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J Appl Physiol 44: 619-622, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 44, Issue 4 619-622, Copyright © 1978 by American Physiological Society

ARTICLES

Respiratory flow integrator with improved stability

N. S. Deno, H. L. Barlett and E. R. Buskirk

A circuit was designed for integrating respiratory flow signals over time to produce volume signals. The circuit involves a simple integrator and three compensation subcircuits which control integrator drift caused by ambient temperature changes, flow signal base-line errors, and random signal errors. A functional unit built according to the circuit design requires initial adjustment, but no further adjustment before or during sustained use. Integration errors are typically less than 1%. The only flow signal requirements are that they be bidirectional and within the human physiological frequency range.




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