CN102324371B - Ionization chamber of photoionization gas detecting instrument based on printed circuit board process - Google Patents
Ionization chamber of photoionization gas detecting instrument based on printed circuit board process Download PDFInfo
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- CN102324371B CN102324371B CN 201110252650 CN201110252650A CN102324371B CN 102324371 B CN102324371 B CN 102324371B CN 201110252650 CN201110252650 CN 201110252650 CN 201110252650 A CN201110252650 A CN 201110252650A CN 102324371 B CN102324371 B CN 102324371B
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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
The present invention relates to a kind of photo-ionization gas detector ionization chamber, particularly relate to a kind of photo-ionization gas detector ionization chamber based on printed circuit board process.
Background technology
Photo-ionization gas detector is a kind of gas detecting instrument for detection of volatile organic compounds or other toxic and harmful based on the photoionization principle; it not only can embed gas chromatograph and directly measure traces of hydrocarbons compounds in atmosphere; and also have a wide range of applications in fields such as IAQ (indoor air quality) detection, industrial flow detection, drugs and explosive detection, battlefield biochemical war agent monitoring, fire-fighting, anti-terrorism, Aero-Space, also become the powerful tool of the aspects such as real-time detection pollution, trace detection and environmental protection simultaneously.But, usually because gas concentration is all very little, so the design quality of photo-ionization gas detector ionization chamber has directly determined the sensitivity of detector, the volume of existing photo-ionization gas detector ionization chamber is large, and optical path length is short, enter the not fully ionization of gas in ionization chamber.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of photo-ionization gas detector ionization chamber based on printed circuit board process, and it has guaranteed the enough little of volume, has guaranteed again enough optical path lengths, and the gas entered in ionization chamber is fully ionized.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of photo-ionization gas detector ionization chamber based on printed circuit board process, it is characterized in that, photo-ionization gas detector ionization chamber based on printed circuit board process is comprised of two overlapping placements of identical battery lead plate, the thickness of the photo-ionization gas detector ionization chamber based on printed circuit board process is two plate electrode plate thickness sums, battery lead plate comprises three pads, be respectively equipped with the first via hole on three pads, the second via hole, the 3rd via hole, the reverse side of two plate electrode plates contacts, two plate electrode plates pass through respectively at the first via hole, the second via hole, contact pin of the interior placement of the 3rd via hole carries out machinery and fixes and be electrically connected, a contact pin connects bias electrode, a contact pin receives collector, another one contact pin ground connection.
Preferably, described battery lead plate also comprises copper layer, center roof vent, ceramic substrate, ground plane, ground plane is positioned at a side of the first via hole, copper layer, ceramic substrate surround center roof vent, three pads are positioned on ceramic substrate, the ground plane of two plate electrode plates overlaps fully, and center roof vent forms path.
Preferably, described battery lead plate is made by stupalith, battery lead plate be shaped as circle, prevent the gas oxidation in the surface gold-plating of copper layer.
Preferably, described center roof vent be shaped as circle, the hole wall of center roof vent requires absolute insulation, the center roof vent of two plate electrode plates definitely connects, and forms complete path.
Preferably, described battery lead plate is made by printed circuit technology.
Positive progressive effect of the present invention is: the present invention has guaranteed the enough little of volume, has guaranteed again enough optical path lengths, and the gas entered in ionization chamber is fully ionized.
The accompanying drawing explanation
The structural representation that Fig. 1 is battery lead plate front in the present invention.
The structural representation that Fig. 2 is battery lead plate reverse side in the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The photo-ionization gas detector ionization chamber that the present invention is based on printed circuit board process is comprised of two overlapping placements of identical battery lead plate, as depicted in figs. 1 and 2, battery lead plate comprises copper layer 1, center roof vent 2, pad 3, ceramic substrate 4, ground plane 5, be respectively equipped with the first via hole 31 on three pads 3, the second via hole 32, the 3rd via hole 33, ground plane 5 is positioned at a side of the first via hole 31, copper layer 1, ceramic substrate 4 surrounds center roof vent 2, three pads 3 are positioned on ceramic substrate 4, the reverse side of two plate electrode plates contacts, the ground plane of two plate electrode plates overlaps fully, center roof vent forms path, two plate electrode plates pass through respectively at the first via hole 31, the second via hole 32, contact pin of the interior placement of the 3rd via hole 33 carries out machinery and fixes and be electrically connected, a contact pin connects bias electrode, a contact pin receives collector, another one contact pin ground connection.Battery lead plate is made by stupalith, battery lead plate be shaped as circle, prevent the gas oxidation in the surface gold-plating of copper layer.Center roof vent be shaped as circle, the hole wall of center roof vent requires absolute insulation, the center roof vent of two plate electrode plates definitely connects, and forms complete path, and prevents the gas oxidation in copper layer surface gold-plating.Battery lead plate is made by printed circuit technology.
Because the spacing of battery lead plate is very little, excessive for preventing humidity, form moisture signal between two plate electrode plates, the overlapping layer ground connection of two plate electrode plates, due to earth polar, at ionization chamber, be partly hollow here, so do not affect the Electric Field Distribution in chamber.The electrode of ionization chamber upper surface is passive electrode, collects positive ion; The electrode of lower surface is bias electrode, collects electronics; Middle electrode is ground-electrode, isolated humidity electric current.
