Temperature sensing apparatus

Claim 1

IN APPARATUS FOR MEASURING RADIANT HEAT ENERGY FROM A SOURCE THEREOF, THE COMBINATION OF, AN ENCLOSURE FORMED OF MATERIAL TRANSPARENT TO RADIANT HEAT ENERGY AND PROVIDING A CHAMBER TO BE EVACUATED, RADIANT HEAT REFLECTIVE COVER MEANS ON SAID ENCLOSURE DEFINING AN OPENING FOR ADMITTING RADIANT HEAT ENERGY FROM SAID SOURCE TO SAID CHAMBER, A VIBRATABLE ELEMENT WITHIN SAID CHAMBER HAVING A BIBRATION RESPONSE AT A FREQUENCY RELATED TO THE AMOUNT OF ADMITTED RADIANT HEAT ENERGY INCIDENT THEREON, MOUNTING MEANS FOR SAID ELEMENT APPLYING AN INITIAL STRESS THERETO, SHIELDING MEANS ASSOCIATED WITH SAID MOUNTING MEANS TO SUBSTANTIALLY PREVENT HEATING THEREOF BY RADIANT ENERGY RECEIVED FROM SAID SOURCE AND SHAPED FOR DIRECTING SUCH ENERGY TOWARD SAID ELEMENT, AND MEANS TO VIBRATE SAID ELEMENT AT ITS NATURAL FREQUENCY CORRESPONDING BOTH TO SAID STRESS AND TO THE INCIDENT RADIANT HEAT ENERGY RECEIVED DIRECTLY FROM SAID SOURCE AND ENERGY REDIRECTED BY SAID SHIELDING MEANS TO THEREBY PROVIDE A MEASURE OF THE HEAT ENERGY RADIATING FROM SAID SOURCE.