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The detected signals are processed in the form of photo – plethysmographs to determine ___________

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The detected signals are processed in the form of photo – plethysmographs to determine ___________

(a) SiO2

(b) SO2

(c) CO2

(d) TiO2

This question was posed to me in class test.

This question is from Electromyograph (EMG) in division Biomedical Recorders of Biomedical Instrumentation

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The correct answer is (b) SO2

For explanation: A pair of red and infrared light emitting diodes is used for the light source, with peak emission wavelengths of 665 nm (red) and 935 nm (infrared). The reflected light from the skin at these two wavelengths is detected by a silicon diode. These detected signals are processed in the form of photo-plethysmographs to determine So2.

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