CN107917951A - Photoionization detector - Google Patents
Photoionization detector Download PDFInfo
- Publication number
- CN107917951A CN107917951A CN201610879381.4A CN201610879381A CN107917951A CN 107917951 A CN107917951 A CN 107917951A CN 201610879381 A CN201610879381 A CN 201610879381A CN 107917951 A CN107917951 A CN 107917951A
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- ionisation chamber
- ultraviolet lamp
- inlet pipe
- analyzed gas
- analyzed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
- G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The present invention provides a kind of photoionization detector, including：Ultraviolet lamp and ionisation chamber, the top of the ionisation chamber is inserted into the lower part of the ultraviolet lamp, the analyzed gas outlet pipe of the analyzed gas inlet pipe for being inserted into the side of the ionisation chamber and the opposite side for being inserted into the ionisation chamber, analyzed gas enters the ionisation chamber via the analyzed gas inlet pipe, it is ionized by the irradiation of ultraviolet light, and the electric current for data acquisition is produced under the action of electric field in the ionisation chamber, then discharged via the analyzed gas outlet pipe.Purge gas air inlet pipe is inserted into the lower part of the ionisation chamber, so that the gas outlet of purge gas air inlet pipe is located at the underface of the ultraviolet lamp window, so as to symmetrically purge and clean the window of ultraviolet lamp, it so can effectively extend the service life of ultraviolet lamp.By reducing the size and distance of ionisation chamber internal electrode, the volume of effective ionized region can be reduced, improve the sensitivity of detector.
Description
Technical field
The present invention relates to a kind of gas detection photoionization detector.
Background technology
Photoionization detector (Photo-ionization Detector, PID) is a kind of detector, extensively quilt
Detected for gas chromatographic analysis and organic volatile (VOC).Photoionization detector includes ultraviolet lamp and positioned at ultraviolet lamp
The ionisation chamber of lower section.Analyzed gas enters ionisation chamber via air inlet pipe, and the high energy ultraviolet that ultraviolet lamp is sent makes analyzed gas
Organic compound or part inorganic matter in body ionize.Under the action of electric field, the negative ions being ionized are electric respectively
Captured from the passive electrode in room and bias electrode, and form weak current, then by data acquisition after weak current amplifies
Card collection, for follow-up data analysis.
Analyzed gas passes in and out ionisation chamber for a long time, and the window of ultraviolet lamp bottom can be polluted, and in order to reduce the dirt
Dye, in the prior art, the purge gas air inlet pipe parallel to the window of ultraviolet lamp is employed in ionisation chamber, for parallel to
The window is purged on the direction of the window of ultraviolet lamp.Although certain cleaning work can be played to window parallel to the gas of the window
With, but since purge stream is in window surface skewness, so after long-time use, along the direction of air-flow, window
The clean-up performance of upper different zones can be different.Window close to purge gas air inlet pipe can be relatively cleaner, but other parts are dirty
Dye is still than more serious.
The content of the invention
, can be effectively the present invention provides a kind of photoionization detector in order to overcome problem existing in the prior art
Ensure the cleaning of the window of ultraviolet lamp, extend the service life of ultraviolet lamp.
The present invention provides a kind of photoionization detector, including：Ultraviolet lamp, ionisation chamber, the lower part insertion of the ultraviolet lamp
The top of the ionisation chamber, is inserted into the analyzed gas inlet pipe of the side of the ionisation chamber and is inserted into the another of the ionisation chamber
The analyzed gas outlet pipe of side, analyzed gas enters the ionisation chamber via the analyzed gas inlet pipe, by institute
State ultraviolet light irradiation be ionized and in ionisation chamber under the action of electric field and produce for data acquisition electric current, then via
The analyzed gas outlet pipe is discharged the ionisation chamber, wherein, it is inserted into purge gas air inlet in the lower part of the ionisation chamber
Pipe so that the gas outlet of purge gas air inlet pipe is located at the underface of the window of the ultraviolet lamp.
