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AssigneeAVL Gesellschaft fur Verbhrennungskraftmaschinen und Messtechnik m.b.H. Prof. Dr. Dr. h.c. Hans List
InventorsGunter Engel, Peter W. Krempl, Helmut List
Estimating the term…
In piecoelectric measuring elements comprising two or more crystal elements that are jointly subject to the mechanical variable to be measured and are provided with electrically conductive electrodes on opposite surfaces located essentially normal to the electric (x) axes of these crystal elements, disadvantages arising from shearing stresses can be prevented by using crystal elements (2) from crystals of point group 32, in which exist two opposite types of enantiomorphism, l and r, in which part of the crystal elements used belong to one of the two enantiomorphic types l or r, and have one of the two absolute orientations of the x-axis, .alpha..sub.1 or .alpha..sub.2, while the remaining crystal elements belong to the opposite enantiomorphic type and have the opposite orientation of the x-axis.
A piezoelectric measuring element for use in transducers, comprising two or more crystal elements from crystals of point group 32, said crystal elements existing in opposite enantiomorphic types l and r, and being jointly subject to a mechanical variable to be measured, belonging to the group of force, pressure and acceleration, said crystal elements carrying electrically conductive electrodes on surfaces that are located opposite of each other and are essentially normal to electric (x) axes of said crystal elements, wherein said measuring element consists of a first and a second group of crystal elements, each of said first and second group comprises at least one crystal element, and wherein said crystal elements of said first and second group belong to opposite enantiomorphic types l and r and have opposite absolute orientalions .alpha..sub.1 and .alpha..sub.2 of said x-axis.
Dependencies are inferred from the claim text.