The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 1989
Filed:
Dec. 31, 1987
Maurice W Slack, Edmonton, CA;
Centre for Frontier Engineering Research, Edmonton, CA;
Abstract
A method is provided for directly measuring the contact pressure on the mating interfaces of two solids undergoing compression where the interfacial region contains an entrapped film of liquid. An acoustic pulse is directed at either interface. A reference amplitude of the acoustic pulse reflected from the interface is measured as it bears initial contact pressure. A second 'loaded' amplitude of the acoustic pulse reflected from the interface is measured when the interface is bearing a different contact pressure. A measure indicative of the change in contact pressure is computed from the ratio of the reference and loaded amplitude measurements by correlation with a calibration curve.