CN104392889A - Ion mobility spectrometer and method for controlling ion gate by using alternating current superposition method - Google Patents
Ion mobility spectrometer and method for controlling ion gate by using alternating current superposition method Download PDFInfo
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- CN104392889A CN104392889A CN201410773280.XA CN201410773280A CN104392889A CN 104392889 A CN104392889 A CN 104392889A CN 201410773280 A CN201410773280 A CN 201410773280A CN 104392889 A CN104392889 A CN 104392889A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/426—Methods for controlling ions
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Abstract
The invention relates to an ion mobility spectrometer and method for controlling an ion gate by using an alternating current superposition method. The alternating current superposition method is adopted, and a set of series resistance circuit is added and is connected to one end of the ion gate. When no pulse signal is input, the size of resistance value of a potentiometer in the series resistance circuit is adjusted, and the potential difference between two sets of metal wires of the ion gate is changed, so that the potential difference between the metal wires is large enough, the ion gate is completely closed to prevent ions from entering a migration zone from a reaction zone; when a pulse signal is input, the potential and polarity of the pulse signal enable the voltage between the two sets of metal wires of the ion gate to be equal, the ion gate is opened, the ions can penetrate through the ion gate to reach the migration zone to be detected by an ion signal detector. The control way can effectively achieve the function of the ion mobility spectrometer. The device cost of the ion mobility spectrometer is reduced, the resolution ratio or the signal to noise ratio of the ion mobility spectrometer can be increased, and the functions of the ion mobility spectrometer are enriched.
Description
Technical field
The invention belongs to analytical instrument and detection field, be specifically related to a kind of utilization and exchange ionic migration spectrometer and the method that stacked system controls ion gate.
Background technology
Ion gate is one of core component of ion mobility spectrometry instrument.By controlling the switch of ion gate, the ion of migration tube reaction zone periodically can enter migration area by ion, is detected after being separated by detector.
In conventional ionic migration spectrometer, the control mode of ion gate as shown in Figure 1, pulse signal is after driving power amplifies, directly be added on the migration electric field at plane place, ion gate place, pulse voltage after amplifying is floating ground voltage, and namely this voltage is can not be for referencial use with the ground of the accelerating field of migration tube.Therefore ion gate pulse driving power is that a high-voltage pulse of isolating completely over the ground amplifies power supply, and isolation voltage is generally greater than more than 3000V, expensive, improves the cost of ion mobility spectrometry instrument.Further, because ion gate two ends are uniform electric fields, during ion gate switch, the change of electric field is on the movement locus of ion without impact, and therefore under the fixing condition of other parameters, the resolution of ionic migration spectrometer or signal strength signal intensity are fixed values.
Summary of the invention
The problem that the technology of the present invention solves: the high cost and the complicated circuit that overcome the floating ground ion gate pulse power in existing ionic migration spectrometer, a kind of utilization is provided to exchange ionic migration spectrometer and the method that stacking method controls ion gate, this interchange stacking method is utilized to control ion gate, ion gate high-voltage pulse power source is isolated without the need to floating, reduces the device cost of ionic migration spectrometer.In addition, by changing the size of electrical potential difference absolute value between ion gate two groups of wires, the resolution of ion mobility spectrometry can be improved or increase its signal to noise ratio, enriching the function of ionic migration spectrometer.
The technology of the present invention solution: a kind ofly utilize the ionic migration spectrometer exchanging superposing control ion gate, comprises one group of series resistance circuit (1), wire (2), high voltage source (3), potentiometer (4), wire (5), ground wire (6), first group of ion gate wire (7), voltage dividing resistance circuit (8), second group of ion gate wire (9), the high-voltage pulse power source (10) of ion gate and ion signal detector (11); Described series resistance circuit (1) one end is connected with transference tube high voltage source (3) by wire (2), and the other end connects potentiometer (4); Potentiometer (4) is connected with ground wire (6) by wire (5); First group of ion gate wire (7) is connected with the voltage dividing resistance circuit (8) on migration tube, and second group of ion gate wire (9) is connected with the A point in series resistance circuit (1); When ion gate high-voltage pulse power source (10) pulse-free signal is input to ion gate, adjustment potentiometer (4) resistance size, change the electrical potential difference between first group of ion gate wire (7), second group of ion gate wire (9), this electromotive force extent guarantees that enough ions that stops completely enter into migration area from reaction zone, realizes the function of closing ion gate; When there being pulse signal to input, the size of pulse and polarity make the voltage between first group of ion gate wire (7) and second group of ion gate metal (9) equal, ion gate is opened, ion enters migration area by ion gate from reaction zone and is detected by ion signal detector (11), so namely achieves the function of ion mobility spectrometry.
