Wheatstone bridge with temperature gradient compensation

G - Physics – 01 – R

Patent

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Details

G01R 1/44 (2006.01) G01D 3/036 (2006.01) G01L 1/22 (2006.01) G01L 9/04 (2006.01) G01R 17/10 (2006.01)

Patent

CA 2238017

The output voltage of an electrical circuit such as a Wheatstone bridge comprising four main resistors (J1 to J4) having substantially the same resistance value (R) and substantially the same temperature coefficient of resistance .alpha. is rendered insensitive to temperature differentials between the bridge arms by mounting a compensating element (r1 to r4) in each arm in series with the main resistor. Each compensating element is physically very close to a main resistor in one of the adjacent bridge arms so that it has the same temperature as said resistor. The compensating elements have the same resistance value r and the same TCR .beta., with R.alpha. = r.beta., where r is less than R and preferably r/R 1/2, in order to limit the drop in sensitivity of the Wheatstone bridge.

La tension de sortie d'un circuit électrique du type pont de Wheatstone comportant quatre résistances principales (J¿1? à J¿4?) ayant sensiblement la même valeur ohmique, R, et sensiblement le même coefficient de température de résistance, .alpha., est rendue indépendante des différences de température existantes entre les branches du pont par l'adjonction dans chacune des branches d'un élément de compensation (r¿1? à r¿4?) en série avec la résistance principale, chaque élément de compensation étant agencé physiquement très proche d'une résistance principale située dans une des branches adjacentes du pont afin de présenter la même température que celle-ci. Les éléments de compensation ont la même valeur ohmique r et même CTR .beta., avec R.alpha.=r.beta., r étant inférieur à R et, de préférence, r/R?1/2, afin de limiter la diminution de sensibilité du pont de Wheatstone.

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