MICROWAVE PHOTONIC ADDRESSED MULTI-SENSOR SYSTEM FOR BALLISTOCARDIOGRAM FORMING IN A STATIC POSITION OF AN ATHLETE

Abstract

Ballistocardiography (BCG) is a non-invasive method used to create a graphical representation of body movements that occur as a result of blood spreading in the vascular system during each cardiac cycle. The analysis of the recorded ballistic curves – ballistocardiograms (BCG) – demonstrated their usefulness in identifying individuals with abnormal circulatory patterns or heart diseases. Among the known sensors for BCG formation, fiber optic (FOS) ones have the advantages of high sensitivity, safety and immunity to electromagnetic interference. FOSs based on micro- and macro-bending, interferometric and fiber Bragg technologies used for BCG measurement are usually placed above or under a mattress or pillow. When a weak cardiopulmonary vibration signal impacts the sensor, the characteristic parameters of the radiation probing it, such as intensity, phase or wavelength, will change accordingly. The use of fiber Bragg gratings (FBG) for a static position of an athlete is optimal. This article discusses the principles of constructing a microwave photonic system for addressable multi-sensor BCG formation in a static position of an athlete, related to the field of research and development in sports engineering, and by purpose - to the rehabilitation of athletes. To provide a sign of addressability and the possibility of using radio-photonic technologies, the FBG as the basic sensor of the system is replaced by an addressable fiber Bragg structure. A structural diagram of the radio-photonic system of addressable multisensory formation of the BCG in the static position of the athlete and the element base for its creation are presented.