Study on the Optimal Method for Photoplethysmograph Measurement at radial Artery

An electronic circuit for detecting photoplethy-smograph (PGp) at radial artery is developed, and experiment study on the optimal method for PGp measurement at the radial artery using local pressurizing cuff is carried out. Also, amplitudes of the arterial volume pulsation detected under the same cuff pressure are used as the evaluation standard, the optimal measurement position, the combination of photoelectric sensor and the method for PGp measurement are discussed and experimented. Experimental results show that the bigger PGp can be detected under the condition that the photoelectric sensor is located at 20mm position in wrist, the distance between centerlines of light-emitting diode (LED) and photodiode (PD) is set to 7mm, the photoelectric sensor is set in the vertical placement, and LED is just located on the radial artery. From the study, the optimal method for PGp measurement at the radial artery is determined.