Abstract
An instrument for monitoring backscattered light from living tissue, in two wavelengths, is described. The backscattered light data is used for thein vivo determination of the blood's relative oxygen saturation. The instrument contains a small optical transducer, 0·75 in. (19 mm) in diameter, with red and infra-red light emitting diodes (L.E.D.'s) and a photodetector. This small and easy to apply transducer allows monitoring the reflectance in various locations on the body. The light emitting diodes are controlled by a line synchronized pulse generator which alternatively drives the L.E.D.'s. The detection is accomplished synchronously and the photodetector's output is separated into red and infra-red channels, by means of a chopper and hold cicuits. This information is currently processed by a computer, with the intention of developing an optimal compact analogue processor.
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