Described series resistance, its total resistance is more than 3 times of the total resistance of divider resistance on migration tube, and resistance type can be fixed carbon resister, synthesis fixed carbon resister, organic solid resistor, Inorganic solid resistance, metalfilmresistor, nitride film resistance, deposited film resistance, glass glaze film resistance, wire-wound resistor.
Described potentiometer, reconciles its resistance value, guarantees that ion gate two groups of wire electrical potential differences are enough to ion gate is closed.Potentiometer type can be wirewound potential meter, carbon composition film potentiometer, metal glaze potentiometer, organic solid potentiometer, conductive plastic potentiometer, metal forming potentiometer, metal film potentiometer and burning membrane potentiometer.
The implementation procedure of the inventive method is as follows: one group of ion gate wire in ion gate is connected with B point in the voltage dividing resistance circuit on migration tube, and another group ion gate wire is connected with the A point in series resistance circuit.When ion gate pulse power pulse-free signal is input to ion gate, adjustment potentiometer resistance, make the electrical potential difference between two groups of wires enough high, ion gate is closed, ion can not enter migration area from reaction zone; During the input of ion gate pulse signal, the size of pulse and polarity make the voltage between ion gate two groups of wires equal, ion gate is opened, and ion can enter migration area by ion gate from reaction zone and be detected by ion signal detector, achieves the function that ion mobility spectrometry periodically detects ion.
The present invention's advantage is compared with prior art;
(1) the present invention utilizes interchange stacked system, by the resistance of regulator potentiometer, changes the electrical potential difference between ion gate two groups of ion gate wires, when pulse-free signal inputs, closes ion gate; When there being pulse signal to input, ion gate is opened.Utilize the mode of this interchange superposing control ion gate, the ion gate pulse power is isolated without the need to floating, reduces its cost of manufacture.
(2) the present invention controls ion gate by exchanging stacked system, in the ion gate down periods, there is inhomogeneous field in migration tube.Change the absolute value of ion gate two groups of ion gate wire electromotive forces, the ion mobility spectrometry (being suitable for the analysis of the complex system containing many kinds of substance) of resolution raising or the ion mobility spectrometry (being suitable for the analysis to low concentration sample) of signal to noise ratio increase can be obtained.
Accompanying drawing explanation
Fig. 1 is the connection schematic diagram of conventional ion migration spectrum intermediate ion door type of drive and driving power;
Fig. 2 is a kind of ionic migration spectrometer schematic diagram utilizing interchange stacking control method ion gate of the present invention;
Fig. 3 is that utilization of the present invention exchanges stacking method when controlling ion gate, when second group of ion gate electromotive force wiry absolute value is greater than first group of ion gate electromotive force absolute value wiry, and the distribution map of the electric field in migration tube;
When Fig. 4 is utilization of the present invention interchange stacking method control ion gate, when second group of ion gate electromotive force wiry absolute value is greater than first group of ion gate electromotive force absolute value wiry, the ion mobility spectrometry of reactive ion when ion gate pass gate voltage is 100 volts;
Fig. 5 is that utilization of the present invention exchanges stacking method when controlling ion gate, when second group of ion gate electromotive force wiry absolute value is less than first group of ion gate electromotive force absolute value wiry, and the distribution map of the electric field in migration tube;
When Fig. 6 is utilization of the present invention interchange stacking method control ion gate, when second group of ion gate electromotive force wiry absolute value is less than first group of ion gate electromotive force absolute value wiry, when cervical orifice of uterus pass gate voltage is 100 volts, the ion mobility spectrometry of reactive ion;
Embodiment
As shown in Figure 2, a kind of utilization of the present invention exchanges the ionic migration spectrometer that stacking method controls ion gate, be with the difference of traditional ionic migration spectrometer: first group of ion gate wire 7 in ion gate is connected on the A point of one group of series resistance circuit 1, second group of ion gate wire 9 is connected with the B point of migration tube voltage dividing resistance circuit 8.By potentiometer 4 resistance size in adjustment series resistance, change ion gate two groups of ion gate wires 7, the electrical potential difference between 9.When the ion gate pulse power 10 no pulse voltage signal is input to ion gate, adjustment potentiometer 4 resistance size, make ion gate two groups of ion gate wires 7, the electrical potential difference between 9 can stop ion to enter into migration area from reaction zone, realizes the function of closing ion gate; When there being Puled input, the size of pulse signal and polarity make the voltage at ion gate two ends completely equal, ion gate is opened, and ion can enter migration area by ion gate from reaction zone and be detected by ion signal detector 11, so just achieves the function of ion mobility spectrometry.Adopt the ionic migration spectrometer of this interchange stacked system, its ion gate high-voltage pulse power source 10 does not need to isolate with floating, and reduces the cost of ion gate power supply and ion mobility spectrometry instrument.
