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What are the advantages of the dual-cylinder plate of the negative oxygen ion sensor over the parallel plate?
The negative oxygen ion sensor is a special instrument used to measure the concentration of negative oxygen ions in the air. It can not only accurately measure the concentration of air ions, distinguish the positive and negative polarities of ions, and can distinguish according to the difference of ion mobility The size of the measured ion. The negative oxygen ion sensor is mainly composed of polarization power supply, ion collector, micro current amplifier, air sampling module, data processing module and display control module, polarization power supply, ion collector and micro current signal Amplifiers are generally combined together, that is, the negative ion detection sensor we often say. With the cooperation of the polarized power module, the ion collector forms a uniform induction electric field on the surface of the collector. With the cooperation of the sampling module, the air in the environment will be Inhale into the sensor and pass through. At this time, the charged negative oxygen ions will deflect and hit the surface of the sensor under the action of the electric field force. In this process, the charge of the negative ions will change the uniform induction electric field on the surface of the sensor, resulting in The discharge signal, the discharge signal is recorded, and the current formed by these charges is measured by the micro-current signal amplifier. The data processing module calculates the measured negative ion concentration according to the collected current. We can use the instrument display screen to real-time Know the measured negative ion concentration data. Among all the components of the instrument, the sensor is the core and a high-tech module. A good sensor module can effectively improve the accuracy and stability of the measurement. There are currently two main types of negative oxygen ion sensors: parallel plate type and condenser tube type. Among them, the parallel electric plate negative ion sensor is a commonly used sensor for negative oxygen ions in the middle and low-end air. The detection principle is: the pressurizing module applies a constant voltage to a set of mutually equal polarized plates to form a constant electric field, and then through the fan at the rear of the plate, the air is sucked in. When the air flows between the plates, the positive in the air is , Under the action of the electric field force, the negative ions deflection and hit the surface of the plate and generate a discharge signal. According to the strength of the exchange signal, the number of ions collected can be converted, and the positive and negative electrodes between the plates can be adjusted. Distinguish the polarity of ions. Condensing tube type anion sensor, also called double cylindrical shaft type. Compared with the parallel plate type sensor, it is much better. It is a mature and complex negative ion sensor. At present, the excellent air ion sensor basically adopts the sensor of this structure. The overall structure of the double cylindrical shaft type is composed of 3 concentric cylinders. The outer cylinder and the inner shaft are electrodes and a constant voltage is applied. There is an air suction fan behind the cylinder. When the fan is started, the air is sucked in through the cylinder. When the positive and negative ions in the air flow through the cylinder, they will be attracted to the cylinders of different polarities due to the torsion force formed by the cylinder voltage and discharge. These discharge signals It is recorded to calculate the number of positive and negative oxygen ions in the air. In the industrial negative oxygen ion detection, the parallel plate negative ion sensor is technically mature, and the cost is relatively low, but it is easily affected by the external environment and requires daily maintenance. In addition, the weakness of this structure can easily lead to the edge of electrolysis. Effect, it is easy to cause turbulence of airflow, which causes a large deviation of the detection result. This kind of sensor is more suitable for detecting negative ions with medium and large particle size. The dual-cylinder-axis negative ion sensor is much more advanced in technology, and the overall performance is also much better. However, due to the complicated internal structure and control, the cost is high. This structure can effectively solve the inherent electrolytic edge effect of the parallel plate structure. At the same time, the structure of the cylinder itself and the special air intake method can maintain the smoothness of the air flow, and the detection accuracy of the number and size of ions is greatly improved. Therefore, the negative ion sensor with the condenser tube structure is more suitable for medium and small particle diameters. Negative ion detection.
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