Method of and apparatus for flow measurements

• US 3,269,386 A
• Filed: 07/12/1963
• Issued: 08/30/1966
• Est. Priority Date: 07/12/1963
• Status: Expired due to Term

• Current Assignee: Herbert Sherman
• Original Assignee: Herbert Sherman
• Inventors: HERBERT SHERMAN
• Application Number:
  US04/294,561
• Time in Patent Office: 1,145 Days
• US Class Current: 600/526
• CPC Class Codes: A61B 5/0275 using tracers, e.g. dye dilution
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61B 5/7242 using integration
• CPC Class Codes: G01F 1/704 using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter G01F1/76, G01F25/00 take precedence

Claims

1. A METHOD OF COMPUTING THE AREA UNDER A BLOODCARRIED INJECTANT CONCENTRATION-CURVE, AN UNKNOWN PREDETERMINED PORTION OF WHICH FOLLOWS A SUBSTANTIALLY DECAYING EXPONENTIAL LAW HAVING A PREDETERMINED NEGATIVE-SLOPE CHARACTERISTIC, THAT COMPRISES, A PRODUCING SUCCESSIVE ELECTRICAL SIGNALS THAT ARE THE ANALOG OF THE CURVE, CONTINUALLY INTEGRATING THE SIGNALS, CONTINUALLY PREDICTING FROM THE SUCCESSIVE SIGNALS SUCCESSIVE AREAS CORRESPONDING TO AREAS UNDER PREDICTED CURVES FOLLOWING THE SAID SUBSTANTIALLY EXPONENTIAL LAW, MONITORING THE SIGNALS UNTIL A SIGNAL IS REACHED THAT HAS THE SAID PREDETERMINED NEGATIVE-SLOPE CHARACTERISTIC, AND THEREUPON ADDING TO THE INTEGRATED SIGNALS THE THEN-PREDICTED AREA TO PRODUCE A MEASURE OF THE RATE OF FLOW OF THE INJECTANT.