Being a kind of near-infrared blood detecting technology

although the photoelectric pulse sensor takes advantage of rich payload of effective information

which is able to provide effective sampling data to dynamic spectral detection theory.But its practical application is limited by individual diversity.In order to overcome the detecting problem of different thickness of the finger-sides

the relationship between the pressure and the DC component and AC component in test result is analyzed.Through testing experiments of different finger thickness

the existence of an optimal detection region which allows the pulse wave detected by the sensor in the most ideal state is pointed out.