G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/12 (2006.01) G01L 1/14 (2006.01) G01L 3/00 (2006.01) G01L 9/00 (2006.01)
Patent
CA 2145971
ABSTRACT The present invention relates to pressure and torque transducers using relatively small capacitors and micro displacements for use in high pressure transducers requiring a wide pressure range of operations under changing temperature conditions and for producing measurements with great accuracy. In the present invention, four capacitors are defined by spaced apart capacitor plates respectively located on spaced apart capacitor base members. The capacitor base members are vertically arranged in a housing. The capacitor plates for each capacitor are disposed at equally offset locations relative to a central vertical axis for the device so that two capacitors are located on either side of the vertical axis. One of the capacitor base members has a movable section which can be angularly torques or displaced about a vertical torque axis by an applied torque force to dependently vary the respective capacitance of two of the capacitors, herein referred to as "measurement capacitors". The angular torque is obtained by a spirally wound bourdon tube which, when subjected to internal fluid pressure, produces a torque about the torque axis. The torque axis is centrally located in the angularly displaceable capacitor base member. The other two capacitors are fixed spacially with respect to one another on the base members and are herein referred to as "reference capacitors". By arranging the capacitor base members of the measurement capacitors so that related capacitance between capacitor plates on the base member are varied as a function of an angular relationship of the capacitor plates relative to a mid-plane, a high capacitance sensitivity can be obtained with low angular torque deflection.
Panex Corporation
Smart & Biggar
LandOfFree
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