HEMOGLOBIN DETECTION AND PHOTOPLETHYSMOGRAPHY USING SPECTRAL MODULATION
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United States of America Patent
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app pub date -
Jan 20, 2017
filing date -
Jul 30, 2014
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Abandoned
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Abstract
A hemoglobin detection apparatus comprises a spectrally tuneable emitter-detector unit, which is configured to emit or detect electromagnetic radiation spectrally selectively and periodically at different wavelengths covering a spectral modulation interval at a modulation frequency, and to provide a detector signal indicative of the detected electromagnetic radiation as a function of time. The apparatus further comprises a signal processing unit, which is configured to receive the detector signal and to provide an output signal, which is indicative of a contribution of at least one frequency component that forms a second or higher even harmonic of the modulation frequency to the detector signal. The hemoglobin detection apparatus can be used in photoplethysmography applications.
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