PIEZOELECTRIC PICKUP Russian patent published in 1998 - IPC

FIELD: recording of seismic vibrations and parameters of absolute vibration. SUBSTANCE: piezoelectric pickup has case, inertial mass composed of liquid and loose material placed into closed space formed by cap membranes. One of them carries piezoelement. Ratio of volumes of liquid and loose material is chosen from condition , where H is height of closed space; ΔT is range of working temperatures; h is thickness of assembly of cap membrane with piezoelement; α l ,α l.m are coefficients of volumetric expansion of liquid and loose material; ρ l.m ,ρ s are densities of loose material and its solid phase; V l.m ,V l are volumes of loose material and liquid. EFFECT: simplified design, expanded technological and operational capabilities with simultaneous widening of working range of temperatures. 1 cl, 2 dwg