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. 03, 1990
Filed:
Mar. 06, 1989
Jack Goldberg, San Diego, CA (US);
Ivac Corporation, San Diego, CA (US);
Abstract
The apparatus accurately measures flow rate of fluid within a conduit without direct fluid contact, based on the introduction of a thermal marker into the fluid stream by means of at least one externally mounted heater, and detection of the thermal marker by means of at least one externally mounted sensor. The transit time of the thermal marker can be ascertained for transit of the thermal marker from a heater to a sensor, or from one sensor to another sensor. A preferred embodiment of the heater comprises a resonant microwave cavity which heats the fluid radiatively, and a preferred embodiment of the sensor comprises a resonant microwave cavity through which a portion of the fluid conduit passes, the resonant characteristics of said microwave sensor being perturbed by the passage of the thermal marker.