Utilize this interchange overlay model, in migration tube there is inhomogeneous field in ion gate both sides.When electromotive force absolute value on second ion gate wire 9 is greater than the electromotive force absolute value on first group of ion gate wire 7, the resolution of ionic migration spectrometer is improved; When electromotive force absolute value on second group of ion gate wire 9 is less than the electromotive force absolute value on first group of ion gate wire 7, the signal strength signal intensity of ionic migration spectrometer increases, and signal to noise ratio improves.Enrich the function of ion mobility spectrometry further.
When ion gate is closed, in migration tube there is inhomogeneous field in ion gate both sides, as shown in Figure 3, when the electromotive force absolute value of second group of ion gate wire 9 is greater than the electromotive force absolute value of first group of ion gate wire 7, electric field in the reaction zone of the ion gate left side is weakened, electric field in migration area, the right is reinforced, and presents left-to-right by by force to weak variation tendency.Because the electric field of ion gate left side reaction zone is weakened, therefore tail off at the ion populations of the gathering in this region, after ion gate is opened, arrive the number of ions also corresponding minimizing of migration area through ion gate, therefore, the signal of ion mobility spectrometry reduces.For one, migration area ion packet, due to the electric field grow of migration area, and left-to-right weakens gradually, and the electric field action power that now the ion packet left side is subject to is greater than the right, and therefore ion packet is compressed, and peak shape narrows, and the resolution of ion mobility spectrometry improves.Fig. 4 is greater than first group of ion gate electromotive force absolute value wiry when second group of ion gate electromotive force wiry absolute value, when ion gate pass gate voltage is 100 volts, and the ion mobility spectrometry of reactive ion.
In addition, according to Ion transfer spectral resolution computing formula:
Wherein, R is the resolution of ion mobility spectrometry, q be ion with electric charge, E is the electric field strength of migration area, L
dbe migration area length, k is Boltzmann constant, and T is the temperature (K) in migration tube.When the electric field E of migration area becomes large, resolution also increases thereupon.
On the contrary, as shown in Figure 5, when the electromotive force absolute value of wherein second group of ion gate wire 9 is less than the electromotive force absolute value of first group of ion gate wire 7, electric field in the reaction zone of the ion gate left side is reinforced, therefore increase at the ion populations of the gathering in this region, after ion gate is opened, the number of ions arriving migration area through ion gate also strains many mutually, and the signal strength signal intensity of ion mobility spectrometry increases.Electric field on the right of ion gate in migration area is weakened, and presents the variation tendency that left-to-right grows from weak to strong, and the resolution of ion mobility spectrometry reduces.Fig. 6 is less than first group of ion gate electromotive force absolute value wiry when second group of ion gate electromotive force wiry absolute value, when ion gate pass gate voltage is 100 volts, and the ion mobility spectrometry of reactive ion.
