This method is limited to areas where light can easily penetrate, such as the fingertip or earlobe. Transmission types measure pulse waves by emitting red or infrared light from the body surface and detecting the change in blood flow during heart beats as a change in the amount of light transmitted through the body. Pulse sensors using the photoelectric pulse wave method are classified into 2 types depending on the measurement method: transmission and reflection. Pulse sensors use the photoelectric method.
A pulse wave is the change in the volume of a blood vessel that occurs when the heart pumps blood, and a detector that monitors this volume change is called a pulse sensor.įirst, there are four main ways to measure heart rate: electrocardiogram, photoelectric pulse wave, blood pressure measurement, and phonocardiography.
