Basic study to verify possibility for detection of human cardiopulmonary activity in sediment using current‐induced magnetic modulation spectroscopy

Abstract

AbstractWe have suggested the current‐induced magnetic modulation spectroscopy (CIMMS) to detect human cardiopulmonary activity in sediment for lifesaving. Initially, a Finite Element (FE) model of human in sediment was developed to simulate impedance change by human cardiopulmonary activity and an optimal electrode arrangement was estimated to detect the activity at burial distance of 47 , 97 , and 147 mm. The estimated electrode arrangement was 427 mm apart for current injection and 305 mm apart for voltage difference detection. The impedance changes at burial distance of 47 mm, 97 mm and 147 mm were 0.0635%, 0.0432%, and 0.0278% caused by respiration and were 0.0006%, 0.0004%, and 0.0003% caused by pulsation, respectively. Secondly, cardiopulmonary activity of a normal male subject was measured with an electrode contactless electrical impedance spectroscopy (EIS) device using the estimated optimal electrode arrangement. Respiration and pulsation at the distance of 50 mm had shown good agreement between a medical equipment and impedance measurement device. However, the accuracy was worse significantly at the distance of 100 mm and 150 mm gradually. Finally, we calculated the sensitivity difference between EIS and CIMMS and concluded that it would be possible to detect human cardiopulmonary activity in sediment when we use the CIMMS.