CN203405367U - Ion migration spectrum detection system - Google Patents
Ion migration spectrum detection system Download PDFInfo
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- CN203405367U CN203405367U CN201320305236.7U CN201320305236U CN203405367U CN 203405367 U CN203405367 U CN 203405367U CN 201320305236 U CN201320305236 U CN 201320305236U CN 203405367 U CN203405367 U CN 203405367U
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Abstract
The utility model discloses an ion migration spectrum detection system which comprises an ion migration detection device, a sample feeding pipeline, a sample discharging pipeline and a circulating pipeline, wherein the circulating pipeline is arranged between the sample feeding pipeline and the sample discharging pipeline, the atmospheric pressure in the circulating pipeline is higher than that in the sample feeding pipeline, and part of detected gas leaving a gas outlet of the detection device is mixed with a gas sample to be detected introduced from the sample feeding pipeline and the circulating pipeline. By virtue of the ion migration spectrum detection system disclosed by the utility model, the bad influences caused by a negative-pressure suction device on the migration direction and migration distance of ions obtained by ionizing are avoided, and the detection accuracy and sensitivity of the ion migration spectrum detection system can be improved; a sample in the sample feeding pipeline can be diluted through the circulating pipeline, so that the detection device is uneasily polluted by sample gas; the pressure of the detection device is obviously increased, and thus the detection effect is improved.
Description
Technical field
The utility model relates to a kind of detection system, specifically a kind of ion mobility spectrometry detection system.
Background technology
(Ion Mobility Spectrometry is called for short: IMS), also claiming ion mobility spectrometry, is a kind of new gas phase separation and the detection technique just occurring at 20 century 70s Ion mobility spectrometry.The separation that it carries out ion with the difference of ion drift time is qualitative, by the concept that is similar to chromatographic retention, is originally called as plasma chromatography.Ion mobility spectrometry is divided into 3 major parts conventionally: with the sample introduction part of outside atmosphere interface; Ionize the migration tube of separated and ion detection; Obtain, analyze and show the pick-up unit of spectrogram.
The conventional air pump of Ion mobility spectrometry sucks samples and sample introduction by the mode of semi-permeable diaphragm sample introduction.Sample is brought into behind ionization reaction district by carrier gas, and a series of ionization reaction and ion-molecule reaction occur under ionogenic effect for carrier gas molecules and sample molecule, form various product ions.Under the ordering about of electric field, the ion gate that these ions are opened by periodicity enters drift region.In the process of constantly colliding at the neutral drift gas molecule with adverse current, due to these ions, in electric field, migration rate is different separately, makes different ions obtain separation, successively arrives collector detected.
Chinese patent CN102313774A discloses a kind of ion gate structure for ionic migration spectrometer and the method for operating of ionic migration spectrometer, and it comprises being arranged in order and comprises electrode before source, ionization source, tapered electrode, equipotential electrode, first ring or net electrode, migration area electrode, suppressor and Faraday plate.The ion gate structure that discloses this ionic migration spectrometer [0036] section of this patent in use, sample ions after ionization arrives near storage electrode under the effect of drawing electric field and carrier gas, in the ion storage stage, because near electric field storage electrode is 0, so after ion arrival, be just stored near storage area storage electrode.In such ion mobility spectrometer configuration, need the strict size of controlling load volume, if carrier gas is larger, just the sample ions being stored in memory block can be taken away and enter pump by powerful carrier gas, thereby cause the loss of a large amount of ion storages; And if load volume is too small, easily cause the ionic weight entering in pick-up unit to reduce, reduced the accuracy of testing result.
In addition, (High-Field Asymmetric Waveform Ion Mobility Spectrometry is called for short: FAIMS) technology is a kind of new gaseous ion isolation technics growing up on conventional ion migration spectral technology basis high electric field asymmetric waveform ion mobility spectrometry.The intrinsic property that this technology utilizes the mobility of different ions to have different variation tendencies in high electric field (being generally 15000V/cm) is realized the separation of ion, with respect to conventional ion migration spectral technology, the advantage that sensitivity is higher, has broad application prospects at trace materials detection fields such as explosive, drugs, environmental contaminants.
