A versatile microwave plethysmograph for the monitoring of physiological parameters
Tóm tắt
A simple microwave technique for in vivo monitoring of human pulmonary and cardiac activity is here presented. The technique is based on detecting the changes in the modulation envelope of amplitude modulated waves passing through the human body. A simplified human chest model was developed, proving an unambiguous correlation between heart blood filling and microwave transmission through the chest. A prototype system for transmittance measurement was realized at the 868.5-MHz operating frequency, demonstrating the feasibility of a small, low cost microwave plethysmograph. In vivo measurements showed a good agreement with numerical simulations.
Từ khóa
#Condition monitoring #Biomedical monitoring #Humans #In vivo #Amplitude modulation #Microwave theory and techniques #Envelope detectors #Biological system modeling #Heart #BloodTài liệu tham khảo
10.1109/10.464380
10.1109/8.650074
10.1109/74.180638
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