PHOTOPLETHYSMOGRAPH Russian patent published in 1996 - IPC

Abstract RU 2054884 C1

FIELD: medical engineering. SUBSTANCE: device has light sensor with photodetector 1, alternating current amplifier 3, demodulator 4, direct current amplifier 6. The device has newly introduced limiting amplifier 2 having controllable limit threshold. The direct current amplifier input is connected to control input of limiting amplifier 2. Limiting amplifier 2 is mounted between photodetector 1 and alternating current amplifier 3. Photodetector 1 has logarithmic characteristic curve. EFFECT: enhanced reliability; noise immunity. 3 dwg

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RU 2 054 884 C1

Authors

Stromakov A.P.

Chernov D.A.

Antropov G.M.

Arnautov L.N.

Zakharkin N.S.

Churbakov A.V.

Dates

1996-02-27—Published

1990-01-02—Filed