caa a22 4500 46578304X CHVBK 20180323112000.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02441675 doi (NATIONALLICENCE)springer-10.1007/BF02441675 Two-frequency impedance plethysmograph: real and imaginary parts [Elektronische Daten] [A. Lozano, J. Rosell, R. Pallás-Areny] 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. IFMBE, 1990 Coherent nationallicence demodulation nationallicence Current isolation nationallicence Impedance plethysmography nationallicence Transthoracic impedance nationallicence Waveforn synthesiser nationallicence Lozano A. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut Rosell J. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut Pallás-Areny R. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/1(1990-01-01), 38-42 0140-0118 28:1<38 1990 28 11517 https://doi.org/10.1007/BF02441675 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02441675 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lozano A. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut NATIONALLICENCE 700 1- Rosell J. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut NATIONALLICENCE 700 1- Pallás-Areny R. Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, PO Box 30002, 08080, Barcelona, Spain aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/1(1990-01-01), 38-42 0140-0118 28:1<38 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer