Apparatus and method for calibrating a photoplethysmograph

Details Apparatus and method for calibrating a photoplethysmograph Apparatus and method for calibrating a photoplethysmograph

1982-07-01

1984-07-10

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

128688, A61B 502, G01D 1800

Patent

active

044585187

ABSTRACT:
An apparatus for calibrating a photoplethysmograph system comprising a white card mounted in the cone of a speaker. The card is mounted a predetermined distance from a photoplethysmograph sensor for providing an output from the sensor corresponding to the DC or venous mode. An oscillation is provided for oscillating the white card at a frequency corresponding to the average heartbeat for producing on the output of the sensor a signal corresponding to an average heartbeat. By adjusting the gain of the photoplethysmograph apparatus to obtain a constant amplitude output from the system, a calibration signal is obtained.

REFERENCES:
patent: 2241190 (1941-05-01), Fenning
patent: 4164937 (1979-08-01), Spencer
patent: 4355903 (1982-10-01), Sandercock

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