Chinese patent CN102646571A discloses a kind of High-Field asymmetric waveform ion mobility spectrometer based on ion exhausting gas system, comprises Circuits System and transference tube, and described transference tube comprises ion gun, separation detecting system and ion wind extract system; The body of transference tube is coated with electrode by two and forms with the substrate that brace summer is closely connected to form gas channel, and described electrode comprises separate mesh electrode, detecting electrode, sparking electrode and extraction electrodes; Wherein separate mesh electrode, detecting electrode and gas channel therebetween form separation detecting system, and sparking electrode, extraction electrodes and gas channel therebetween form ion wind extract system; Described ion gun is placed in substrate air intake opening end inner side.Ion wind circuit adds high voltage and produces the highfield that punctures air-flow between sparking electrode and extraction electrodes, the tip of the first sparking electrode and the second sparking electrode occurs discharge and produce ion, these ions arrive the first extraction electrodes and the second extraction electrodes under electric field action, thereby ion collision gas molecule in traveling process produces directed air-flow, and airflow direction is from sparking electrode to extraction electrodes.In this High-Field asymmetric waveform ion mobility spectrometer, the sample gas of testing sample and outside air suck in High-Field asymmetric waveform ion mobility spectrometer by ion wind extract system, to be detected after, waste gas is discharged from gas outlet.In the prior art, by adopting ion wind extract system, realize the motion of testing sample in ionic migration spectrometer, there is higher integrated level and avoided the harmful effect of air pump extract system, but because ion wind extract system can not produce larger air-flow, so its detection speed and precision cannot practical requirement; And because testing sample moves slowlyer in High-Field asymmetric waveform ion mobility spectrometer, be easy to pollution detection device, therefore produced to larger adverse effect the serviceable life to High-Field asymmetric waveform ion mobility spectrometer; Meanwhile, the negative pressure being produced by ion wind extract system completely due to testing sample pulls, and this negative pressure easily affects the ion motion in testing sample, therefore also can exert an adverse impact to testing result.
That is to say, in prior art, for testing sample, the motion in detecting device is all to realize by producing the mode of negative pressure suction, if negative pressure is too large, owing to ionizing migratory direction and the migration distance of ion out under negative pressure state, can produce deviation because of negative pressure, therefore can affect accuracy of detection and sensitivity; If negative pressure is less, its detection speed is lower on the one hand, also easily detecting device is polluted on the other hand, affects actual testing result.
Utility model content
For this reason, technical problem to be solved in the utility model is that ion mobility spectrometry pick-up unit of the prior art is in order to make sample gas arrive setting position, it is all to work under negative pressure state that its working environment is set, but under negative pressure state, migratory direction and the migration distance of ionization ion out can produce deviation because of negative pressure, accuracy of detection and sensitivity are poor, and then a kind of accuracy of detection and the high ion mobility spectrometry detection system of sensitivity are provided.
For solving the problems of the technologies described above, the utility model provides a kind of ion mobility spectrometry detection system, comprising:
Ion migration pick-up unit, detects for the gas sample to be detected, and described ion migration pick-up unit is provided with air intake opening and gas outlet;
Sample introduction pipeline, described sample introduction pipeline is communicated with described air intake opening, for introducing gas sample to be detected;
Go out sample pipeline, described in go out sample pipeline described gas outlet be in communication with the outside, for the gas after detecting being drawn to described ion migration pick-up unit;
Described sample introduction pipeline and described in go out between sample pipeline, to be also provided with circulation line, air pressure in described circulation line is higher than the air pressure in described sample introduction pipeline, and a part is left the gas sample to be detected that gas enters with sample feeding pipe pass by described circulation line after the detection of described gas outlet and mixed.