In this way, the window of ultraviolet lamp can symmetrically be purged, the cleannes of ultraviolet lamp window are effectively kept, are extended
The service life of ultraviolet lamp.
The ionisation chamber includes liner, and the purge gas air inlet pipe, purging are inserted into the center position of the liner
Gas inlet pipe is vertically right against the window of ultraviolet lamp.
The analyzed gas inlet pipe is inserted into the side of the liner, the quilt is inserted into the opposite side of the liner
Analyze gas outlet pipe.It is analyzed the window of gas inlet pipe and analyzed gas outlet pipe parallel to ultraviolet lamp.
The ionisation chamber further include the bias electrode for being sequentially embedded the liner and passive electrode, ultraviolet lamp gasket and
Inner cover, the ultraviolet lamp is inserted into the inner cover, and is contacted with the ultraviolet lamp gasket, wherein, the ultraviolet lamp gasket, which has, to be opened
Mouthful, so that the ultraviolet light that the ultraviolet lamp is sent can pass through the opening.
In this way, the ultraviolet that ultraviolet lamp is sent can only be irradiated to effective ionized space immediately below opening, without irradiating
To bias electrode and passive electrode, it is possible to reduce electrode because of ultraviolet excitation reasons for its use electric current.
The liner, the bias electrode and the passive electrode, the ultraviolet lamp gasket, the inner cover and the window
Discharge surface forms effective ionized space, and the analyzed gas enters the effectively ionization by the analyzed gas inlet pipe
Region, the ultraviolet light pass through the opening, irradiate the analyzed gas in the effectively ionized space so that the quilt
Analysis gas ionizes, and produces negative ions, and the negative ions are respectively by the passive electrode and the bias electrode
Captured, so as to produce the electric current.
Can by reduce the distance between the bias electrode and the passive electrode or reduce the bias electrode and
The respective length of the passive electrode or thickness, to reduce the volume of the effectively ionized space.
In this way, the sensitivity of detector can be improved by reducing the volume of effective ionized space.
In addition, the internal structure of ionisation chamber of the present invention is simple, so as to be effectively prevented from the uneven of analyzed gas
The dead volume for being distributed and being formed.
Brief description of the drawings
Fig. 1 is the side view of photoionization detector according to an embodiment of the invention；
Fig. 2 is the exploded view of photoionization detector according to an embodiment of the invention；
Fig. 3 is the cut-away view of ionisation chamber according to an embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawings, the photoionization detector of the present invention is described in detail.
Fig. 1 is the side view of photoionization detector according to an embodiment of the invention, and Fig. 2 is to implement according to the present invention
The exploded view of the photoionization detector of example.As shown in Figure 1, photoionization detector 10 (contains ultraviolet lamp tube including ultraviolet lamp 11
And the excitation power source and shielding case not marked in figure) and ionisation chamber 12, the lower part insertion ionisation chamber 12 of ultraviolet lamp 11 it is upper
Portion.
Photoionization detector 10 further includes analyzed gas inlet pipe 13 and the insertion of the side of insertion ionisation chamber 12
The analyzed gas outlet pipe 14 of the opposite side of ionisation chamber 12.Analyzed gas enters via analyzed gas inlet pipe 13 to be ionized
Room 12, is ionized by the irradiation of ultraviolet lamp 11, and produces under the action of electric field in ionisation chamber 12 and be used for data acquisition
Weak current, then discharged via analyzed gas outlet pipe 14 from ionisation chamber 12.
Ionisation chamber 12 includes liner 121, the analyzed gas inlet pipe 13 of insertion in the side of liner 121, in liner 121
The analyzed gas outlet pipe 14 of opposite side insertion.Analyzed gas inlet pipe 13 and analyzed gas outlet pipe 14 and ultraviolet lamp window
Mouth is parallel.As depicted in figs. 1 and 2, gas inlet pipe 13 and analyzed gas outlet pipe 14 are analyzed through the outer of ionisation chamber 12
Shell, is inserted into liner 121 from both sides respectively.
