Measurement Signal Analysis at Each Pulsation Point of Living Body by FBG Sensor

This paper describes the waveform signals measured by using fiber Bragg grating (FBG) sensors, which are optical fiber type strain sensors, installing at the pulsation points of the wrist, elbow, neck, and ankle of a living body. The waveform of signals measured on the left and right half body at each pulsation point had almost the same waveform. However, the waveform of signal at each pulsation point was very different. As the diameter of artery thin between from the elbow and wrist, the peak value of the waveform of signal was larger and the half width of the peak was smaller, indicating "peaking phenomenon" in the blood flow. Many smaller peaks appeared in the signal waveform at the neck than other signals. There was only one large peak in signal waveform at the ankle. These causes were presumed to be affected by the distance from the heart to each pulsation point. Therefore, there was a difference in the amount of information of the signal indicating the heart movement at each pulsation point, and it was shown that there was an optimal measurement part depending on the type of vital signs such as pulse and blood pressure.