Time variable photoplethysmographic signal: its dependence on light wavelength and sample volume

Haekan Ugnell; P. Ake Oberg

doi:10.1117/12.201233

10 February 1995 Time variable photoplethysmographic signal: its dependence on light wavelength and sample volume

Haekan Ugnell, P. Ake Oberg

Proceedings Volume 2331, Medical Sensors II and Fiber Optic Sensors; (1995) https://doi.org/10.1117/12.201233
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

The photoplethysmographic signal (PPG) from forearm skin and the ECG were recorded simultaneously from healthy subjects. The optical signal was derived with a fiber-optic probe which consisted of 61 fiber pairs. The peak-to-peak averaged AC-signal was calculated. The dependency of this signal on light wavelength and on sample volume was studied. The light intensities used at 560 nm were 0.015 and 0.029 mWmm^-2 and at 940 nm we used 0.029, 1.37 and 2.77 mWmm^-2. A theoretical model for calculation of the sample volumes was also developed. The amplitude of the AC-signal at 560 nm is larger than at 940 nm at the same intensity (0.029 mWmm^-2). At 560 nm and small sample volumes (7 fiber pairs) the amplitude did not increase with increased intensity. At 940 nm using 1.37 and 2.77 mWmm^-2 the AC-signal increased with the number of fiber pairs (volume).

Citation Download Citation

Haekan Ugnell and P. Ake Oberg "Time variable photoplethysmographic signal: its dependence on light wavelength and sample volume", Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, (10 February 1995); https://doi.org/10.1117/12.201233

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