Described circulation line by the first three-way device and the second three-way device respectively with described sample introduction pipeline and described in go out sample pipeline connection.
First flow controller is set on described circulation line, and going out after described the second three-way device arranges second amount controller on sample pipeline.
By regulating respectively described first flow controller and second amount controller, making through going out sample tubes rows to extraneous airshed is 1:100 ~ 1:10 with the airshed ratio in circulation line.
Described is 1:49 through going out sample tubes rows to extraneous airshed with the airshed ratio in circulation line.
Between described gas outlet and described the second three-way device, air pump is set.
The flow of described air pump is 1300-1800ml/min.
The flow of described air pump is 1500ml/min.
On described circulation line, be also provided with filter core, described filter core is positioned at the downstream of described air pump.
Described ion migration pick-up unit is high electric field asymmetric waveform ion mobility spectrometry detecting device, and its migration tube is flat structure.
Described ion migration pick-up unit is low electric field and ionic migration spectrum detecting device.
Technique scheme of the present utility model has the following advantages compared to existing technology,
(1) in the utility model, described ion mobility spectrometry detection system comprises ion migration pick-up unit, sample introduction pipeline and go out sample pipeline, described sample introduction pipeline and described in go out between sample pipeline, to be also provided with circulation line, air pressure in described circulation line is higher than the air pressure in described sample introduction pipeline, a part is left the gas sample to be detected that gas enters with sample feeding pipe pass by described circulation line after the detection of ion migration pick-up unit gas outlet and is mixed, because the air pressure in circulation line is higher than the air pressure in sample introduction pipeline, so gas push after the detection that moves through malleation of gas sample to be detected in sample introduction pipeline and ion migration pick-up unit, avoided negative suction system in prior art to obtain the migratory direction of ion and the harmful effect of migration distance to ionization, thereby accuracy of detection and the sensitivity of ion migration pick-up unit have been improved, by circulation line, can the sample in sample introduction pipeline be diluted, make described detecting device be not easy to be polluted by sample gas, and, obviously increase the pressure of detecting device, promoted detection effect.
(2) in the utility model, described circulation line by the first three-way device and the second three-way device respectively with described sample introduction pipeline and described in go out sample pipeline connection, after detecting, gas mixes fully rear by described ion migration pick-up unit as carrier gas and described sample gas, make described sample gas uniformly by described ion migration pick-up unit, it is more accurate to measure.
(3) in the utility model, respectively at circulation line be communicated with extraneous to go out the first and second flow controllers are set on sample pipeline, can realize circulation line and the allocation proportion that is disposed to extraneous air-flow are controlled, by regulating different airshed ratios, can meet the dilution demand of different samples, thereby improve detection accuracy.
(4), in the utility model, between the gas outlet of ion migration pick-up unit and the second three-way device, air pump is set, to realize the air pressure of circulation line higher than the air pressure of sample introduction pipeline; And by the flow to air pump, be optimized adjusting, the accuracy of monitoring can be provided when providing malleation to promote diluting effect.
(5) in the utility model, also on described circulation line, filter core is set, the ，Ji Cong gas outlet, downstream that described filter core is positioned at described air pump waste gas out by filter element filtering after recycle use, can not disturb detect cause next time.
(6) in the utility model, described ion migration pick-up unit can be high electric field asymmetric waveform ion mobility spectrometry detecting device, and its migration tube is flat structure, or the ion mobility spectrometry detecting device that described ion migration pick-up unit is low electric field, the air inflow of the air output of described second amount controller and described sample introduction pipeline equates, thereby guarantee that the pressure in detecting device is stable, the tolerance of coming in equates with the tolerance that drains into atmosphere, the tolerance that is discharged to atmosphere by control is carried out the air inflow of Quality control, thereby while guaranteeing that ion migration pick-up unit is high electric field asymmetric waveform ion mobility spectrometry detecting device, air inflow can not pollute detecting device too much, if ion migration pick-up unit is the ion mobility spectrometry detecting device of low electric field, because its sensitivity is poor, the tolerance that is discharged to atmosphere by increase increases the air inflow of sample gas, thereby improves the degree of accuracy of this detecting device.
