An ionization sensor based on a micro-gap polarization structure to construct a discharge electric field

Abstract

The invention discloses an ionizing gas sensor based on a discharge electric field with a micro-gap polarization structure. The ionizing gas sensor comprises an external circuit electrode couple, the polarization structure and a material with a large length-diameter ratio, wherein the polarization structure is arranged at the area between the external circuit electrode couple; and the material with large length-diameter ratio is at least arranged on one of the polarization structure and the external circuit electrode couple. When the ionizing gas sensor works, lower voltage is only needed to be loaded onto electrodes of an external circuit, and the electric field which is enough to ionize target gas molecules is generated between the polarization structure and the electrodes of the external circuit by the polarization action of the polarization structure, so that the working voltage of the sensor is effectively reduced. Compared with the micro-gap structure between the external circuit electrode couple in the prior art, the ionizing gas sensor effectively solves the problems of instability and failure caused by contaminants such as dust, fiber and the like which fall into a micro-gap, and the signal to noise ratio and the sensitiveness are improved.

Description

technical field [0001] The invention relates to an ionization sensor, in particular to an ionization sensor which constructs a discharge electric field based on a micro-gap polarization structure. Background technique [0002] Ionization gas sensor realizes sensing through the gas electronic signal generated by the ionization of gas molecules. Its main advantages are fast response, short response time and wide sensitive range. It is an important supplement to other types of sensors. It is used in dangerous gas alarm, It has important application prospects in many fields such as toxic and harmful gas monitoring. [0003] However, in order to ionize gas molecules, a high electric field needs to be applied, thus, high voltage operation becomes a common bottleneck problem for this type of sensor. [0004] A literature search of the prior art found that in the published technical literature, in order to solve this bottleneck problem, it is mainly to cover the electrode surface w...

AI Technical Summary

Problems solved by technology

Its technical limitations are: first, the Pylux glass used as electrode gap adjustment is as thick as 500 microns, and the working voltage is too high; second, the micropore air intake sampling is still a small air intake area sampling

[0012] Therefore, the micron-scale small-scale discharge gap technology solution brings the problems of narrow sampling space, excessively high random component of the signal, and decreased signal-to-noise ratio

At the same time, it also makes it difficult for materials with large aspect ratios to be placed on electrode pairs with small gaps while avoiding short circuits.

More importantly, this electrode structure is easily contaminated by suspended matter such as dust or fibers in the air, resulting in device failure, which greatly limits its application fields.

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