Frequency conversion type oxygen sensor

Abstract

The invention discloses a new no-hole frequency oxygen sensor which can combine sensitive cells and oxygen pump cells and convert the measurement of oxygen concentration into the measurement of time t. Wherein, the invention comprises the sensitive cells, the oxygen pump cells and a glass capsulation glaze which is a cylinder body with a through hole; along the mouth of one end of the glass capsulation glaze is connected with the sensitive cells; along the mouth of the other end of the glass capsulation glaze is connected with the oxygen pump cells; the sensitive cells, the oxygen pump cells and the glass capsulation glaze are enclosed to form an enclosed air cavity; the inner surface of the sensitive cells is distributed with inner electrodes of the sensitive cells; the outer surface of the sensitive cells is distributed with outer electrodes of the sensitive cells; the inner surface of the oxygen pump cells is distributed with inner electrodes of the oxygen pump cells; and the outersurface of the oxygen pump cells is distributed with outer electrodes of the oxygen pump cells. As the measurement method is novel and has simple technics, the invention is easily to realize large-scale industrial production, thus has wide application.

Description

technical field [0001] The invention relates to a sensor for measuring oxygen concentration in the environment, in particular to a variable frequency oxygen sensor. Background technique [0002] The measurement and control of oxygen concentration plays an important role in various industrial fields. People use YSZ solid electrolyte with good oxygen ion conductivity to make concentration voltage type and limit current type oxygen sensors. Among them, the limiting current oxygen sensor has been widely used because of its high measurement accuracy and no need for reference gas. At present, the working mechanism of the limiting current oxygen sensor includes small hole diffusion type, porous diffusion type and dense diffusion barrier layer type. However, these types of sensors also have some shortcomings and deficiencies. For example, the small hole type limit current oxygen sensor is easy to block and deform the small hole when used for a long time, the porosity of the porous ...

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Problems solved by technology

However, these types of sensors also have some shortcomings and deficiencies. For example, the small hole type limit current oxygen sensor is easy to block and deform the small hole when used for a long time, the porosity of the porous type limit current oxygen sensor is difficult to control, and the sensor consistency is poor. , and the air permeability of porous pores will also change after long-term use, and the dense diffusion barrier layer type also has the disadvantage of being too sensitive to temperature, which will cause a significant drop in the test accuracy of the sensor; and the above sensors are all based on the electrical signal The indirect measurement of oxygen concentration is realized on the basis of the measurement

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