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:
Nov. 30, 1982
Filed:
Aug. 18, 1980
George A Volgyesi, Willowdale, CA;
The Hospital for Sick Children, Toronto, CA;
Abstract
The invention provides apparatus for measuring the rate of flow of liquid being circulated in a closed loop system by a pump using a bolus of indicator injected suddenly into the system upstream of the pump and a sampling station downstream of the pump. The apparatus includes signal means for location at the sampling station to provide an electrical signal proportional to the indicator passing this station. The electrical signal has an increasing portion, a decaying exponential portion, and a distorted portion caused by recirculation of the indicator in the system. A signal analyzer is coupled to the signal means to receive the electrical signal and includes a wave generator sensitive to the exponential portion and including extrapolation means for providing a portion of the exponential curve lost by interference by recirculation. The signal analyzer provides an output signal corresponding to the increasing portion, the exponential portion, and the portion provided by the extrapolation means. The apparatus also includes signal interruption means operable to discontinue the electrical signal before the curve reaches the distorted portion to avoid interference of this portion in the extrapolation of the exponential portion. Also, integrator means is coupled to the signal analyzer to receive the output signal and to provide a reading of the rate of flow of the liquid.