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People breathe air every day, because the air contains oxygen, which is the basis to maintain human life. The reduction blood hemoglobin in human body combines with the inhaled oxygen in the lungs to form oxygenated hemoglobin, and the oxygen inhaled by the body also dissolves in the plasma to maintain the metabolism of tissues and cells. The blood oxygen sensor can measure the percentage of hemoglobin in the blood in the human body. Below introduces the technical principles and functions of the blood oxygen sensor.
The light-emitting diode in the blood oxygen sensor emits red and infrared lights that pass through human tissue, and the sensor is responsible for measuring the amount of red and infrared light received by the detector and calculating the amount of light absorbed. Due to pulse reasons, the amount of light absorbed by arterial blood will vary greatly in a short period of time, and arterial blood is usually the only abruptly variable light absorption component in a short period of time, which can be isolated from other components. The amount of light received by the detector can indicate the oxygen saturation bound to blood hemoglobin in the blood. By comparing the amount of red and infrared light received, the instrument can calculate the blood oxygen reading.
The blood oxygen sensor can measure the blood oxygen saturation in the human body, which refers to the percentage of oxygenated hemoglobin in the blood in the human body. Blood oxygen saturation is actually an important indicator to measure patients' conditions. The blood oxygen sensor comes in various shapes, including finger-type, earlobe-type, and adhesive-type. Regardless of the shape, the core of the blood oxygen sensor is the same, consisting of light emitting components and receiving components.
The light emitting component of the blood oxygen sensor is composed of infrared emission tubes, and the photoelectric receiver of the blood oxygen sensor adopts a PIN-type photoelectric diode, which converts the received incident light signal into an electrical signal. Through the use of advanced technology, the receiving area of the sensor becomes larger, with high sensitivity, low dark current, and low noise. The driving mode of the blood oxygen sensor actually uses two light emitting diodes and one photoelectric receiver to implement the dual-beam measurement method to measure blood oxygen saturation. By using this pulse driving mode, not only can the instantaneous light intensity be increased and energy consumption reduced, but also the service life can be extended. The blood oxygen sensor also adopts an optical measurement method, which is a continuous non-invasive blood oxygen measurement method that does not cause any pain or side effects to the human body.