Instrumentation considerations for complex impedance measurements

Author

Ackmann, James J.

Author_Institution

Dept. of Neurosurg., Med. Coll. of Wisconsin, Milwaukee, WI, USA

fYear

1989

fDate

9-12 Nov 1989

Firstpage

1233

Abstract

The extension of complex impedance measurements and associated analytic techniques to the study of biologic systems is discussed. Because of the highly conductive nature of animal tissue, special care must be taken in instrumentation design to achieve useful data. A recently fabricated system for use in the frequency range from 5 Hz to 700 kHz is presented. At higher frequencies, the finite output capacitance of the current source (approximately 3 pf) and the finite input capacitance of the voltage sensing system (approximately 6 pf) cause unacceptable phase errors

Keywords

bioelectric phenomena; biological techniques and instruments; electric impedance measurement; 5 Hz to 700 kHz; animal tissue; biologic systems; complex impedance measurements; current source; finite input capacitance; finite output capacitance; frequency range; instrumentation design; phase errors; voltage sensing system; Amplifiers; Biological materials; Capacitance; Composite materials; Conducting materials; Frequency; Impedance measurement; Instruments; Neurosurgery; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in

Conference_Location

Seattle, WA

Type

conf

DOI

10.1109/IEMBS.1989.96170

Filename

96170