Circuit arrangement for accurate measurement of temperatures or small temperature changes

Claim 1

A MEASURING ARRANGEMENT COMPRISING, IN COMBINATION: (A) A TUNED LC CIRCUIT HAVING A RESONANT FREQUENCY FO; (B) PULSE GENERATING MEANS FOR GENERATING PULSES AT A PULSE REPETITION FREQUENCY FIMP, FIMP BEING SUFFICIENTLY SMALLER THAN FO SO THAT A PLURALITY OF CYCLES OF OSCILLATIONS AT FREQUENCY FO BE INCLUDED IN THE INTERVAL BETWEEN ANY TWO SUCCESSIVE PULSES AT REPETITION FREQUENCY FIMP, SAID PULSE GENERATING MEANS BEING CONNECTED TO SAID CIRCUIT FOR INITIATING OSCILLATIONS IN THE SAME; (C) A FERROELECTRIC ELEMENT, SAID ELEMENT BEING A CAPACITOR USING A FERROELECTRIC DIELECTRIC; (D) FIRST CONDUCTIVE MEANS CONNECTING SAID ELEMENT TO SAID CIRCUIT FOR DAMPING SAID OSCILLATIONS IN RESPONSE TO THE POWER LOSS IN SAID ELEMENT; (E) A MEASURING INSTRUMENT; AND (F) SECOND CONDUCTIVE MEANS CONNECTING SAID MEASURING INSTRUMENT TO SAID CIRCUIT FOR INDICATION OF A VALUE BY THE INSTRUMENT IN RESPONSE TO THE AMPLITUDE OF THE OSCILLATIONS IN SAID CIRCUIT.