Accompanying drawing explanation
For content of the present utility model is more likely to be clearly understood, according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is a kind of ion mobility spectrometry detection system structural representation described in the utility model;
Fig. 2 is the detection background figure while not adopting the common gas circuit detection system of circulation line to detect;
Fig. 3 does not adopt the common gas circuit detection system of circulation line to detect resulting TNT signal graph to TNT;
Fig. 4 is the detection background figure of a kind of ion mobility spectrometry detection system described in the utility model while detecting;
Fig. 5 is that a kind of ion mobility spectrometry detection system described in the utility model detects resulting TNT signal graph to TNT;
In figure, Reference numeral is expressed as: 1-ion migration pick-up unit, 11-air intake opening, 12-gas outlet, 2-circulation line, 21-air pump, 22-filter core, 23-first flow controller, 24-second amount controller, 3-sample introduction pipeline, 4-goes out sample pipeline, 41-the first three-way device, 42-the second three-way device.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.
As shown in Figure 1, a kind of ion mobility spectrometry detection system, comprising: ion migration pick-up unit 1, for the gas sample to be detected, detect, and described ion migration pick-up unit 1 is provided with air intake opening 11 and gas outlet 12; Sample introduction pipeline 3, described sample introduction pipeline 3 is communicated with described air intake opening 11, for introducing gas sample to be detected; Go out sample pipeline 4, described in go out sample pipeline 4 described gas outlet 12 be in communication with the outside, for the gas after detecting being drawn to described ion migration pick-up unit 1; Described sample introduction pipeline 3 and described in go out between sample pipeline 4, to be also provided with circulation line 2, air pressure in described circulation line 2 is higher than the air pressure in described sample feeding pipe 3 tunnels, and a part is left the gas sample to be detected that gas is introduced with sample introduction pipeline 3 by described circulation line 2 after the detection of described gas outlet 12 and mixed.By the air pressure in circulation line 2, be set to higher than the air pressure in sample introduction pipeline 3, after the gas sample to be measured entering from sample introduction pipeline 3 is recycled the detection road 2, gas drives, thereby the mode with malleation enters in ion migration pick-up unit 1, avoided the problem producing with negative pressure mode inhaling air sample in prior art, accuracy of detection and the sensitivity of ion migration pick-up unit have been improved, and gas after the detection of introducing by circulation line, can the sample in sample introduction pipeline be diluted, make described detecting device be not easy to be polluted by sample gas, simultaneously, due to atmospheric pressure value higher in circulation line 2, can obviously increase the pressure in detecting device, therefore can significantly promote detection effect.
Described circulation line 2 by the first three-way device 41 and the second three-way device 42 respectively with described sample introduction pipeline 3 and described in go out sample pipeline 4 and be communicated with, the first three-way device 41 is arranged on the position of the gas sample inlet port to be detected of close sample introduction pipeline 3.By the first three-way device 41 is set, can realize better fully mixing of gas and gas sample to be detected after detecting, and because the first three-way device 41 is arranged on the position near the gas sample inlet port to be detected of sample introduction pipeline 3, between the first three-way device 41 and the air intake opening 11 of ion migration pick-up unit 1, also there is one section of pipeline, after entering the gas sample to be detected of sample introduction pipeline 3 and the detection in circulation line 2, gas can obtain sufficient mixing, guarantee testing result accurately.
