LED-transistor optical vascular measure: Replicability of a new device |
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Authors: | J Richard Jennings Larry Young Kay Brock |
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Institution: | 1. University of Pittsburgh, Pittsburgh, Pennsylvania
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Abstract: | We describe the use of a photo-optical device for the measurement of peripheral vascular activity, the Optek OPB707A, which we advocate to replace the now obsolete Sensor Technology STRT-850A. The Optek device provides a close coupling of light emitted and received through use of a GaAlAs light-emitting diode (LED). It also provides a photodarlington transistor as the receiver. The device should be used in a transmitted mode (e.g., LED illuminating tissue on volar surface of thumb and receiver on the thumbnail). Signal-to-noise characteristics and replicability of the signal from occasion to occasion are shown to be equal or superior to those of the earlier device. |
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