The invention discloses a minitype piezoelectric telescopic element, a compression wave
measurement device and a compression wave measurement method for
centrifuge testing. The minitype piezoelectric telescopic element comprises a tubular substrate and a processed piezoelectric
ceramic piece, wherein the positive lead and the negative lead of a
signal shielding wire are connected with the surfaces of two sides of the piezoelectric
ceramic piece respectively, an inner
epoxy resin layer, a conductive
copper tape and an outer
epoxy resin layer cover the surface of each of two sides of the piezoelectric
ceramic piece, the
grounding line of the
signal shielding wire is connected with the conductive
copper tape, and the piezoelectric ceramic piece is fixed on one end surface of the tubular substrate. The compression wave
measurement device comprises a pair of minitype piezoelectric telescopic elements, a
signal generator, a power
amplifier, a principal axis
slip ring of the
centrifuge, a
charge amplifier, an
oscilloscope and the minitype piezoelectric telescopic element. According to the invention, good
electromagnetic shielding effect is achieved,
electromagnetic interference in the
centrifuge is eliminated, the excited compression wave has strong bundling
directivity, a reliable signal can be obtained in a strong interference environment, and the telescopic element has high compression wave excitation efficiency, and can be used in a
high attenuation nearly-saturated
water body.