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GB1397113A - Spirometer - Google Patents

Spirometer

Info

Publication number
GB1397113A
GB1397113A GB2648372A GB2648372A GB1397113A GB 1397113 A GB1397113 A GB 1397113A GB 2648372 A GB2648372 A GB 2648372A GB 2648372 A GB2648372 A GB 2648372A GB 1397113 A GB1397113 A GB 1397113A
Authority
GB
United Kingdom
Prior art keywords
bridge
thermistor
flow
fluid
june
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.)
Expired
Application number
GB2648372A
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.)
Sandoz AG
Original Assignee
Sandoz AG
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 Sandoz AG filed Critical Sandoz AG
Publication of GB1397113A publication Critical patent/GB1397113A/en
Expired 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
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • 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
    • A61B5/0878—Measuring breath flow using temperature sensing means

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Pulmonology (AREA)
  • General Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physiology (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measuring Volume Flow (AREA)

Abstract

1397113 Measuring fluid-flow electrically SANDOZ Ltd 7 June 1972 [11 June 1971] 26483/72 Heading GIN A spirometer comprises a heated W.T.C. thermistor R2 operating typically at 200 ‹C, over which fluid-flow to be monitored may be directed, mounted in a sensing circuit in the form of a resistance bridge circuit 13 coupled with inputs of a difference amplifier 15 which amplifies a bridge imbalance signal across junctions J 1 , J 2 caused by cooling of the thermistor due to fluidflow and applies it via emitter follower 17 to junction J3 of the bridge to increase current through the thermistor and cause it to assume its operating temperature when the bridge will be substantially rebalanced, voltmeter 16 monitoring the potential across the bridge junctions J 3 , J 4 which potential is a function of fluid-flow.
GB2648372A 1971-06-11 1972-06-07 Spirometer Expired GB1397113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15238471A 1971-06-11 1971-06-11

Publications (1)

Publication Number Publication Date
GB1397113A true GB1397113A (en) 1975-06-11

Family

ID=22542689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2648372A Expired GB1397113A (en) 1971-06-11 1972-06-07 Spirometer

Country Status (8)

Country Link
JP (1) JPS56150507U (en)
CA (1) CA962089A (en)
CH (1) CH549218A (en)
DE (1) DE2227067A1 (en)
FR (1) FR2141312A5 (en)
GB (1) GB1397113A (en)
IT (1) IT956445B (en)
SU (1) SU508161A3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562731A (en) * 1979-07-24 1986-01-07 Hitachi, Ltd. Air flow meter
US5869758A (en) * 1992-11-02 1999-02-09 Gascontrol B.V. Method and apparatus for measuring the flow rate of a medium flow

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2444511C3 (en) * 1974-09-18 1981-07-30 Volkswagenwerk Ag, 3180 Wolfsburg Thermal flow meter for gaseous media
JPS5543447A (en) * 1978-09-22 1980-03-27 Hitachi Ltd Hot-wire type flow rate measuring device
FR2459962A1 (en) * 1979-06-25 1981-01-16 Assistance Tech Med Hot wire gas flow detector - contains comparator and amplifier in servo loop to maintain temp. constant and can measure low flow rates
FR2667147A1 (en) * 1990-09-25 1992-03-27 Cit Alcatel LIQUID LEVEL DETECTOR.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562731A (en) * 1979-07-24 1986-01-07 Hitachi, Ltd. Air flow meter
US5869758A (en) * 1992-11-02 1999-02-09 Gascontrol B.V. Method and apparatus for measuring the flow rate of a medium flow

Also Published As

Publication number Publication date
CH549218A (en) 1974-05-15
IT956445B (en) 1973-10-10
SU508161A3 (en) 1976-03-25
FR2141312A5 (en) 1973-01-19
DE2227067A1 (en) 1973-01-04
JPS56150507U (en) 1981-11-11
CA962089A (en) 1975-02-04

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee