Temperature sensor utilizing thermal noise and thermal couple elements, and associated connecting cable
First Claim
Patent Images
1. A temperature sensor comprising:
- a metallic protective casing;
a resistive element generating a temperature-dependent noise voltage and disposed within said casing and having at least one conductor independent from said casing extending therethrough in insulated relationship from said casing; and
a thermoelectric element in said casing having first and second leads forming a junction generating a temperature-dependent electromotive force, said conductor being tubular, composed of a nonmagnetic material, and surrounding only one of said leads while being electrically insulated therefrom, said noise voltage being measured across said tubular conductor and a further conductor independent from said one of said leads, said electromotive force being measured across said leads.
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Abstract
A temperature sensor utilizes a resistive element and a thermocouple. One or more leads of the thermocouple are surrounded (electrically insulated) by a conductor or conductors constituting the connections to the resistive element. The conductors are made of a nonmagnetic material. In one embodiment, the second thermocouple lead is constructed as a hollow pipe which constitutes a protective outer casing for the necessary unit, as well as a connection to the resistive element. Embodiments utilizing a plurality of thermocouples are illustrated, as is a similarly constructed cable for connecting the sensor unit to measuring apparatus.
18 Citations
15 Claims
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1. A temperature sensor comprising:
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a metallic protective casing; a resistive element generating a temperature-dependent noise voltage and disposed within said casing and having at least one conductor independent from said casing extending therethrough in insulated relationship from said casing; and a thermoelectric element in said casing having first and second leads forming a junction generating a temperature-dependent electromotive force, said conductor being tubular, composed of a nonmagnetic material, and surrounding only one of said leads while being electrically insulated therefrom, said noise voltage being measured across said tubular conductor and a further conductor independent from said one of said leads, said electromotive force being measured across said leads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A connecting cable for a temperature sensor comprising a resistive element generating a temperature-dependent noise voltage and a pair of thermoelectric elements forming respective junctions generating a temperature-dependent electromotive force, said cable comprising:
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a conductive casing; at least two tubular conductors of a nonmagnetic material independent of said casing extending therethrough in insulating relationshp from said casing and connected to respective terminals of said resistive element for deriving said temperature-dependent noise voltage therefrom; and a pair of leads connected to each of said thermoelectric elements and extending through said casing, one of said leads of each pair traversing a respective one of said conductors and being electrically insulated therefrom. - View Dependent Claims (12, 13, 14, 15)
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Specification