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A New Instrument for Continuous Measurement of Tissue Blood Flow by Light Beating Spectroscopy

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3 Author(s)
Nilsson, Gert E. ; Department of Biomedical Engineering, Linkoping University ; Tenland, Torsten ; Oberg, P.Ake

A new instrument for measurement of regional tissue blood flow based on the laser Doppler principle is reported. The theoretical background of light beating spectroscopy is discussed and a detection technique which makes possible the suppression of the adverse effects of laser-mode interference and wide-band beam amplitude noise is described. Instead of using a single square-law photodetector a differential detector technique is introduced that reduces common-mode noise to a negligible level, without influencing the blood flow related signal. The new instrument has proved to be highly stable and sensitive. Continuous recordings of tissue blood flow can be performed in the laboratory as well as at the bedside.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:BME-27 ,  Issue: 1 )

Date of Publication:

Jan. 1980

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