In a word, intermediate ion door high-voltage pulse power source of the present invention, without the need to isolating over the ground, reduces the cost of ion gate high-voltage pulse power source and ion mobility spectrometry instrument; In addition, stacking method driving ion gate is exchanged owing to adopting, the ion gate down periods, inhomogeneous field is there is in migration tube, by changing the size of electromotive force absolute value between two groups of ion gate wires, the Electric Field Distribution on ion gate both sides in migration tube can be changed, obtaining the ion mobility spectrometry of resolution raising or the ion mobility spectrometry of signal to noise ratio increase, make ionic migration spectrometer have resolution improve and signal strength signal intensity increase two kinds of mode of operations, enriched the function of ionic migration spectrometer.
Specification of the present invention does not elaborate part and belongs to techniques well known.
Claims (10)
1. utilize and exchange stacking method and control the ionic migration spectrometer of ion gate, it is characterized in that: comprise one group of series resistance circuit (1), wire (2), high voltage source (3), potentiometer (4), wire (5), ground wire (6), first group of ion gate wire (7), voltage dividing resistance circuit (8), second group of ion gate wire (9), the high-voltage pulse power source (10) of ion gate and ion signal detector (11); Described series resistance circuit (1) one end is connected with transference tube high voltage source (3) by wire (2), and the other end connects potentiometer (4); Potentiometer (4) is connected with ground wire (6) by wire (5); First group of ion gate wire (7) is connected with the voltage dividing resistance circuit (8) on migration tube, and second group of ion gate wire (9) is connected with the A point in series resistance circuit (1); When ion gate high-voltage pulse power source (10) pulse-free signal is input to ion gate, adjustment potentiometer (4) resistance size, change the electrical potential difference between first group of ion gate wire (7), second group of ion gate wire (9), this electromotive force extent guarantees that enough ions that stops completely enter into migration area from reaction zone, realizes the function of closing ion gate; When there being pulse signal to input, the size of pulse and polarity make the voltage between first group of ion gate wire (7) and second group of ion gate metal (9) equal, ion gate is opened, ion enters migration area by ion gate from reaction zone and is detected by ion signal detector (11), so namely achieves the function of ion mobility spectrometry.
2. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: total resistance of described series resistance circuit (1) is more than three times of the total resistance of voltage dividing resistance circuit on migration tube (8).
3. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: the resistance of described regulator potentiometer (4), when ion gate high-voltage pulse power source (10) pulse-free signal is input to ion gate, change the electrical potential difference between first group of ion gate wire (7) and second group of ion gate metal (9), make the electrical potential difference between wire enough large, guarantee that ion gate is closed completely, blocks ions enters into migration area from reaction zone.
4. according to claim 1 utilization exchanges stacking method and controls the ionic migration spectrometer of ion gate, it is characterized in that: described ion gate high-voltage pulse power source (10) is isolated without the need to floating.
5. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: after adopting interchange stacked system to control ion gate, in migration tube, ion gate both sides exist inhomogeneous field.
6. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: in the ion gate down periods, non homogen field is there is in migration tube, when the electromotive force absolute value of wherein second group of ion gate metal (9) is greater than the electromotive force absolute value of first group of ion gate wire (7), the electric field on the ion gate left side is weakened, the electric field on the right is reinforced, and present left-to-right by by force to weak variation tendency, now the signal strength signal intensity of ionic migration spectrometer reduces, and resolution improves.
7. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: in the ion gate down periods, non homogen field is there is in migration tube, when the electromotive force absolute value of wherein second group of ion gate wire (9) is less than the electromotive force absolute value of first group of ion gate wire (7), the electric field on the ion gate left side is reinforced, the electric field on the right is weakened, and present the variation tendency that left-to-right grows from weak to strong, now the signal strength signal intensity of ionic migration spectrometer increases, and resolution reduces.
8. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: in described series resistance circuit, the type of resistance (1) is fixed carbon resister, synthesis fixed carbon resister, organic solid resistor, Inorganic solid resistance, metalfilmresistor, nitride film resistance, deposited film resistance, glass glaze film resistance or wire-wound resistor.
9. according to claim 1 utilization exchanges the ionic migration spectrometer that stacking method controls ion gate, it is characterized in that: described potentiometer (4) is wirewound potential meter, carbon composition film potentiometer, metal glaze potentiometer, organic solid potentiometer, conductive plastic potentiometer, metal forming potentiometer, metal film potentiometer or burning membrane potentiometer.
