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What is used as a photodetector in pulse oximetry?(a) Phototransistor(b) Solar cell(c) Photodiode(d) Photographic platesI have been asked this question in quiz.My enquiry is from Pulse Oximeter topic in chapter Oximeters of Biomedical Instrumentation

Answer»

Correct answer is (c) Photodiode

Explanation: Pulse oximetry is a particularly CONVENIENT noninvasive measurement method. Typically it utilizes a PAIR of SMALL light-emitting diodes (LEDs) facing a photodiode through a translucent part of the PATIENT’s body, usually a fingertip or an earlobe. One LED is red, with a wavelength of 660 nm, and the other is infrared, 905, 910, or 940 nm.



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