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Comparison of optical fibre sensor with commercial pulse oximeter (a) During normal breathing both devices record stable values with the absolute error 0.443 ± 0.466%. (b) SpO2 test result with a desaturation event. Phase 1: Breathe normally (80 s). Phase 2: Breathe out (14 s). Phase 3: Hold breath (19 s). Phase 4: Breathe normally (66 s). Both devices identify the desaturation event with the absolute error 1.16 ± 0.423% across the trace.
