Abstract
An optical method for measuring the frequency response of pressure transducers is described. The method allows the calculation of the varying pressure of ate pressure. Displacement is measured by a photodetector position sensor with the aid of a laser beam reflected on a mirror attached to the loudspeaker diaphragm. The method is based on the short time response of the optical system and it presents some advantages with regard to the usual dynamic calibration using a microphone reference: (a) it has a good response at low frequencies; (b) it is unaffected by environmental conditions; and (c) the system can easily be recalibrated.
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References
ACCP (American College of Chest Physicians) (1983) Statement on spirometry.Chest,3, 547–550.
ATS (American Thoracic Society) (1979) ATS-Snowbird Workshop on standardization of spirometry.Am. Rev. Respirat. Dis.,119, 831–838.
Bargeton, D., Barres, G. andGauge, P. (1964) Relation pression-volume dans le plethysmographe à air.J. Physiol. Paris,56, 282–283.
Chijiiwa, M. andMorii, T. (1982) Measurement of vibrations in audio components using a laser vibrometer.Meas. & Analysis Disa Infor.,27, 3–7.
ECCS (European Community for Coal and Steel) (1983) Standardized lung function testing.Bull. Europ. Physiopha. Respir.,19, Suppl. 5.
Francis, G., Gelfand, R. andPeterson, R. E. (1979) Effects of gas density on the frequency response of gas-filled pressure tranducers.J. Appl. Physiol.,47, 631–637.
Jackson, A. C. andVinegar, A. (1979) A technique for measuring frequency response of pressure, volume and flow transducers. —Ibid.,,47, 462–467.
Lemen, R. J., Gerdes, C. B., Wegmann, M. J. andPerrin, K. J. (1982) Frequency spectra of flow and volume events for forced vital capacity.—Ibid.,53, 977–984.
McCall, C. B., Hyatt, R. E., Noble, F. W. andFry, D. L. (1957) Harmonic content of certain respiratory flow phenomena of normal individuals.—Ibid.,10, 215–218.
Peslin, R., Jardin, P., Bohadana, A. andHannhart, B. (1982) Contennu harmonique du signal de debit pendant l'expiration forcée chez l'homme normal.Clin. Respirat. Physiol.,18, 491–500.
USA-NBS (US Department of Commerce. National Bureau of Standards) (1963) Methods for the dynamic calibration of pressure transducers. NBS Monograph 67.
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Farré, R., Navajas, D. & Rotger, M.M. Optical method for determining the frequency response of pressure-measurement systems in respiratory mechanics. Med. Biol. Eng. Comput. 24, 78–82 (1986). https://doi.org/10.1007/BF02441609
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DOI: https://doi.org/10.1007/BF02441609