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Evaluation of a constant-temperature hot-wire anemometer for respiratory-gas-flow measurements

  • J. S. Lundsgaard
  • J. Grønlund
  • N. Einer-Jensen
Article

Abstract

The performance of a constant-temperature hot-wire anemometer for respiratory-gas-flow measurement has bee investigated. It is shown that the anemometer satisfies common demands with respect to accuracy, response time and to insensitivity to humidity and temperature variations. A calibration method is suggested that permits correction for variation of the flowmeter signal caused by changes of the gas composition. Finally, a procedure for linearisation of the flowmeter signal as a function of flow rate is presented.

Keywords

Hot-wire anemometer Respiratory-gas-flow measurements 

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References

  1. Comte-Bellot, G. (1976) Hot-wire anemometry.Ann. Rev. Fluid Mech.,8, 209–231.CrossRefGoogle Scholar
  2. Fitzgerald, M. X., Smith, A. A. andGaensler, E. A. (1973) Evaluation of ‘electronic’ spirometers.New England J. Med.,289, 1283–1288.CrossRefGoogle Scholar
  3. Franetzki, M. (1975) Die elastische Blende als Atemstromrezeptor. Grundlagen eines neuen messprinzips. Dissertation zur Erlange des akademischen Grades eines Doktor-Ingenieurs, Karlsruhe Technische Hochschule, 22–27.Google Scholar
  4. Janssen, J. M. L., Ensing, L. andVan Erp, J. B. (1959) A constant-temperature-operated hot-wire anemometer.Proc. IRE,47, 555–567.Google Scholar
  5. King, L. V. (1915) On the precision measurement of air velocity by means of the linear hot-wire anemometer.Philosophical Magazine,29/6, 556–577.Google Scholar
  6. Lundsgaard, J. S., Einer-Jensen, N. andJuhl, B. (1977) High precision mixing of anesthetic gases based on a new principle.Acta anaesth. Scand.,21, 308–313.CrossRefGoogle Scholar
  7. Mcquaid, J. andWright, W. (1973) The response of a hot-wire anemometer in flows of gas mixtures.Int. J. Heat Mass Transfer,15, 819–828.CrossRefGoogle Scholar

Copyright information

© IFMBE 1979

Authors and Affiliations

  • J. S. Lundsgaard
    • 1
  • J. Grønlund
    • 1
  • N. Einer-Jensen
    • 1
  1. 1.Department of PhysiologyUniversity of OdenseOdense MDenmark

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