Abstract
Background and Objectives: Due to the development of methods for analyzing signals of autonomous blood circulation control, cardiovascular system disorders can be diagnosed today in the early stages. It is promising to use specialized devices for personalized diagnosis of the cardiovascular system and monitoring its state. Research on autonomous blood circulation control systems is a complex problem both from the point of view of physiology and radiophysics. Its solution requires the development of methods and specialized devices for the analysis and registration of signals from the cardiovascular system. Therefore the object of research is the development of a photoplethysmogram sensor with a digital communication channel with a band of 0.05-30 Hz, recording the signals from the autonomous blood circulation monitoring system. Materials and Methods: To compare the level of noise and nonlinear distortions in the center of the frequency range of interest to us (at a frequency of 0.1 Hz), the power spectra of the signals were analyzed, and the coherence function was also calculated. Results: a prototype of a device for recording and analyzing a photoplethysmogram signal was developed and implemented, which makes it possible to register the signals from the circuits of autonomous blood circulation regulation. A comparative analysis of the developed device with a serial analog sensor was carried out, which demonstrated the advantages of the developed device. Conclusion: The developed broadband digital sensor can be used in wearable devices to diagnose the functional state of the cardiovascular system based on the analysis of synchronization between the circuits of autonomous regulation of blood circulation.
Highlights
Background and ObjectivesDue to the development of methods for analyzing signals of autonomous blood circulation control, cardiovascular system disorders can be diagnosed today in the early stages
Its solution requires the development of methods and specialized devices for the analysis and registration of signals from the cardiovascular system
The object of research is the development of a photoplethysmogram sensor with a digital communication channel with a band of 0.05-30 Hz, recording the signals from the autonomous blood circulation monitoring system
Summary
Нами был разработан и реализован прототип устройства для регистрации и анализа сигнала кровенаполнения сосудов пальца. 1. Устройство содержит следующие основные элементы: разработанный нами датчик ФПГ, плата управления и сбора данных на основе микроконтроллера ARM CortexTM-M3, цифровые интерфейсы для передачи данных от датчика в блок управления, а также от этого блока в персональный компьютер (ПК). Электрическая принципиальная схема датчика представлена на рис. Электрическая принципиальная схема блока управления и сбора данных представлена на рис. 2. Электрическая принципиальная схема устройства: а – датчик ФПГ, б – блок приема, обработки и передачи сигнала с датчика. Также в схему блока управления и сбора данных включены индикационные светодиоды VD2 и VD3, стабилизатор напряжения U1, кварцевый резонатор QZ1, кнопка перезагрузки SW1 и разъем USB для подключения прибора к компьютеру. 3. Прототип разработанного устройства: а – фотография датчика с двух сторон монтажа, б – блок управления и сбора данных (цвет online)
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