Use of a singlemode multimode singlemode fiber structure for apex cardiography monitoring

A cardiac apex impulse sensing based on a singlemode-multimode-singlemode (SMS) fiber structure has been demonstrated experimentally to monitor heart pulse in the human body. The sensor was placed onto the sample’s skin at the precordium area. By detecting the power output variation due to vibration applied to the SMS fiber structure by cardiac apex impulse, the heart condition could be observed. The pulse wave signal pattern which was obtained had the similar signal pattern with the apex cardiography reference signal graph. The proposed method can be used to measure vital signs with several advantages, such as real-time and accuracy, high sensitivity, reproducible, low cost and convenient operation.