| 摘要 |
The device serves to optically determine physiological variables in perfused tissue. The device comprises a first and a second light source which each emit light radiation of a first or a second predetermined wavelength. The light sources are arranged in such a manner that the light radiation exiting them can penetrate into the perfused tissue. At least one photodetector is used, which is arranged so that it detects the light emitted by the light sources and passing through or backscattered by the perfused tissue. The device also comprises a control unit, which furnishes control signals to the light sources so that the light sources continuously emit light alternately, one or more dark phases can be inserted into this sequence, during which at least one light source does not emit any light. An evaluating device is connected to the output of the photodetector and furnishes, for at least one physiological variable to be measured, a displayable output signal to an interface that can be connected to the evaluating device.
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