Abstract
Skin measurements made using the Doppler method can be used to monitor blood flow and involuntary body movements. The spectra of the Doppler signal indicate that it is dominated by the involuntary body movements and that the blood flow is detectable only at higher frequencies. Some separation of the two signals is therefore possible if an active high-pass filter is used. By this means the blood-flow parameter has been measured during artificial variations of the blood flow and at different parts of the body. A special arrangement of optical fibres allows the scattered light and its mean intensity at the same location to be detected separately. The influence of intensity variations is compensated without using any time constant.
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