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WO2005067515A3 - Optical flow monitor - Google Patents

Optical flow monitor Download PDF

Info

Publication number
WO2005067515A3
WO2005067515A3 PCT/US2004/000508 US2004000508W WO2005067515A3 WO 2005067515 A3 WO2005067515 A3 WO 2005067515A3 US 2004000508 W US2004000508 W US 2004000508W WO 2005067515 A3 WO2005067515 A3 WO 2005067515A3
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
fluid flow
paths
disturbance
detectors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2004/000508
Other languages
French (fr)
Other versions
WO2005067515A2 (en
Inventor
Mikhail Belenkii
Chris Sexton
Aake Larsson
Magnus Hallback
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maquet Critical Care AB
Trex Enterprises Corp
Original Assignee
Maquet Critical Care AB
Trex Enterprises Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maquet Critical Care AB, Trex Enterprises Corp filed Critical Maquet Critical Care AB
Priority to PCT/US2004/000508 priority Critical patent/WO2005067515A2/en
Publication of WO2005067515A2 publication Critical patent/WO2005067515A2/en
Publication of WO2005067515A3 publication Critical patent/WO2005067515A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/7044—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter using thermal tracers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/7086—Measuring the time taken to traverse a fixed distance using optical detecting arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A61B5/0873—Measuring breath flow using optical means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A61B5/0875—Measuring breath flow using means carried by the fluid stream, e.g. free-floating balls
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7253—Details of waveform analysis characterised by using transforms
    • A61B5/7257—Details of waveform analysis characterised by using transforms using Fourier transforms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/712—Measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

Fluid flow is determined by optically monitoring the time of travel of a disturbance in the fluid flow. Disturbance may be caused by heating the fluid such with a heater (6A, 16B) placed in the fluid flow path, or by injecting minute drops of water into the flowing air. Fluid flow is determined by projecting two coherent laser beams (14A, 14B) through the flowing fluid at two spaced-apart paths, providing means (18A, 18B) to generate interference patterns that are received by detectors (20A, 20B). The signals from the detectors (20A, 20B) are directed to a correlator (24) to determine the time required for the fluid to flow between the two paths. The distance between the two paths is known and the time provided by the correlator correlation of the two signals is used to determine the velocity.
PCT/US2004/000508 2004-01-06 2004-01-06 Optical flow monitor Ceased WO2005067515A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2004/000508 WO2005067515A2 (en) 2004-01-06 2004-01-06 Optical flow monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/000508 WO2005067515A2 (en) 2004-01-06 2004-01-06 Optical flow monitor

Publications (2)

Publication Number Publication Date
WO2005067515A2 WO2005067515A2 (en) 2005-07-28
WO2005067515A3 true WO2005067515A3 (en) 2006-01-19

Family

ID=34795953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/000508 Ceased WO2005067515A2 (en) 2004-01-06 2004-01-06 Optical flow monitor

Country Status (1)

Country Link
WO (1) WO2005067515A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0821188D0 (en) 2008-11-19 2008-12-24 Isis Innovation Measurment of gas concentrations in breath
US9222817B2 (en) * 2013-03-15 2015-12-29 Amphenol Thermometrics, Inc. Systems and methods for hybrid flow sensing

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201467A (en) * 1976-09-28 1980-05-06 Erwin Sick Gesellschaft Mit Beschrankter Haftung Optik-Elektronik Gas velocity meter
US5074658A (en) * 1989-07-31 1991-12-24 Syracuse University Laser capillary spectrophotometric acquisition of bivariate drop size and concentration data for liquid-liquid dispersion
US5153665A (en) * 1991-06-14 1992-10-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Vaporizing particle velocimeter
US20020007685A1 (en) * 2000-07-19 2002-01-24 Rainer Kunz Respiratory flow sensor
US6369881B1 (en) * 2000-05-19 2002-04-09 Optical Scientific, Inc. Optical flow sensor
US20030218738A1 (en) * 2002-05-23 2003-11-27 Mikhail Belenkii Optical flow monitor
US20040075824A1 (en) * 2002-05-23 2004-04-22 Mikhail Belenkii Optical flow monitor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201467A (en) * 1976-09-28 1980-05-06 Erwin Sick Gesellschaft Mit Beschrankter Haftung Optik-Elektronik Gas velocity meter
US5074658A (en) * 1989-07-31 1991-12-24 Syracuse University Laser capillary spectrophotometric acquisition of bivariate drop size and concentration data for liquid-liquid dispersion
US5153665A (en) * 1991-06-14 1992-10-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Vaporizing particle velocimeter
US6369881B1 (en) * 2000-05-19 2002-04-09 Optical Scientific, Inc. Optical flow sensor
US20020007685A1 (en) * 2000-07-19 2002-01-24 Rainer Kunz Respiratory flow sensor
US20030218738A1 (en) * 2002-05-23 2003-11-27 Mikhail Belenkii Optical flow monitor
US20040075824A1 (en) * 2002-05-23 2004-04-22 Mikhail Belenkii Optical flow monitor

Also Published As

Publication number Publication date
WO2005067515A2 (en) 2005-07-28

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