Method and apparatus for continuously measuring volumetric flow

摘要: Method and apparatus for adapting the volumetric flow rate measurement system thaught by Yelderman in U.S. Patent No. 4,507,974 to clinical environments reducing effects of physiological noise. Signal processing techniques are used characterize background noise power spectrum under test so that effect aberrations on measured data may be eliminated predominant periodicities spectra avoided. The invention further cross-correlates input with corresponding output determine weighting values each frequency collected at noisy frequencies is discounted. Low or drift also removed from signal fitting average a quadratic function which then subtracted original signal, point point. Finally, processed fit lagged normal distribution curve domain solve parameters necessary mathematically model transfer system. Given as well system, determined virtually any even very environments.