Frequency-compensated access structure for cavity resonator

Claim 1

A MICROWAVE APPARATUS COMPRISING, IN COMBINATION: (A) A MICROWAVE CAVITY ASSEMBLY COMPRISING A CAVITY RESONATOR, AT LEAST THREE WALLS OF WHICH ARE APERTURED THERETHROUGH, AND SAMPLE ACCESS MEANS FORMING A HOLLOW INTERIOR CHAMBER HAVING A CUT-OFF FREQUENCY BEYOND THE FREQUENCY OF SAID RESONATOR, SAID SAMPLE ACCESS MEANS EXTENDING THROUGH TWO OPPOSITELY-DISPOSES APERTURED WALLS OF SAID RESONATOR AND BEING ADAPTED TO SUPPORT A SAMPLE CELL WITHIN SAID RESONATOR, AND SAID SAMPLE CELL BEING ADAPTED TO CONTAIN A MICROWAE RESONANT SAMPLE THEREIN, (B) AT LEAST ONE FREQUENCY-SHIFT-COMPENSATED ADAPTOR ASSEMBLY COMPRISING: (1) A SHORT HOLLOW WAVEGUIDE SECTION FORMING A HOLLOW CHAMBER HAVING A CUT-OFF FREQUENCY BEYOND THE RESONANT FREQUENCY OF SAID CAVITY RESONATOR, FOR PROVIDING ACCESS TO THE INTERIOR OF SAID RESONATOR THROUGH A WALL ADJACENT SAID OPPOSITELY DISPOSED WALLS WHILE PRODUCING TOTAL ATTENUATION OF INTERIOR MICROWAVE FIELDS EXTENDING FROM SAID RESONATOR INTO SAID WAVEGUIDE SECTION, AND (2) AN END-CLOSING ADAPTOR MEANS COMPRISING A SOLID MEMBER HAVING A CENTRAL PORTION PROJECTING AXIALLY INTO SAID RESONATOR AND APERTURED THERETHROUGH, THE PROJECTING PORTION OF SAID MEMBER BEING PRODUCTIVE OF A DECREASE IN THE MICROWAVE LENGTH OF SAID CAVITY AND A CORRESPONDING INCREASE IN THE RESONANT FREQUENCY OF SAID CAVITY, SAID DECREASE IN MICROWAVE LENGTH AND SAID INCREASE IN FREQUENCY BEING EQUAL AND OPPOSITE RESPECTIVELY TO THE INCREASE IN SAID MICROWAVE LENGTH AND THE CORRESPONDING DECREASE IN SAID FREQUENCY DUE TO FRINGING EFFECTS OF SAID INTERIOR MICROWAVE ABOUT SAID APERTURE, (C) A CAVITY COUPLING SECTION BEING ATTACHED AT ONE END OF SAID CAVITY RESONATOR OPPOSITE SAID ADAPTOR ASSEMBLY, (D) A WAVEGUIDE ASSEMBLY ADAPTED FOR TRANSMISSION OF MICOWAVE ENERGY COUPLED TO SAID RESONATOR, (E) AT LEAST ONE LIGHT SOURCE DISPOSED IN COAXIAL ALIGNMENT WITH THE INTERIOR LONGITUDINAL AXIS OF SAID SHORT WAVEGUIDE SECTION AND ADAPTED FOR ENERGIZATION BY EXTERNAL POWER SUPPLY MEANS, FOR TRANSMITTING LIGHT THROUGH SAID WAVEGUIDE SECTION INTO SAID RESONATOR WHEREBY SAID MICROWAVE RESONANT SAMPLE MAY BE IRRADIATED THEREIN.