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<p>With the development and implementation of modern optoelectronic technologies in various branches of medicine, it is crucial to ensure efficient operation of devices for non-invasive spectrophotometric diagnostics of physiological parameters under exposure to specific external factors, such as ambient light from natural and artificial sources. This paper presents a&#xa0;mathematical model of fixed-frequency ambient light interference, which can be viewed as additive interference to the useful photoplethysmographic signal of a&#xa0;pulse oximeter channel. It is shown that when using photoplethysmographic methods for studying oxygen status parameters, the intensity of optical radiation transmitted through biological tissue depends on the level of arterial blood saturation with oxygen. A&#xa0;mathematical model of the photoplethysmographic signal has been developed that makes it possible to account for the pulse wave parameters, such as frequencies of the first and second harmonics of arterial blood pulsation, as well as respiratory contractions. The ambient light interference level is normalized to the photoplethysmographic signal level using the signal-to-noise ratio (SNR). It was found that at SNRs of 10, 5, and 1, the ratios of the constant and variable components of the photoplethysmographic signal change by an average of 6.7, 11.4, and 15.7%, respectively, compared to no additive interference. The effect of varying levels of ambient light on the quality of fractional blood saturation assessment was studied, showing the relative errors of 3.676, 6.115, and 8.077% for the respective SNR values of 10, 5, and 1. A&#xa0;physical experiment was conducted involving 30&#xa0;subjects to determine the effect of ambient illumination on the quality of fractional blood saturation level assessment by a&#xa0;multiwave pulse oximeter. The experimental data confirmed the simulation results SNRs of&#xa0;10 and 5. The obtained results can be used in the design and development of non-invasive spectrophotometric diagnostic devices to improve their performance under destabilizing conditions.</p>

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The impact of ambient light on the error of estimating the level of fractional blood saturation using a multiwave pulse oximeter

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • D. S. Koptev,
  • M. O. Revyakina

摘要

With the development and implementation of modern optoelectronic technologies in various branches of medicine, it is crucial to ensure efficient operation of devices for non-invasive spectrophotometric diagnostics of physiological parameters under exposure to specific external factors, such as ambient light from natural and artificial sources. This paper presents a mathematical model of fixed-frequency ambient light interference, which can be viewed as additive interference to the useful photoplethysmographic signal of a pulse oximeter channel. It is shown that when using photoplethysmographic methods for studying oxygen status parameters, the intensity of optical radiation transmitted through biological tissue depends on the level of arterial blood saturation with oxygen. A mathematical model of the photoplethysmographic signal has been developed that makes it possible to account for the pulse wave parameters, such as frequencies of the first and second harmonics of arterial blood pulsation, as well as respiratory contractions. The ambient light interference level is normalized to the photoplethysmographic signal level using the signal-to-noise ratio (SNR). It was found that at SNRs of 10, 5, and 1, the ratios of the constant and variable components of the photoplethysmographic signal change by an average of 6.7, 11.4, and 15.7%, respectively, compared to no additive interference. The effect of varying levels of ambient light on the quality of fractional blood saturation assessment was studied, showing the relative errors of 3.676, 6.115, and 8.077% for the respective SNR values of 10, 5, and 1. A physical experiment was conducted involving 30 subjects to determine the effect of ambient illumination on the quality of fractional blood saturation level assessment by a multiwave pulse oximeter. The experimental data confirmed the simulation results SNRs of 10 and 5. The obtained results can be used in the design and development of non-invasive spectrophotometric diagnostic devices to improve their performance under destabilizing conditions.