Electrode having composition-matched, common-lead thermocouple w

Details Electrode having composition-matched, common-lead thermocouple w Electrode having composition-matched, common-lead thermocouple w

1998-05-05

2000-03-28

Dvorak, Linda C. M.

Surgery

Instruments

Electrical application

606 41, 607122, 607101, A61B 1739

Patent

active

060425806

ABSTRACT:
An apparatus for providing a plurality of signals, each indicative of a temperature at an individual location on an electrode which is formed of a first metallic material includes a plurality of electrically conductive sensor leads, each individually connected to the electrode to form a sensor junction. Each sensor junction has a temperature-dependent voltage associated with it. An electrically conductive common lead is connected to the electrode to form a common junction. The common lead is formed of a second metallic material such that substantially no temperature-dependent voltage is associated with the common junction. Each of the sensor leads is formed of a metallic material different than the first metallic material. Each metallic material has a known Seebeck coefficient relative to the first metallic material. The ratio of the magnitude of the Seebeck coefficient of the sensor lead metallic material relative to the first metallic material and the magnitude of the Seebeck coefficient of the common lead metallic material relative to the first metallic material is at least ten to one. The common lead generally exhibits a thermoelectric output similar to the first metallic material and may be formed of the first metallic material.

REFERENCES:
patent: 4966597 (1990-10-01), Cosman
ISHM '87 Proceedings "Taming Thermocouple Voltages in Microelectronics" by Roy Chapel, pp. 104-112.
"The Thermocouple", Omega Catalog, vol. 27, pp. Z9-Z20.

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