Thin film resistance thermometer detector probe assembly
First Claim
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1. A resistance thermometer detector probe comprising:
- a cylindrical sleeve;
insulator means for carrying leads through said sleeve;
a header mounted in the end of said sleeve, said header includinga first button of thermally conductive material;
a second button of a soft metal having a high thermal conductivity and a high diffusivity;
a third button of insulating material;
means for joining said buttons so that said second button is sandwiched between the first and third buttons with good thermal contact therebetween;
thick film deposits on the exposed surface of said third button, one of said deposits being in the center region of the surface and two other deposits being located in flanking relationship to the center region;
a thin film resistance thermometer chip affixed to said center region;
connectors for providing connection of said leads with the respective flanking regions; and
means for electrically connecting said resistance thermometer between said flanking regions.
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Abstract
A resistance thermometer probe assembly is constructed by locating a header assembly in the end of a cylindrical sleeve. The header is constructed as a stack of discs. The disc exposed to the environment is of stainless steel and the disc supporting the thin film resistance thermometer chip is of ceramic. A copper disc is brazed between the ceramic and the stainless steel to accommodate the different thermal coefficients of expansion. Nail-head pins are brazed to a thick film deposit on the exposed face of the ceramic disc and the resistance thermometer chip is connected electrically between the pins.
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Citations
7 Claims
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1. A resistance thermometer detector probe comprising:
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a cylindrical sleeve; insulator means for carrying leads through said sleeve; a header mounted in the end of said sleeve, said header including a first button of thermally conductive material; a second button of a soft metal having a high thermal conductivity and a high diffusivity; a third button of insulating material; means for joining said buttons so that said second button is sandwiched between the first and third buttons with good thermal contact therebetween; thick film deposits on the exposed surface of said third button, one of said deposits being in the center region of the surface and two other deposits being located in flanking relationship to the center region; a thin film resistance thermometer chip affixed to said center region; connectors for providing connection of said leads with the respective flanking regions; and means for electrically connecting said resistance thermometer between said flanking regions. - View Dependent Claims (2, 3, 4)
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5. A header for a resistance thermometer probe comprising:
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a first button of thermally conductive, environmentally resistant material; a second button of a soft metal having a high thermal conductivity and a high diffusivity; a third button of electrically insulating material; means for joining said buttons to form a button stack with said second button sandwiched between said first and third buttons so that there is good thermal contact therebetween; a thick film deposit on the exposed surface of said third button; and a thin film resistance thermometer chip affixed to said thick film deposit so it has good thermal contact with said third button. - View Dependent Claims (6, 7)
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Specification