CN109884167A - Ionization chamber and spiral path miniature photoionization detection device - Google Patents
Ionization chamber and spiral path miniature photoionization detection device Download PDFInfo
- Publication number
- CN109884167A CN109884167A CN201910232913.9A CN201910232913A CN109884167A CN 109884167 A CN109884167 A CN 109884167A CN 201910232913 A CN201910232913 A CN 201910232913A CN 109884167 A CN109884167 A CN 109884167A
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- shell
- ionisation chamber
- gas passage
- collection plate
- detection device
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- 238000001824 photoionisation detection Methods 0.000 title description 2
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000005684 electric field Effects 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 150000001768 cations Chemical class 0.000 abstract description 5
- 238000000752 ionisation method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000010009 beating Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 29
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention discloses a kind of ionisation chamber and spiral road miniature optical ionization detection devices, the ionisation chamber includes cavate shell, it is correspondingly arranged at the en plaque earthing pole and voltage pole of shell inner top and bottom, and it is fixed in shell and corresponds to the gas passage of external connection, the gas passage is made and in the metal-coated film in inner wall lower half of gas passage using as collection plate of translucent material.Apply ultraviolet light and electric field simultaneously under test gas molecule circulation path, 8 area of daylighting area and collection plate is increased by spiral shape gas passage 7, to considerably increase collecting efficiency.In ionisation chamber 2, ultraviolet light and extra electric field just can be acted on simultaneously on VOC molecule, carry out the ionization process of VOC molecule almost simultaneously with ion deflecting process, this will be avoided cation from not beating on collection plate just in conjunction with electronics.
Description
Technical field
The invention belongs to photoionization detection technique fields, and in particular to a kind of ionisation chamber and spiral road miniature optical ionization
Detection device.
Background technique
The principle of photoionization detector (PID) is to generate ultraviolet light, gas to be measured using inert gas vacuum discharge phenomenon
VOC molecule absorption photon in body molecule, ionizes, and generates positively charged ion and electronics.In ionisation chamber, ion and electricity
Son fast moves under the action of extra electric field to metal electrode, generates micro current signal between two electrodes, by faint
Detection obtains the concentration of organic matter after signal amplification circuit amplifies current signal.Photoionization detector for TVOC detection
It (PID), is very sensitive detecting element, so needing to exclude the influence of electromagnetic interference, humidity, more dirt, Yi Jiti as far as possible
High VOC molecular discharge rate and collecting efficiency.
Existing photoionization detector (PID), the pre-ionization nearly all used, then by the positively charged ion of generation and
Electronics is passed through in ionisation chamber, this will lead to before entering ionisation chamber the positively charged ion and electronics in part in conjunction with and can not generate
Micro current signal, while passage path is short in the electric field and acquisition plate suqare is too small for charged particle in existing detector, from
And cause ion that can not be moved on collection plate, greatly reduce collecting efficiency.
Moreover, existing photoionization detector (PID), mostly integral structure, repair when situation occurs in instrument
To be more troublesome.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of detections of spiral road miniature optical ionization to fill
It sets, which improves detection effect.
The present invention is achieved by the following technical solutions:
A kind of ionisation chamber, including cavate shell are correspondingly arranged at the en plaque earthing pole and electricity of shell inner top and bottom
Pole is pressed, and is fixed in shell and corresponds to the gas passage of external connection, the gas passage is by translucent material
It is made and in the metal-coated film in inner wall lower half of gas passage using as collection plate.
In the above-mentioned technical solutions, the gas passage be include that plane formula spiral section and L shape draw section.
In the above-mentioned technical solutions, it is provided with ultraviolet radiator mounting hole at the top of the shell, with the mounting hole
Multiple loopholes are provided on corresponding earthing pole.
In the above-mentioned technical solutions, the shell includes the main body of a side opening, and fixes and connect with the main body
The side cover connect, the both ends of the gas passage are corresponding to be fixed on the side cover.
In the above-mentioned technical solutions, the gas passage is by MgF2It is made.
In the above-mentioned technical solutions, slot is respectively arranged at the top and bottom of the shell to position the ground connection
Pole and voltage pole or the earthing pole is corresponding with voltage pole is embedded in the shell.
In the above-mentioned technical solutions, electromagnetic shielding net is provided in the shell with dry for shielding external electrical field
It disturbs.
A kind of spiral road miniature optical ionization detection device fixes company including the ionisation chamber, with the ionisation chamber
The ultraviolet radiator connect is arranged in dehumidification device and filter device between air pump and gas channel inlet mouth, and adopts with described
Collect the micro-current magnification circuit that plate is electrically connected.
In the above-mentioned technical solutions, the ultraviolet radiator and shell are threadedly coupled.
In the above-mentioned technical solutions, the signal processing circuit of micro-current magnification circuit is laid out using PCB bilayer.
