Device for pressure measurement using a resistor strain gauge
AssigneeFabrica Italiana Magneti Marelli, S.p.A.
InventorMaria Prudenziati
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Abstract
A pressure measurement device and a method for making it are disclosed. A plurality of thick-film resistors are screen-printed onto a deformable substrate, after which they are preferably fired. The resistors are then connected to circuitry for measuring changes in their respective resistances due to deformation of the substrate by an external force or pressure to be measured.
Claims8
In a device for pressure measurement of the type comprising a deformable substrate subjected to a pressure to be measured, a strain gauge disposed on said substrate, and electric circuit means connected with said strain gauge for sensing changes in the electrical resistance of said strain gauge as a function of the substrate formation, wherein said strain gauge is comprised of at least one thick film resistor having a strain gauge factor of at least 10 deposited on said substrate.
In a device for pressure measurement according to any one of the preceding claims, wherein said thick film resistors are formed by screen printing with an ink comprising at least one member of the group consisting of RuO.sub.2, IrO.sub.2, T1O.sub.2, Bi.sub.2 Ru.sub.2 O.sub.7, Pb.sub.2 Ru.sub.2 O.sub.7, Au, Pd and alloys thereof, in a dielectric matrix.
Dependencies are inferred from the claim text.