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  Indian J Med Microbiol
 

Figure 1: Working of a pulse oximeter. (a) LED-emitting red light at 660 nm. (b) LED emitting infrared light at 940 nm. (c) Photodetector. (d) Pulse oximeter monitor. (e) Pulse oximeter sensor. (f) Custom-made pulse oximeter sensor holder. HbO2, oxygenated hemoglobin; HbR, deoxygenated hemoglobin; SpO2, oxygen saturation of arterial blood

Figure 1: Working of a pulse oximeter. (a) LED-emitting red light at 660 nm. (b) LED emitting infrared light at 940 nm. (c) Photodetector. (d) Pulse oximeter monitor. (e) Pulse oximeter sensor. (f) Custom-made pulse oximeter sensor holder. HbO2, oxygenated hemoglobin; HbR, deoxygenated hemoglobin; SpO2, oxygen saturation of arterial blood