In a preferred embodiment, can on described circulation line 2, first flow controller 23 be set, going out after described the second three-way device 42 arranges second amount controller 24 on sample pipeline 4.By regulating respectively described first flow controller 23 and second amount controller 24, make that to drain into extraneous airshed be 1:100-1:10 with airshed ratio in circulation line 2 through going out sample pipeline 4.The air inflow of the air output of described second amount controller 24 and described sample introduction pipeline 3 equates, thereby guarantee that the pressure in detecting device 1 is stable, the tolerance of coming in equates with the tolerance that drains into atmosphere, how many by the tolerance in controlled circulation pipeline 2, the different proportion that can realize gas sample to be detected and the rear gas of detection mixes, and can meet different detection demands.
In a preferred embodiment, described is 1:49 through going out sample tubes rows to extraneous airshed with the airshed ratio in circulation line.
In preferred implementation of the present utility model, between the described outlet 12 of described ion migration pick-up unit 1 and described the second three-way device 42, air pump 21 is set.The flow of described air pump can be 1300-1800ml/min.
In another preferred embodiment, the flow of described air pump is 1500ml/min, and by described first flow controller 23 and second amount controller 24, flow in described circulation line 2 is 1470ml/min, and by second amount controller 24, being directly disposed to extraneous flow is 30ml/min.By such setting, can obtain optimum gas sample dilution ratio to be detected, at the higher pressure of the interior acquisition of pick-up unit 1, in protection pick-up unit, obtain comparatively desirable accuracy of detection result.
In addition, can also on described circulation line 2, be provided with filter core 22, described filter core is positioned at the downstream of described air pump 21.By filter core 22 is set, can realize the gas after detecting is carried out to contaminant filter, after the detection after filter core 22 filters, gas can be used as desirable carrier gas and mixes with the gas sample to be detected in sample introduction pipeline 3, and assurance testing result is accurately and reliably.
In a preferred embodiment, described ion migration pick-up unit 1 can be high electric field asymmetric waveform ion mobility spectrometry detecting device, and the migration tube in described high electric field asymmetric waveform ion mobility spectrometry detecting device is flat structure.In another preferred embodiment, described ion migration pick-up unit 1 is low electric field and ionic migration spectrum detecting device.By circulation line 2, can realize as required different airshed and pressure in ion migration pick-up unit 1, not only expanded kind and the concentration requirement of gas sample to be detected, and can adopt according to the actual requirements different ion migration pick-up units, adaptability is stronger.
Described in above-mentioned embodiment, the use procedure of ion mobility spectrometry detection system is as follows:
Booster air pump, effect by means of filter core 22, make the pure carrier gas that in circulation line 2, generation is flowed, regulate as required the air inflow of first flow controller 23 and second amount controller 24, by sample introduction pipeline 3, suck sample gas to be detected, carrier gas in circulation line 2 is when by the first three-way device 41, be written into sample gas, by connecting the air intake opening 11 that enters together ion migration pick-up unit 1 after pipeline section mixes, gas after detection enters respectively circulation line 2 and ambient atmosphere by the second three-way device 42, the gas entering in circulation line 2 passes through after filter core 22 impurity screenings, reenter the first three-way device 41, complete once circulation.
