METHODS FOR OBTAINING INFORMATION FOR BIOMEDICAL MONITORING OF HEART RATE USING BUILT-IN SMARTPHONE SENSORS
Abstract
Non-invasive monitoring is a promising direction in medicine for determining biometric indicators. The purpose of the study is to review modern non-invasive methods for determining such biometric indicators as heart rate. The problems of existing solutions related to calculation formulas, as well as those related to testing are shown. Nowadays, a smartphone is an integral part of any person's life. With the help of these devices, users can perform almost any activity from the comfort of their homes, such as shopping, watching movies and entertainment, making their lives much easier, more convenient and efficient. In addition, today's smartphones have extensive telecommunication capabilities, allowing groups of people to communicate frequently in real time. With the COVID-19 pandemic, the need for health monitoring has become relevant, as well as the need to constantly monitor the biomedical indicators of employees who are on the job. One of the most important indicators is the heart rate, the analysis of this indicator allows to characterize the performance of the most important cardiovascular system. This review discusses techniques for monitoring heart rate based on methods that can be utilized on smartphones, using sensors that all modern smartphones are equipped with. The basic approach that can be applied in smartphones to detect heart rate is to use a light source and a light-sensitive device that receives light passing through capillaries, most commonly the finger of the person whose heart rate is being measured. The difference between the approaches lies in the hardware - what light source is used and what is used as a receiver of reflected light. As a light source can be used LED, in smartphones it is powerful LEDs, which are used in the photoflash, as a receiver or photodiode or video camera. In terms of processing the received signal there are several approaches in this review they are considered.