The advantages and benefits of the present invention are:
Apply ultraviolet light and electric field simultaneously under test gas molecule circulation path, is increased by spiral shape gas passage 7
Daylighting area and collection plate 8 area, to considerably increase collecting efficiency.In ionisation chamber 2, ultraviolet light and outer power-up
Field just can act on simultaneously on VOC molecule, carry out the ionization process of VOC molecule almost simultaneously with ion deflecting process, this will
Cation is avoided not beat on collection plate just in conjunction with electronics.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of spiral road miniature optical ionization detection device of the present invention.
Fig. 2 is vacuum UV lamp structure front view.
Fig. 3 is ionisation chamber structure front view.
Fig. 4 is airflow channel structure schematic diagram.
Fig. 5 is Fig. 4 side view.
It for those of ordinary skill in the art, without creative efforts, can be according to above attached
Figure obtains other relevant drawings.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, combined with specific embodiments below furtherly
Bright technical solution of the present invention.
Embodiment one
A kind of ionisation chamber of the invention, including cavate shell 3 such as fill shell using the cuboid of polytetrafluoroethylene (PTFE) support,
It is correspondingly arranged at the en plaque earthing pole 5 and voltage pole 6 of shell inner top and bottom, and is fixed in shell and corresponding
In the gas passage 7 of outside connection, the gas passage is made and of translucent material, such as MgF2 in the inner wall of gas passage
The metal-coated film in lower half is using as collection plate 8.Preferably, electromagnetic shielding net 4 is provided in the shell, for shielding
Cover external electrical field interference.Collection plate 8, by plated film mode, is plated under the insides of pipes of the gas passage 7 by high conducting material
Half part, with a thickness of 0.1mm.Its manufacture craft mode is the lower half portion of the gas passage 7 as in gold plating liquid,
Again by the precipitation method, invest one layer of uniform very thin gold thin film half side under 7 inner wall of gas spiral channel.Described
The gas passage corresponding position is provided with round ultraviolet radiator mounting hole 14 on shell.It is corresponding with the mounting hole to connect
Multiple loopholes are provided on earth polar.
It wherein, is further expansion air-flow working area, the gas passage includes that plane formula spiral section and L shape are drawn
Section out.A diameter of 4mm, the maximum radius of 7 spiral section of gas passage are slightly less than the ultraviolet radiator mounting hole 14, and
It is provided with blow vent 11 and gas outlet 12.Actual job stroke is effectively improved using plane formula spiral, improves detection effect.
Apply ultraviolet light and electric field simultaneously under test gas molecule circulation path, is increased by spiral shape gas passage 7
Daylighting area and collection plate 8 area, to considerably increase collecting efficiency.In ionisation chamber 2, ultraviolet light and outer power-up
Field just can act on simultaneously on VOC molecule, carry out the ionization process of VOC molecule almost simultaneously with ion deflecting process, this will
Cation is avoided not beat on collection plate just in conjunction with electronics.
Embodiment two
The shell includes the main body of a side opening, and the side cover 15 being fixedly connected with the main body, described
The both ends of gas passage are corresponding to be fixed on the side cover.The gas spiral shell is installed in the ionization chamber enclosure right cap 15
Revolve access 7, and by inlay or the modes such as screw is fixed be arranged on the right side of main body it is upper formed it is whole.Ionisation chamber shell side cover
15 removablies replace part of damage convenient for checking inside ionisation chamber 2.
Slot is respectively arranged at the top and bottom of the shell to position the earthing pole and voltage pole, Huo Zhesuo
The earthing pole stated is corresponding with voltage pole to be embedded in the shell.Specifically, the earthing pole 5 is made of stainless steel, and is inlayed
In ionization 3 inside top of chamber enclosure, with a thickness of 1mm, 14 part of face ultraviolet radiator mounting hole is provided with multiple light holes 13,
The voltage pole 6 is made of stainless steel,
Embodiment three
A kind of spiral road miniature optical ionization detection device fixes company including the ionisation chamber, with the ionisation chamber
The ultraviolet radiator connect is arranged in dehumidification device and filter device between air pump and gas channel inlet mouth, and adopts with described
Collect the micro-current magnification circuit that plate is electrically connected.
Wherein, the ultraviolet radiator and shell are threadedly coupled, i.e., a round hole is equipped at the top of the described ionization chamber enclosure 3
14 and hole wall on have thread groove 9.1 shell of vacuum UV lamp is equipped with screw thread 10, and the vacuum UV lamp 1 is assembled by screw thread 10
In the ionization room housing 3.Vacuum UV lamp 1 is connect with the shell 3 of ionisation chamber 2 by screw thread 10, convenient for receiving test examination instrument,
Present invention work first half term are as follows: under test gas first passes around dehumidification device, makes gas keep drying, using filtering
Device, it is therefore intended that the micro particle filtering that will may contain under test gas prevents from having an impact experimental result, while to instrument
Also function to certain protective effect.Treated under test gas then passes through blow vent 11 and enters ionisation chamber 2, due to ionisation chamber
There is ultraviolet light in 2, so that VOC molecule be made to ionize, generates cation and electronics；Meanwhile also added with vertical in ionisation chamber 2
Straight downward high voltage electric field, so that cation is by downward active force, to fall in the acquisition in spiral channel pipeline
On plate 8, micro-current is generated.
