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J Appl Physiol 65: 1430-1435, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 3 1430-1435, Copyright © 1988 by American Physiological Society

ARTICLES

A compensation method for membrane-covered (Clark) electrodes

S. A. Barton, C. E. Hahn and A. M. Black
Nuffield Department of Anaesthetics, University of Oxford, United Kingdom.

Membrane-covered electrodes (Clark electrodes) are widely used for monitoring blood gases, particularly PO2. A method of compensating for the inherently limited speed of response of Clark electrodes is presented. The theoretical response in the time domain is related to that in the frequency domain, and the latter is deduced from measurement of the former. Although the response functions are both infinite series, both responses are nevertheless completely defined by a single time parameter Te characteristic of the electrode under given measurement conditions. Practical verification was performed using electrodes in the double-pulsed mode, but the theory is applicable equally to direct-current-polarized and simply pulsed electrodes.




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