The Design of a Photoelectric Sensor with Low Noise for Detecting Pulse Wave

The aim is to develop a photoelectric sensor for physiological signals. The sensor detects the change in light intensity after light passes through fingertip capillaries, converts the light signal into an electrical signal, and then processes it through I/V conversion, amplification, and filtering. As a result, a clear and stable fingertip volume pulse wave is obtained. The sensor with a high signal - to - noise ratio can be used for clinical monitoring and physiological signal analysis4.