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What is the wavelength of infrared LED in pulse oximetry?(a) 660 nm(b) 740 nm(c) 905 nm(d) 950 nmI got this question during an interview.My question is based upon Pulse Oximeter in chapter Oximeters of Biomedical Instrumentation

Answer» CORRECT answer is (c) 905 nm

For explanation I would say: 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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