The present invention has been owing to having adopted above-mentioned structure, the overlapping layer ground connection of two-layer battery lead plate, ionization chamber itself had certain for microsignal humidity compensate, and do not affect the distribution of ionization chamber internal electric field.After tested gas molecule enters ionization chamber, gas molecule, under the irradiation of ultraviolet light, is ionized into ion and the electronegative electronics of positively charged, and to the two poles of the earth, shifts under the effect of electric field, is collected pole plate and accepts to transfer to electric signal.
The thickness that the present invention is based on the photo-ionization gas detector ionization chamber of printed circuit board process is two plate electrode plate thickness sums, sufficient design freedom, optical path length have been guaranteed, make again the ionization chamber volume enough little, the gas entered in ionization chamber is fully ionized simultaneously.The thickness that the present invention is based on the photo-ionization gas detector ionization chamber of printed circuit board process is only 1mm, the diameter of center roof vent is 0.6mm, the pitch of holes of center roof vent is 0.1mm (namely 4mil), on the center roof vent direct projection face that is distributed in uviol lamp symmetrically.The photo-ionization gas detector ionization chamber that the present invention is based on printed circuit board process had both guaranteed effectively to collect area, can take full advantage of ultraviolet light again, and because the thickness of ionization chamber is very little, it is very short that gas diffuses to the time of balance in ionization chamber, thus fast response time (being less than three seconds) and the signal linearity good.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make various changes or modifications to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (4)
1. the photo-ionization gas detector ionization chamber based on printed circuit board process, it is characterized in that, photo-ionization gas detector ionization chamber based on printed circuit board process is comprised of two overlapping placements of identical battery lead plate, the thickness of the photo-ionization gas detector ionization chamber based on printed circuit board process is two plate electrode plate thickness sums, battery lead plate comprises three pads, be respectively equipped with the first via hole on three pads, the second via hole, the 3rd via hole, the reverse side of two plate electrode plates contacts, two plate electrode plates pass through respectively at the first via hole, the second via hole, contact pin of the interior placement of the 3rd via hole carries out machinery and fixes and be electrically connected, a contact pin connects bias electrode, a contact pin receives collector, another one contact pin ground connection, battery lead plate also comprises copper layer, center roof vent, ceramic substrate, ground plane, ground plane is positioned at a side of the first via hole, and copper layer, ceramic substrate surround center roof vent, and three pads are positioned on ceramic substrate, the ground plane of two plate electrode plates overlaps fully, and center roof vent forms path.
2. the photo-ionization gas detector ionization chamber based on printed circuit board process as claimed in claim 1, is characterized in that, described battery lead plate is made by stupalith, battery lead plate be shaped as circle, prevent the gas oxidation in the surface gold-plating of copper layer.
3. the photo-ionization gas detector ionization chamber based on printed circuit board process as claimed in claim 2, it is characterized in that, described center roof vent be shaped as circle, the hole wall of center roof vent requires absolute insulation, the center roof vent of two plate electrode plates definitely connects, and forms complete path.
4. the photo-ionization gas detector ionization chamber based on printed circuit board process as claimed in claim 1, is characterized in that, described battery lead plate is made by printed circuit technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110252650 CN102324371B (en) | 2011-08-30 | 2011-08-30 | Ionization chamber of photoionization gas detecting instrument based on printed circuit board process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110252650 CN102324371B (en) | 2011-08-30 | 2011-08-30 | Ionization chamber of photoionization gas detecting instrument based on printed circuit board process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102324371A CN102324371A (en) | 2012-01-18 |
| CN102324371B true CN102324371B (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110252650 Active CN102324371B (en) | 2011-08-30 | 2011-08-30 | Ionization chamber of photoionization gas detecting instrument based on printed circuit board process |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140095A (en) * | 2015-07-30 | 2015-12-09 | 安徽中杰信息科技有限公司 | One-dimensional structure diffusion ionization chamber for photoionization detection of volatile gas |
| CN109884165B (en) * | 2019-03-11 | 2024-05-28 | 重庆邮电大学 | Ionization chamber of photoionization detector and photoionization detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4161655A (en) * | 1977-11-28 | 1979-07-17 | General Electric Company | Multi-cell detector using printed circuit board |
| CN101308125A (en) * | 2007-05-18 | 2008-11-19 | 华瑞科学仪器(上海)有限公司 | Photoionization detector, gas-chromatography detection system and chromatographic detector method |
-
2011
- 2011-08-30 CN CN 201110252650 patent/CN102324371B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4161655A (en) * | 1977-11-28 | 1979-07-17 | General Electric Company | Multi-cell detector using printed circuit board |
| CN101308125A (en) * | 2007-05-18 | 2008-11-19 | 华瑞科学仪器(上海)有限公司 | Photoionization detector, gas-chromatography detection system and chromatographic detector method |
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| CN102324371A (en) | 2012-01-18 |
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