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Proceedings Paper

Time variable photoplethysmographic signal: its dependence on light wavelength and sample volume
Author(s): Haekan Ugnell; P. Ake Oberg
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Paper 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).

Paper Details

Date Published: 10 February 1995
PDF: 9 pages
Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, (10 February 1995); doi: 10.1117/12.201233
Show Author Affiliations
Haekan Ugnell, Linkoepings Univ. (Sweden)
P. Ake Oberg, Linkoepings Univ. (Sweden)


Published in SPIE Proceedings Vol. 2331:
Medical Sensors II and Fiber Optic Sensors

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