A method and apparatus for measuring forces in the presence...

G - Physics – 01 – L

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G01L 1/22 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2380372

In order to measure forces F exerted on a part in a given direction and in the presence of an external pressure p, the part has integrated therein a sensor (10) which delivers an output signal of the form S = .alpha..F + .beta..p + .gamma., and said sensor is dimensioned in such a manner as to cause the coefficient .beta. to be zero. To this end, a sensor (10) is used that includes a tube (12) formed by a thinner walled portion (12a) and a thicker walled portion (12b), together with strain gauges (16a, 16b, 18a, 20) mounted in the tube (12) and interconnected to form a Wheatstone bridge.

Pour mesurer des forces F exercées sur une partie dans un sens donné et en présence d'une pression extérieure p, la partie renferme un capteur (10) qui fournit un signal de sortie sous la forme de S= .alpha..F + .beta..p + .gamma., et les dimensions dudit capteur sont telles qu'elles contraignent le coefficient .beta. à zéro. A cet effet, un capteur (10) est utilisé. Ledit capteur comprend un tube (12) formé d'une partie à paroi mince (12a) et d'une partie à paroi épaisse (12b), ainsi qu'à des jauges de contrainte (16a, 16b, 18a, 20) montées dans le tube (12) et reliées entre elles de façon à former un pont de Wheatstone.

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