The photoelectric sensors
The oxygen sensor is to detect the oxygen saturation of the important parts, and the damage is a direct result of the inaccurate detection or paralyzes the whole work. According to shape, 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 shape and type, the spo2 sensor
principle composition is the same, and they are composed 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 composed. 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 oximeter 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 oximeter is running, the time-sharing driving circuit make the two light emitting diodes emit light at a certain interval time respectively, to a lower duty cycle and received transmitted light intensity ratio according to the luminous intensity of the LED and photocell respectively calculated a660 and a940, and then combined with experimental 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.
The oximetery system block diagram
The pulse oximeter 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 between the IPC or PC, they have to be also connected through the level converter module, so that it is possible to conduct correct communications on the spo2 sensor cable
The principle of no damage oxygen saturation detection
No injury oxygen saturation measurements are based on the principle that measurement of the amount of arterial blood absorption of light varies with the arterial pulse. The basis of studies has shown that oxyhemoglobin and non oxyhemoglobin have different absorption rates of the different wavelengths of incident light. When monochromatic light irradiates in the human body vertically, the amount of light absorption of arterial blood arteries pulsate changes with light transmission area, and other organizations such as the skin, muscle, bone, and venous blood absorption of light are constant.
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