Resistance temperature detector

Claim 1

A RESISTANCE TEMPERATURE DETECTOR FOR HIGH SPEED GAS TEMPERATURE MEASUREMENT COMPRISING A FIRST CHAMBER HAVING AN OPENING THEREIN THROUGH WHICH A FLUID MEDIUM FLOWS, SAID CHAMBER HAVING A DEPRESSED PORTION AT THE APPROXIMATE LONGITUDINAL CENTER THEREOF, A SECOND CHAMBER HAVING AN OPENING OF LARGER DIAMETER THAN SAID FIRST CHAMBER, SAID FIRST CHAMBER BEING INCLUDED IN SAID SECOND CHAMBER IN SPACED RELATIONSHIP THERETO AND HERMETICALLY CONNECTED AT EACH END THEREOF, TO PROVIDE A DOUBLE SHELLED WALL DEFINING THE SAID TWO CHAMBERS AND IN TURN ESTABLISHING A THIRD RELATIVELY THIN CHAMBER BETWEEN THE INNER AND OUTER WALLS OF SAID SHELL, AND LOCATED WITHIN SAID THIRD CHAMBER A TEMPERATURE-SENSITIVE ELEMENT IN SPACED RELATIONSHIP THERETO AND ELECTRICALLY INSULATED THEREFROM, SAID TEMPERATURE-SENSITIVE ELEMENT BEING A METAL WIRE HAVING A LENGTH SUBSTANTIALLY GREATER THAN ITS DIAMETER TO PROVIDE RAPID RESPONSE TO TEMPERATURE CHANGES, SAID WIRE BEING WOUND AROUND SAID FIRST CHAMBER IN A BIFILIAR RELATIONSHIP THERETO TO ENCHANCE THE RESPONSE OF SAID WIRE TO TEMPERATURE CHANGES IN SAID FIRST CHAMBER, AND A DEVICE ADAPTED TO MEASURE THE RESISTANCE OF SAID TEMPERATURE-SENSITIVE ELEMENT, SAID DEVICE INCLUDING ELECTRICAL LOW RESISTANCE, THIN-WIRE, LEAD-IN CONDUCTORS HERMETICALLY CONNECTED AT ONE END THEREOF TO SAID DEPRESSED PORTION TO HAVE A RELATIVELY LONG IMMERSION IN THE FLUID WHOSE TEMPERATURE IS TO BE MEASURED TO MINIMIZE THERMAL CONDUCTION BETWEEN SAID TEMPERATURE DETECTOR AND SAID FLUID.