Two-frequency impedance plethysmograph: real and imaginary parts

Albert Lozano-Nieto; J. Rosell; R. Pallás-Areny

doi:10.1007/BF02441675

Two-frequency impedance plethysmograph: real and imaginary parts

Albert Lozano-Nieto, J. Rosell, R. Pallás-Areny

Penn State Wilkes-Barre

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

A four-channel impedance plethysmograph has been designed. Impedance signals are obtained at two frequencies by measuring both real and imaginary parts. Particular attention has been paid to the sine wave generation circuits that provide system versatility. The required phase-sensitive demodulation is achieved by means of analogue multiplexers. Results show that there are significant variations in the thoracic equivalent capacitance related to respiration and that there is an increased sensitivity to cardiac activity at low frequencies.

Original language	English (US)
Pages (from-to)	38-42
Number of pages	5
Journal	Medical & Biological Engineering & Computing
Volume	28
Issue number	1
DOIs	https://doi.org/10.1007/BF02441675
State	Published - Jan 1 1990

All Science Journal Classification (ASJC) codes

Biomedical Engineering
Computer Science Applications

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Two-frequency impedance plethysmograph: real and imaginary parts

Abstract

All Science Journal Classification (ASJC) codes

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