Temperature measuring apparatus

Claim 1

A DEVICE FOR MEASURING TEMPERATURES WITHIN THE CORE OF NUCLEAR REACTOR WHICH COMPRISES AN ELONGATED ENCLOSURE ADAPTED TO BE POSITIONED WITHIN THE CORE OF THE REACTOR, SAID ENCLOSURE DEFINING A GENERALLY CYLINDRICAL CAVITY COMMUNICATING WITH AN OPEN END PORTION THEREOF, AN ELONGATED COUPLING TUBE HAVING ONE EXTREMEITY THEREOF CONNECTED TO THE OPEN END PORTION OF SAID ENCLOSURE, SAID COUPLING TUBE BEING OF SUFFICIENT LENGTH TO EXTEND OUTWARDLY FROM THE CORE OF A REACTOR WHEREIN THE TEMPERATURE MEASURING DEVICE IS EMPLOYED, AN ELECTROACOUSTIC TRANSDUCER SECURED IN GAS-TIGHT RELATION TO THE OTHER LONGITUDINAL EXTREMITY OF SAID COUPLING TUBE, MEANS SELECTIVELY RENDERING SAID TRANSDUCER EFFECTIVE TO TRANSMIT INTERMITTENT SIGNALS OF VARYING FREQUENCY AND CONTROLLED DURATION THROUGH SAID COUPLING TUBE TO SAID CYLINDRICAL CAVITY, EACH INTERMITTENTLY TRANSMITTED SIGNAL BEING REFLECTED BY SAID CAVITY THROUGH SAID COUPLING TUBE AND BEING RECEIVED BY SAID TRANSDUCER PRIOR TO THE TRANSMISSION OF THE NEXT SUCCEEDING SIGNAL, MEANS UNIFORMLY VARYING THE FREQUENCY OF SUCCESSIVE SIGNALS INTERMITTENTLY TRANSMITTED THROUGH SAID COUPLING TUBE TO SAID CAVITY UNTIL A RESONANT CONDITION IS ESTABLISHED THEREIN, MEANS ELECTRICALLY CONNECTED TO SAID TRANSDUCER FOR YIELDING A VISUAL REPRESENTATION OF EACH TRANSMITTED SIGNAL AND THE REFLECTED SIGNAL CORRESPONDING THERETO WHEREBY A CONDITION OF ACOUSTIC RESONANCE WITHIN SAID CAVITY CAN BE DETERMINED, AND MEANS MEASURING THE FREQUENCY OF THE TRANSMITTED SIGNAL EFFECTING THE ESTABLISHMENT OF THE CONDITION OF ACOUSTIC RESONANCE WITHIN SAID CAVITY WHEREBY THE TEMPERATURE THERIN CAN BE DETERMINED.