The photoelectric sensorsThe oxygen sensor is to detect the oxygen saturation of the important parts Nino Niederreiter Jersey , and the damage is a direct result of the inaurate detection or paralyzes the whole work. Aording to ape, the oxygen sensor can be mainly classified to dwelling, earlobe, parcels and adhesion type. And it can be divided into adult and children, infantile several uses. Regardless of the ape and type, the spo2 sensor principle position is the sa, and they are posed of a light emitting device and a receiving device. The light emitting device consists of the wavelength of 660nm (650nm) red light and the wavelength of 940nm (910nm) infrared light emitting tube posed. Most of the photosensitive receiving device receiving area, high sensitivity, low dark current, low noise, the PIN-type photodiode, it receives incident light signals into electrical signals. The newly developed pulse oxiter takes the finger sensor probe. Probe sets on the fingertip in the process of using. Two juxtaposed light emitting diodes are fixed to the sleeve wall which emission wavelengths are 660nm red light and 940nm infrared light, respectively. The lower wall is a photosensitive reception device, and it converts the red and infrared light transmitting through the finger into an electrical signal. When the oxiter is running, the ti-aring driving circuit make the o light emitting diodes emit light at a certain interval ti respectively Niklas Backstrom Jersey , to a lower duty cycle and received transmitted light intensity ratio aording to the luminous intensity of the LED and photocell respectively calculated a660 and a940, and then bined with experintal calibration coefficients A and B, substituting into the foregoing formula, it can be regarded as the values of the oxygen saturation of the absorption rate of the whole blood.spo2 sensorThe oxitery system block diagramThe pulse oxiter usually consists of the oxygen saturation detection module, IPC or PC, oxygen detection probe (usually the finger), and so on. If we take the system built by the oxygen saturation detection module, due to the different module voltage level beeen the IPC or PC, they have to be also connected through the level converter module, so that it is possible to conduct correct munications on the spo2 sensors.The principle of no damage oxygen saturation detectionNo injury oxygen saturation asurents are based on the principle that asurent of the amount of arterial blood absorption of light varies with the arterial pulse. The basis of studies has own that oxyhemoglobin and non oxyhemoglobin have different absorption rates of the different wavelengths of incident light. 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