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Proceedings Article

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

[+] Author Affiliations
Haekan Ugnell, P. Ake Oberg

Linkoepings Univ. (Sweden)

Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, 89 (February 10, 1995); doi:10.1117/12.201233
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From Conference Volume 2331

  • Medical Sensors II and Fiber Optic Sensors
  • Anna M. Verga Scheggi; Francesco Baldini; Pierre R. Coulet; Otto S. Wolfbeis
  • Lille, France | September 06, 1994

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).

© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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, 89 (February 10, 1995); doi:10.1117/12.201233; http://dx.doi.org/10.1117/12.201233


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