Purge gas air inlet pipe 15 is inserted perpendicularly into the lower part of ionisation chamber 12 and ultraviolet lamp window so that purge gas air inlet
The gas outlet of pipe 15 is located at the underface of the window 110 of ultraviolet lamp 11.Further, blown in the center position insertion of liner 121
Sweep gas inlet pipe 15.As depicted in figs. 1 and 2, purge gas air inlet pipe 15 passes through the shell of 12 bottom of ionisation chamber, is inserted into interior
The center of lining 121, the gas outlet 15a of purge gas air inlet pipe 15 are located at the underface of ultraviolet lamp 11 so that purge gas
Via purge gas air inlet pipe 15, from the center on the surface of the window 110 of the underface of ultraviolet lamp 11 purging ultraviolet lamp 11.
In this way, during analyzing analyzed gas, the dirt being adhered on 110 surface of window can be by symmetrically
Remove, the cleannes of the central area of window 110 can be effectively kept, so as to extend the service life of ultraviolet lamp 11.
Ionisation chamber 12 further includes bias electrode 122a and passive electrode 122b, the ultraviolet lamp gasket for being sequentially embedded liner 121
124 and inner cover 123, as shown in Figure 1, 2, ultraviolet lamp 11 is inserted into the opening 123a of inner cover 123, is connect with ultraviolet lamp gasket 124
Touch.Wherein, as shown in Fig. 2, ultraviolet lamp gasket 124 has opening 125, so that the ultraviolet light that ultraviolet lamp 11 is sent can be passed through and opened
Mouth 125.
Wherein, liner 121, bias electrode 122a and passive electrode 122b, ultraviolet lamp gasket 124, inner cover 123 and window
110 surfaces form effective ionized space 16, as shown in figures 1 and 3.Analyzed gas enters by analyzed gas inlet pipe 13
Effective ionized space 16, the ultraviolet light that ultraviolet lamp 11 is sent pass through opening 125, irradiate the analyzed gas in effective ionized space 16
Body so that analyzed gas ionizes, and produces negative ions, and negative ions are collected electrode 122b and bias electrode respectively
122a is captured, so as to produce weak current.Weak current is sticked into after current amplifier amplifies by existing data acquisition
Row collection, for data analysis.
Here, inner cover 123 is used to fix ultraviolet lamp 11, and ultraviolet lamp gasket 124 can prevent 110 quilt of window of ultraviolet lamp 11
Crushing.Further, since the ultraviolet light that ultraviolet lamp 11 is sent is merely able to through opening 125, and irradiate effective electricity immediately below opening
From region 16, without being irradiated to bias electrode 122a and passive electrode 122b, it is possible to reduce electrode because of ultraviolet excitation
And reasons for its use electric current.
Fig. 3 is the cut-away view of ionisation chamber according to an embodiment of the invention, as shown in figure 3, the square frame table of heavy line
Effect ionized space 16 is shown with, by reducing the distance between bias electrode 122a and passive electrode 122b or reducing bias electrode
122a and the respective length of passive electrode 122b or thickness, it is possible to reduce the volume of effective ionized space 16, so as to improve inspection
Survey sensitivity.
In addition, as described above, the internal structure of the ionisation chamber 12 in the present invention is simple, so as to be effectively prevented from analyzed gas
The uneven distribution of body and the dead volume formed.
Although the particular embodiment of the present invention has been described, these embodiments are only stated by way of example,
It is not intended to limit the scope of the present invention.In fact, innovative approach described herein can be implemented by various other forms；This
Outside, the spirit of various omissions, replacement and change to method described herein and system without departing from the present invention can also be carried out.
The purpose of appended claims and its equivalents is to cover the such various shapes being considered within the scope and spirit of the invention
Formula or modification.