In order clearer expression not adopt the two the difference of detection effect of the ion mobility spectrometry detection system of circulation line and ion mobility spectrometry detection system described in the utility model, spy gets identical TNT sample, in the situation that other conditions are all identical, use and do not adopt the ion mobility spectrometry detection system of circulation line and ion mobility spectrometry detection system described in the utility model to test.Through test, find, at the detecting device pressure of the detection system of the gas circuit that do not circulate, be-0.43bar, and the detection background of the detection system of the gas circuit that do not circulate and utilize the detection system of the gas circuit that do not circulate to detect TNT and the TNT signal difference that obtains is little, detect DeGrain, as shown in Figures 2 and 3; And the detecting device pressure with ion mobility spectrometry detection system described in the utility model is-0.04 bar, be significantly less than the detecting device pressure of the detection system of the gas circuit that do not circulate, getting identical TNT sample uses ion mobility spectrometry detection system described in the utility model to detect, the TNT signal and the detection background that detect have significant difference, as shown in Figures 4 and 5, thereby the signal characteristic that shows ion mobility spectrometry detection system described in the utility model and detect than the common gas circuit detection system that does not adopt circulation line is more obvious, detect effect more accurate.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (10)
1. an ion mobility spectrometry detection system, comprising:
Ion migration pick-up unit (1), detects for the gas sample to be detected, and described ion migration pick-up unit is provided with air intake opening (11) and gas outlet (12);
Sample introduction pipeline (3), described sample introduction pipeline (3) is communicated with described air intake opening (11), for introducing gas sample to be detected;
Go out sample pipeline (4), described in go out sample pipeline (4) described gas outlet (12) be in communication with the outside, for the gas after detecting being drawn to described ion migration pick-up unit (1);
It is characterized in that, described sample introduction pipeline (3) and described in go out between sample pipeline (4), to be also provided with circulation line (2), air pressure in described circulation line (2) is higher than the air pressure in described sample introduction pipeline (3), and a part is left the gas sample to be detected that gas enters with sample feeding pipe pass by described circulation line (2) after the detection of described gas outlet (12) and mixed.
2. ion mobility spectrometry detection system according to claim 1, is characterized in that, described circulation line (2) by the first three-way device (41) and the second three-way device (42) respectively with described sample introduction pipeline (3) and described in go out sample pipeline (4) and be communicated with.
3. ion mobility spectrometry detection system according to claim 2, it is characterized in that, first flow controller (23) is set on described circulation line (2), and going out after described the second three-way device (42) arranges second amount controller (24) on sample pipeline (4).
4. ion mobility spectrometry detection system according to claim 3, it is characterized in that, by regulating respectively described first flow controller (23) and second amount controller (24), make that to drain into extraneous airshed be 1:100-1:10 with airshed ratio in circulation line (2) through going out sample pipeline (4).
5. ion mobility spectrometry detection system according to claim 4, is characterized in that, described through going out, sample pipeline (4) drains into extraneous airshed and the airshed ratio in circulation line (2) is 1:49.
6. according to the ion mobility spectrometry detection system described in any one in claim 1-5, it is characterized in that, between described gas outlet (12) and described the second three-way device (42), air pump (21) is set.
7. ion mobility spectrometry detection system according to claim 6, is characterized in that, the flow of described air pump (21) is 1300-1800ml/min.
8. ion mobility spectrometry detection system according to claim 7, is characterized in that, the flow of described air pump (21) is 1500ml/min.
9. ion mobility spectrometry detection system according to claim 8, is characterized in that, is also provided with filter core on described circulation line, and described filter core is positioned at the downstream of described air pump.
10. ion mobility spectrometry detection system according to claim 9, is characterized in that, the high electric field asymmetric waveform ion mobility spectrometry detecting device that described ion migration pick-up unit is flat structure.
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| CN201320305236.7U CN203405367U (en) | 2013-05-30 | 2013-05-30 | Ion migration spectrum detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295871A (en) * | 2013-05-30 | 2013-09-11 | 苏州微木智能系统有限公司 | Ion mobility spectrometry detection system |
| CN107076703A (en) * | 2014-10-14 | 2017-08-18 | 史密斯探测-沃特福特有限公司 | Ionic migration spectrometer with ion modification |
-
2013
- 2013-05-30 CN CN201320305236.7U patent/CN203405367U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295871A (en) * | 2013-05-30 | 2013-09-11 | 苏州微木智能系统有限公司 | Ion mobility spectrometry detection system |
| CN107076703A (en) * | 2014-10-14 | 2017-08-18 | 史密斯探测-沃特福特有限公司 | Ionic migration spectrometer with ion modification |
| US10509011B2 (en) | 2014-10-14 | 2019-12-17 | Smiths Detection-Watford Limited | Ion mobility spectrometer with ion modification |
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