公开(公告)号：US3596501A

公开(公告)日：1971-08-03

申请号：US3596501D

申请日：1969-08-06

Applicant: ABBOTT LAB

Inventor： FORRY DONALD R ,  CUMMINGS CHARLES A ,  RUSSELL ROBERT ,  PERALTA BEN C ,  SCHAFFER ALBERT M ,  DENNY DALE A ,  WELCH WILLIAM H

IPC: G01M3/24 ,  G01M3/00

CPC classification number: G01M3/24

Abstract: A method and apparatus for testing the vacuum level in sealed containers includes a support for the container having an accelerometer attached thereto. The container and support is accelerated by an impacting hammer to cause hydrodynamic oscillations of the contents in the container which in turn are transmitted to and sensed by the accelerometer. If the vacuum level in the container is insufficient, the oscillations are damped and if the vacuum level is sufficient the container contents freely oscillate to produce vibrating oscillations in the container support. The accelerometer produces signals having characteristics correlated to the vibrating oscillations and the containers are accepted or rejected in response to the accelerometer signals.