Two-point calibration procedure of the forced oscillation technique

Medical & Biological Engineering & Computing
K DesagerK P Van de Woestijne

Abstract

The forced oscillation technique is usually calibrated by loading the measuring device with a known impedance. A correction function is calculated, relating the measured and reference impedances at each frequency. However, this one point calibration procedure does not account for transducer asymmetry. A procedure has previously been presented to circumvent this problem: in addition to one known reference impedance, the calibration was repeated with the system occluded (infinite impedance). The aim of the present study was to evaluate a variant of this procedure, in which instead of resorting to an extreme condition imposing high requirements on the flow measuring system, two reference loads of 4 and 50 hPal-1 s were measured, thus covering the range of impedances observed in children and infants (a two-point procedure). The calibration procedure was performed with these two impedances and evaluated with a third impedance of approximately 17 hPal-1 s. The results of three calibration procedures were compared: one-point, two-point and a previously reported calibration procedure. Impedances consisted of sintered glass and mesh wire screens mounted in glass or polyvinyl tubes. For low impedance values, in the range of 4 to 17 hPal-...Continue Reading

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Citations

Dec 15, 2010·Computer Methods and Programs in Biomedicine·Clara IonescuRobin De Keyser
Jan 13, 2015·Respirology : Official Journal of the Asian Pacific Society of Respirology·Diane GrayZoltán Hantos
Sep 14, 1999·Journal of Applied Physiology·K N DesagerK P van de Woestijne

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