Ionization chamber of photoionization gas detecting instrument based on printed circuit board process

Abstract

The invention discloses an ionization chamber of a photoionization gas detecting instrument based on a printed circuit board process, which is formed by placing two electrode plates which are the same completely in an overlapped way. The thickness of the ionization chamber of the photoionization gas detecting instrument based on the printed circuit board process is the sum of the thicknesses of the two electrode plates; each electrode plate comprises three welding pads; the three welding pads are respectively provided with a first through hole, a second through hole and a third through hole; the back surfaces of the two electrode plates are in contact with each other; the two electrode plates are mechanically fixed and electrically connected by respectively placing one contact pin in the first through hole, the second through hole and the third through hole; one contact pin is connected with an offset electrode; another contact pin is connected with a collecting electrode; and the third contact pin is grounded. By using the ionization chamber of the photoionization gas detecting instrument based on the printed circuit board process, a small enough volume is guaranteed, and an enough optical path length is also ensured, so that the gas entering the ionization chamber is adequately ionized.

Description

technical field [0001] The invention relates to an ionization chamber of a photoionization gas detector, in particular to an ionization chamber of a photoionization gas detector based on a printed circuit board process. Background technique [0002] The photoionization gas detector is a gas detector based on the principle of photoionization for detecting volatile organic compounds or other toxic and harmful gases. It can not only be embedded in a gas chromatograph to directly measure trace hydrocarbons in the atmosphere, but also in Indoor air quality detection, industrial process detection, drug and explosive detection, battlefield biochemical warfare agent monitoring, fire protection, anti-terrorism, aerospace and other fields also have a wide range of applications, and it has also become a real-time detection of pollution, trace detection and environmental protection. A powerful tool in terms of However, usually because the gas concentration is very small, the design of ...

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Problems solved by technology

However, usually because the gas concentration is very small, the design of the ionization chamber of the photoionization gas detector directly determines the sensitivity of the detector. The ionization chamber of the existing photoionization gas detector has a large volume and a short optical path length. The gas entering the ionization chamber is not sufficiently ionized

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