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What is used as a photodetector in pulse oximetry?

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in Biomedical Instrumentation by (76.6k points)
What is used as a photodetector in pulse oximetry?

(a) Phototransistor

(b) Solar cell

(c) Photodiode

(d) Photographic plates

I have been asked this question in quiz.

My enquiry is from Pulse Oximeter topic in chapter Oximeters of Biomedical Instrumentation

1 Answer

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by (962k points)
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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