Working principle

Originally a blood oxygen saturation meter developed by Millikan in the 1940 of the 20th century. Monitorarterialoxygen-carryinghemoglobinand carries oxygen-carrying hemoglobin rate. Typical blood oxygen saturation meter with twoLEDs. The two LEDs for patients to be tested parts, usually a fingertip or earlobe. Release a diode wavelength of 660nmof light, one free 905,910 or 940 nm. Oxygenated hemoglobin on two wavelengths of the absorption rate and oxygen varied widely. Using this property, you can calculate the percentage of hemoglobin of two kinds of. Testing process usually does not require drawing blood from patients. Usual Oximeter also can display the patient's pulse. According to Beer-Lambert law, ratio R/IR and artery blood oxygen saturated degrees (SaO2) of function relationship should for linear relationship, but due to bio organization is a strong scattering, and weak absorption, and each to heterosexual of complex optical system (2~4), not completely meet classic of Beer-Lambert law, thus led to has expression red and infrared light sucking photometric relative changes measurement value (R/IR value), and artery blood oxygen saturated degrees (SaO2) Zhijian relationship of mathematics model established difficult. Only through the experimental method to determine the relationship between R/IR and SaO2, namely the calibration curve. Pulse Oximeter manufacturer with the most experimental method to obtain empirical calibration curve labeled with the finished products manufactured prior to booking.