10. one kind utilizes the ionic migration spectrometer exchanging stacking method control ion gate, it is characterized in that: described method adopts and exchanges stacking method, increase by one group of series resistance circuit (1), in ion gate a second group ion gate wire (9) is connected on the some A of one group of series resistance circuit (1), first group of ion gate wire (7) is connected with the upper B point of migration tube voltage dividing resistance circuit (8), by adjustment potentiometer (4) resistance size, change the electrical potential difference between ion gate two groups of ion gate wires; When no pulse voltage signal inputs, adjustment potentiometer (4) resistance size, makes the electrical potential difference between ion gate two groups of ion gate wires that ion can be stoped to enter into migration area from reaction zone, realizes the function of closing ion gate; When there being Puled input, the size of pulse signal and polarity make the voltage at ion gate two ends completely equal, ion gate is opened, and ion can enter migration area by ion gate from reaction zone and be detected by ion signal detector (11), so just achieves the function of ion mobility spectrometry.
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| CN104835713A (en) * | 2015-05-26 | 2015-08-12 | 中国工程物理研究院流体物理研究所 | Ion gate controller for ion mobility spectrometer and control method thereof |
| CN105428200A (en) * | 2015-12-30 | 2016-03-23 | 广州禾信分析仪器有限公司 | Drift time ion migration spectral device |
| CN106653558A (en) * | 2017-03-20 | 2017-05-10 | 天津大学 | Proton transfer reaction ion source for ion migration spectrum |
| CN106783506A (en) * | 2016-12-08 | 2017-05-31 | 中国科学院合肥物质科学研究院 | The ionic migration spectrometer and detection method of the voltage-controlled ion gate processed of a kind of utilization dipulse, Asymmetric Electric |
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| CN108899264A (en) * | 2018-06-07 | 2018-11-27 | 中国科学院合肥物质科学研究院 | A kind of highly sensitive High-Field asymmetric waveform ionic migration spectrum detection device |
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| CN110828281A (en) * | 2019-11-15 | 2020-02-21 | 中国科学院大连化学物理研究所 | Ion enrichment ion migration tube |
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| CN113675069A (en) * | 2021-08-20 | 2021-11-19 | 苏州微木智能系统有限公司 | Ion migration system |
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| CN107516628A (en) * | 2017-08-15 | 2017-12-26 | 中国科学院合肥物质科学研究院 | A kind of bipolarity Hadamard converts ionic migration spectrometer |
| CN108899264A (en) * | 2018-06-07 | 2018-11-27 | 中国科学院合肥物质科学研究院 | A kind of highly sensitive High-Field asymmetric waveform ionic migration spectrum detection device |
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| CN110310882A (en) * | 2019-07-03 | 2019-10-08 | 清华大学深圳研究生院 | The ion door control method of BN discrimination effects in a kind of improvement ion mobility spectrometry |
| CN110310882B (en) * | 2019-07-03 | 2021-03-12 | 清华大学深圳研究生院 | Ion gate control method for improving discrimination effect of BN gate in ion mobility spectrometry |
| CN110828281A (en) * | 2019-11-15 | 2020-02-21 | 中国科学院大连化学物理研究所 | Ion enrichment ion migration tube |
| CN111029241A (en) * | 2019-12-19 | 2020-04-17 | 中国科学院合肥物质科学研究院 | Ion mobility spectrometer and method for compensating ion mobility speed |
| CN112490108A (en) * | 2020-11-24 | 2021-03-12 | 中国科学院大连化学物理研究所 | Ion gate control method for automatically enriching ions |
| CN112490108B (en) * | 2020-11-24 | 2021-07-27 | 中国科学院大连化学物理研究所 | Ion gate control method for automatically enriching ions |
| CN112820620A (en) * | 2020-12-29 | 2021-05-18 | 中船重工安谱（湖北）仪器有限公司 | Symmetric ion gate control method for ion mobility tube |
| CN113675069A (en) * | 2021-08-20 | 2021-11-19 | 苏州微木智能系统有限公司 | Ion migration system |
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