Electrode having multiple temperature-sensitive junctions

Details Electrode having multiple temperature-sensitive junctions Electrode having multiple temperature-sensitive junctions

A - Human Necessities

61

B

A61B 18/14 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2327437

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 he 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.

Cet appareil, produisant plusieurs signaux dont chacun est représentatif d'une température en un point donné d'une électrode faite d'un premier métal, comporte plusieurs fils capteurs conducteurs reliés, chacun, à l'électrode pour constituer une jonction de détection. Chaque jonction de détection a une tension tributaire de la température qui lui est associée. Un fil commun conducteur est connecté à l'électrode afin de constituer une jonction commune. Ce fil commun est fait d'un second métal de manière à interdire sensiblement une association avec la tension tributaire de la température. Chaque fil capteur est fait d'un métal différent du premier métal susmentionné. Chaque métal possède un coefficient de Seebeck connu relativement au premier métal. Le rapport de grandeur du coefficient de Seebeck du métal du fil capteur relativement au premier métal et le rapport de grandeur du coefficient de Seebeck du métal du fil commun relativement au premier métal sont au moins de dix pour un. Le fil commun, qui fait montre, généralement, d'une sortie thermoélectrique analogue à celle du premier métal, peut être fait de ce premier métal.

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