIN RESONANT MATERIAL THAT IS ABSORPTIVE OF RADIO FREQUENCY ENERGY IN THE MICROWAVE BAND BEING SUPPORTED WITHIN THE CAVITY AT A LOCATION HAVING A MINIMUM AMPLITUDE OF THE ELECTRIC FIELD VECTOR AND A MAXIMUM AMPLITUDE OF THE MAGNETIC FIELD VECTOR OF THE STANDING WAVE, MAGNET MEANS FOR APPLYING A LOW FREQUENCY MAGNETIC FIELD TO THE SPIN RESONANT MATERIAL TO TUNE THE MATERIAL INTO FREQUENCY SENSITIVITY WITH THE RADIO BEAM, SAID CAVITY BEING PROVIDED WITH OPENINGS IN ASSOCIATED ALIGNMENT WITH THE SPIN RESONANT MATERIAL TO RECEIVE AN ELONGATED RECORDING TAPE WHICH IS INTRODUCED INTO AND WITHDRAWN FROM THE MICROWAVE CAVITY, AND SAID CAVITY INCLUDING MEANS FOR GUIDING THE TAPE INTO HEAT TRANSFER RELATIONSHIP WITH THE SPIN RESONANT MATERIAL, WHEREBY THE RECORDING TAPE IS INTRODUCED AND EXCITED THROUGH SAID OPENINGS AND IS DISPOSED IN ENERGY TRANSFERRING RELATIONSHIP WITH THE SPIN RESONANT MATERIAL WITHIN THE CAVITY TO RECEIVE HEAT IMAGES THEREFORM.