Photoionization sensor for detecting gas concentration

A technology for detecting gases and sensors, which is applied in the field of detection, can solve the problems of reducing detection accuracy, different light intensity attenuation speeds, differences in concentration and purity, etc., and achieve the effect of improving detection accuracy and increasing the total reliable detection range

Pending Publication Date: 2021-05-28
BEIJING HTNOVA DETECTION TECH CO LTD
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Problems solved by technology

[0004] However, in the method of adding an ultraviolet lamp module, when the two ultraviolet lamp modules are working, the ultraviolet lamp modules emit light to ionize the gas to be measured respectively, that is, the gas to be measured does not share the same ultraviolet light source for ionization, and the emitted light from the two ultraviolet lamp

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  • Photoionization sensor for detecting gas concentration
  • Photoionization sensor for detecting gas concentration
  • Photoionization sensor for detecting gas concentration

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solution in the application with reference to the accompanying drawings in the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0047] In the embodiment of the present application, it involves a photoionization sensor. The photoionization sensor is a sensor with extremely high sensitivity and wide application, which can detect volatile organic compounds and other toxic gases with a concentration of about 10ppb to about 10000ppm. Many harmful substances contain volatile organic compounds, and photoionization sensors can detect volatile organic compounds efficiently and reliably.

[0048] The gas to be measured absorbs the photons emit...

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Abstract

The invention discloses a photoionization sensor for detecting gas concentration. The photoionization sensor is used for improving the detection accuracy when the concentration detection range of the photoionization sensor is expanded. The photoionization sensor 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 windows, and is arranged in the gas circulation area, the ultraviolet 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 installed in the information processing area, resistors in the amplifying circuits are different in size, 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 field of detection, and in particular to a photoionization sensor for detecting gas concentration. Background technique [0002] Photoionization sensor is an important sensor for detecting gaseous substances at present. Its working principle is: the gas to be measured absorbs the photons emitted by the ultraviolet lamp that are higher than the ionization energy of the gas molecules to be measured, and is ionized into positive ions and electrons. Under the action of an external electrode, the ions move in space to form a weak current and are collected. The weak current is the photoionization current. The resulting photoionization current is generally set by setting 10 9 The amplifying circuit of the large resistance of the Ω level is converted into a voltage value for easy measurement. Since the concentration of the gas to be measured has a linear relationship with the photoionization current w...

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Application Information

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IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 王辰刘凤俊刘洋袁丁吴红彦夏征
Owner BEIJING HTNOVA DETECTION TECH CO LTD
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