Conclusions
The coefficient of effectiveness of collecting the useful signal A and, consequently, the change in the value of RF reflected from tissues of the BO substantially depend on the arrangement of the reflecting surface of these tissues relative to the PT used. An important factor in collecting the useful signal is the design of the PT itself, i.e., the dimensions of its components and their arrangement relative to one another. However, since the same PT, as a rule, is used in experimental investigations, the value of the RF reflected from the investigated tissues will depend practically only on the change in the position of the reflecting surface relative to the working surface of the PT, which the cardiovascular system introduces into the PPM (with consideration of the assumptions made). Depending on whether this system is normal or various pathologies are present in it, the value of the reflected RF will change.
As for the optimal selection of the real design of a PT, the results obtained in calculations by formula (16) make it possible to find the value of the coefficient of effectiveness of collecting useful information practically for all types of radiators and photodetectors, including fiber light pipes, being used in instruments (of the photoplethysmograph type).
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Additional information
Institute of Radio Engineering and Electronics, Academy of Sciences of the USSR, Moscow. Central Scientific-Research Institute of Stomatology, USSR Ministry of Health, Moscow. Translated from Meditsinskaya Tekhnika, No. 2, pp. 4–7, March–April, 1990.
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Gaiduk, M.I., Grigor'yants, V.V., Zaitsev, V.P. et al. Biophysical substantiation of photoplethysmography in reflected light. Biomed Eng 24, 45–50 (1990). https://doi.org/10.1007/BF00562866
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DOI: https://doi.org/10.1007/BF00562866