Patent ID: 7784329

Claim:
A shear or compression piezorheometer cell, comprising: two sample-holder blades ( 2 , 2 ′) that clamp between them a sample ( 3 ) to be analyzed, piezoelectric ceramic elements ( 4 , 4 ′) relative to the faces of the blades that are opposite to the faces in contact with the sample, and a frame ( 5 , 5 ′) that keeps the arrangement of blades and ceramic elements compressed, wherein at least one said ceramic element ( 4 ), denoted emitting ceramic below, is stuck to or made cohesive with one of the two blades or emitting blade and subjects the latter to shear or compression vibrations under the action of an excitation signal, and at least one said ceramic element ( 4 ′), denoted receiving ceramic below, is stuck to or made cohesive with the other blade or receiving blade and transforms the constraints or stress to which the latter is subjected into a measuring signal, wherein the emitting and receiving ceramics are placed so that the respective polarizations of the emitting ceramic ( 4 ) and the receiving ceramic ( 4 ′), or the respective resulting polarizations of the emitting ceramics ( 4 ) and receiving ceramics ( 4 ′) are parallel, wherein said respective polarizations are of the same direction, wherein the sample-holder blades ( 2 , 2 ′) have an increased thickness, and wherein one or more shield part(s) ( 6 ), designed to limit the electrostatic radiation and the electrostatic coupling that results between the emitting ceramic(s) ( 4 ) and the receiving ceramic(s) ( 4 ′), are mounted in the frame ( 5 , 5 ′), and further comprising an additional covering blade ( 2 ″) that is removably attached to at least one of the sample-holder blades, wherein at the level of a face of the additional covering blade ( 2 ″) in contact with the sample ( 3 ) to be analyzed, the sample-holder blades ( 2 and 2 ′) comprise a surface treatment that prevents or promotes the sliding of the sample ( 3 ) or orients the sample at the level of said face in contact with the sample.