Photoionization sensor for distinguishing gas types

Abstract

The invention discloses a photoionization sensor for distinguishing gas types. The photoionization sensor is used for improving the classification capacity of the photoionization sensor when the photoionization sensor detects gases with different ionization energies, and comprises an ultraviolet lamp module, a sensor main body, ion current receiving electrode pairs, amplifying circuits and an output module, wherein a gas circulation area and an information processing area are arranged on the sensor main body, the ultraviolet lamp module is provided with at least two ultraviolet light windows, the spectrum components of ultraviolet light emitted by the ultraviolet light windows are different, the ultraviolet lamp module is arranged in the gas circulation area, the ultraviolet light windows are used for emitting ultraviolet light after the ultraviolet lamp module generates an ultraviolet light source, at least two ion current receiving electrode pairs are mounted in the gas circulation area, at least two amplifying circuits are mounted in the information processing area, the ion current receiving electrode pairs are connected with the amplifying circuits, and the output module is arranged in the information processing area and is connected with the amplifying circuits.

Description

technical field [0001] The embodiments of the present application relate to the detection field, and in particular to a photoionization sensor for distinguishing gas types. Background technique [0002] The photoionization sensor is an important sensor for the detection of gaseous substances. Its working principle is: the gas to be measured absorbs the photons emitted by the ultraviolet lamp and is ionized into positive ions and electrons. The successful ionization of the gas molecules requires that the energy of the ultraviolet photons (calculated according to E=hν) be greater than the ionization energy of the gas molecules. Under the action of external electrodes, ions move in space to form a weak current and be collected. This weak current is photoionization current. The resulting ionization current is generally set by 10 9 The Ω-level large resistance amplification circuit is converted into a voltage value that is easy to measure, and finally the logic analysis and cal...

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Problems solved by technology

[0005] However, in the method of adding ultraviolet lamp modules, the gas to be measured is affected by two ultraviolet lamp modules separately, that is, the gas to be measured does not share the same ultraviolet light source, and the gas concentration and purity of these ultraviolet light sources are uncontrollable. During long-term use, the attenuation speed of light intensity may also be different. During use, the accuracy of analytical data for different gas types will be reduced, causing traditional photoionization sensors to detect gases with different ionization energies. The ability to classify is reduced when

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