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:
Jul. 22, 1986
Filed:
May. 01, 1984
Alvin E Brown, Santa Cruz, CA (US);
Manning Technologies, Inc., Scotts Valley, CA (US);
Abstract
An ultrasonic flowmeter of the upstream-downstream type having piezoelectric crystals operated in the radial mode, as well as the compression mode, or primarily the radial mode. If both modes are used, one of the two may be selected in order to optimize the received signal. Selection would depend upon the molecular weight and temperature of the viscous fluid in the flowmeter. The selected frequency would be below the relaxation frequency of the flowing material. Radial mode oscillations are achieved by mass loading members adhered to either side of the crystal, thereby creating acoustic impedances which dampen the compressional mode, but enhance the radial mode of vibration. The mass loading member rearward of the crystal is significantly larger than the forward member so that most of the energy to be transmitted is directed in a forward direction. The forward end of the crystal is mounted in a tubular housing which is inserted into a pipe opening into a larger pipe where fluid flow occurs.