Abstract

An electromagnetic flowmeter apparatus for simultaneous measurements of pulmonary arterial and aortic blood flows in the conscious animal is described. The apparatus retains the basic features of the sine wave flowmeter and coreless flow transducers developed byKolin and provides for recordings from two adjacent transducers. The proximity of the implanted transducers results in a constant interaction which alters the techniques for calibration and zero flow determination which have been reported for single-flow measurements. The apparatus has linear frequency and phase shift characteristic to ensure undistorted flow measurement up to 50 c/s.

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