The present invention is in work the second half: the signal processing circuit of the micro-current magnification circuit is laid out using PCB bilayer,
Top layer and bottom electronic device are uniformly put.Amplifier selects high performance logafier, and faint voltage signal is carried out
Amplification.The advantages of according to logafier itself, can widen the amplification factor of signal, while high performance logafier is also
The error of amplified signal can be reduced.Signal amplification circuit is integrated in one block of dedicated PCB doubling plate, into the faint of the circuit
Current signal enters amplifier section using filter network filtering clutter in figure after I-U is converted.Entire circuit layout is stringent
It is required that symmetric configuration, specification cabling.
The spatially relative terms such as "upper", "lower", "left", "right" have been used in embodiment for ease of explanation, have been used for
Relationship of the elements or features relative to another elements or features shown in explanatory diagram.It should be understood that in addition to figure
Shown in except orientation, spatial terminology is intended to include the different direction of device in use or operation.For example, if in figure
Device be squeezed, the element for being stated as being located at other elements or feature "lower" will be located into other elements or feature "upper".
Therefore, exemplary term "lower" may include both upper and lower orientation.Device, which can be positioned in other ways, (to be rotated by 90 ° or position
In other orientation), it can be interpreted accordingly used herein of the opposite explanation in space.
Moreover, the relational terms of such as " first " and " second " or the like are used merely to one with another with identical
The component of title distinguishes, without necessarily requiring or implying between these components there are any this actual relationship or
Sequentially.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal
Fall into protection scope of the present invention.
Claims (10)
1. a kind of ionisation chamber, which is characterized in that including cavate shell, the en plaque for being correspondingly arranged at shell inner top and bottom is connect
Earth polar and voltage pole, and be fixed in shell and correspond to the gas passage of external connection, the gas passage by
Translucent material is made and in the metal-coated film in inner wall lower half of gas passage using as collection plate.
2. ionisation chamber as described in claim 1, which is characterized in that the gas passage be include plane formula spiral section and
L shape draws section.
3. ionisation chamber as described in claim 1, which is characterized in that be provided with ultraviolet radiator installation at the top of the shell
Hole is provided with multiple loopholes on earthing pole corresponding with the mounting hole.
4. ionisation chamber as described in claim 1, which is characterized in that the shell includes the main body of a side opening, Yi Jiyu
The side cover that the main body is fixedly connected, the both ends of the gas passage are corresponding to be fixed on the side cover.
5. ionisation chamber as described in claim 1, which is characterized in that the gas passage is by MgF2It is made.
6. ionisation chamber as described in claim 1, which is characterized in that be respectively arranged with slot at the top and bottom of the shell
It is embedded in the shell so that earthing pole and voltage pole or the earthing pole described in positioning are corresponding with voltage pole.
7. ionisation chamber as described in claim 1, which is characterized in that be provided in the shell electromagnetic shielding net (4) with
For shielding external electrical field interference.
8. a kind of spiral road miniature optical ionization detection device, it is characterised in that: described in any item including such as claim 1-7
The dehumidifying dress between air pump and gas channel inlet mouth is arranged in ionisation chamber, the ultraviolet radiator being fixedly connected with the ionisation chamber
It sets and filter device, and the micro-current magnification circuit being electrically connected with the collection plate.
9. a kind of spiral road miniature optical ionization detection device according to claim 8, it is characterised in that: described is ultraviolet
Line lamp and shell are threadedly coupled.
10. a kind of spiral road miniature optical ionization detection device according to claim 8, it is characterised in that: micro-current is put
The signal processing circuit of big circuit is laid out using PCB bilayer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232913.9A CN109884167B (en) | 2019-03-26 | 2019-03-26 | Ionization chamber and spiral path miniature photoionization detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910232913.9A CN109884167B (en) | 2019-03-26 | 2019-03-26 | Ionization chamber and spiral path miniature photoionization detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109884167A true CN109884167A (en) | 2019-06-14 |
| CN109884167B CN109884167B (en) | 2024-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910232913.9A Active CN109884167B (en) | 2019-03-26 | 2019-03-26 | Ionization chamber and spiral path miniature photoionization detection device |
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028617A (en) * | 1975-01-16 | 1977-06-07 | Hitachi, Ltd. | Ionization detector utilizing electric discharge |
| US4377749A (en) * | 1981-02-25 | 1983-03-22 | Young Robert A | Photoionizer |
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2019
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| CN109884167B (en) | 2024-05-24 |
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