Claims (6)
- A kind of 1. photoionization detector, it is characterised in that including：Ultraviolet lamp, for producing ultraviolet light,The top of the ionisation chamber is inserted into ionisation chamber, the lower part of the ultraviolet lamp,The analyzed gas of the analyzed gas inlet pipe for being inserted into the side of the ionisation chamber and the opposite side for being inserted into the ionisation chamber Body discharge pipe,Analyzed gas enters the ionisation chamber via the analyzed gas inlet pipe, by the irradiation of the ultraviolet light by Ionization, in the ionisation chamber under the action of electric field, produces the electric current for data acquisition, then via the analyzed gas Discharge pipe is discharged the ionisation chamber,Wherein, it is inserted into purge gas air inlet pipe in the lower part of the ionisation chamber so that the gas outlet of purge gas air inlet pipe is located at The underface of the ultraviolet lamp window.
- 2. photoionization detector as claimed in claim 1, it is characterised in that the ionisation chamber includes liner, described interior The center position of lining is inserted into the purge gas air inlet pipe.
- 3. photoionization detector as claimed in claim 2, it is characterised in that insertion is described in the side of the liner is divided Gas inlet pipe is analysed, the analyzed gas outlet pipe is inserted into the opposite side of the liner.
- 4. photoionization detector as claimed in claim 3, it is characterised in that the ionisation chamber further include be sequentially embedded it is described The bias electrode and passive electrode of liner, ultraviolet lamp gasket and inner cover, the ultraviolet lamp are inserted into the inner cover, and with it is described Ultraviolet lamp gasket contacts,Wherein, the ultraviolet lamp gasket has opening, so that the ultraviolet light can pass through the opening, while the ultraviolet light The bias electrode and the passive electrode are not irradiated.
- 5. photoionization detector as claimed in claim 4, it is characterised in that the liner, the bias electrode and described Passive electrode, the ultraviolet lamp gasket, the inner cover and the window surface form effective ionized space, the analyzed gas Body enters effective ionized space by the analyzed gas inlet pipe, and the ultraviolet light passes through the opening, irradiates institute State the analyzed gas in effective ionized space so that the analyzed gas ionizes, and produces negative ions, institute State negative ions to be captured by the passive electrode and the bias electrode respectively, so as to produce the electric current.
- 6. photoionization detector as claimed in claim 5, it is characterised in that by reducing the bias electrode and the receipts The distance between collector reduces the bias electrode and the respective length of the passive electrode or thickness, to reduce State the volume of effective ionized space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879381.4A CN107917951A (en) | 2016-10-09 | 2016-10-09 | Photoionization detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879381.4A CN107917951A (en) | 2016-10-09 | 2016-10-09 | Photoionization detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107917951A true CN107917951A (en) | 2018-04-17 |
Family
ID=61891608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610879381.4A Pending CN107917951A (en) | 2016-10-09 | 2016-10-09 | Photoionization detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107917951A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441385A (en) * | 2019-08-14 | 2019-11-12 | 中国电子科技集团公司第四十九研究所 | Miniature ionization chamber and miniature ultraviolet source integral piece for miniature optical ionization gas sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565183A (en) * | 2010-11-30 | 2012-07-11 | 通用电气公司 | Photo-ionization detectors and associated methods thereof |
| CN102662018A (en) * | 2010-11-30 | 2012-09-12 | 中国科学院大连化学物理研究所 | Photo ionization detector |
| CN203772800U (en) * | 2014-02-24 | 2014-08-13 | 天津七一二通信广播有限公司 | Universal type PID sensor gas chamber structure |
-
2016
- 2016-10-09 CN CN201610879381.4A patent/CN107917951A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565183A (en) * | 2010-11-30 | 2012-07-11 | 通用电气公司 | Photo-ionization detectors and associated methods thereof |
| CN102662018A (en) * | 2010-11-30 | 2012-09-12 | 中国科学院大连化学物理研究所 | Photo ionization detector |
| CN203772800U (en) * | 2014-02-24 | 2014-08-13 | 天津七一二通信广播有限公司 | Universal type PID sensor gas chamber structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441385A (en) * | 2019-08-14 | 2019-11-12 | 中国电子科技集团公司第四十九研究所 | Miniature ionization chamber and miniature ultraviolet source integral piece for miniature optical ionization gas sensor |
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Application publication date: 20180417 |