CN103956316A - Power supply enabling ion mobility spectrometry single tube to detect positive and negative ions at the same time and detection method - Google Patents
Power supply enabling ion mobility spectrometry single tube to detect positive and negative ions at the same time and detection method Download PDFInfo
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Abstract
The invention discloses a power supply enabling an ion mobility spectrometry single tube to detect positive and negative ions at the same time and a detection method. On the premise of not changing the structure design of a traditional ion migration tube, a polarity conversion circuit is additionally arranged between a divider resistor and a high-voltage power source of a power supply unit of the ion migration tube, so that polarities of voltages at the highest end and the lowest end of the divider resistor are driven by control signals to be reverted, one or more times of polarity reversion are carried out in one time of analysis, positive ion mode detection is carried out under positive polarity, negative ion mode detection is carried out under negative polarity, and the positive and negative ion detection through the single tube is achieved. By means of the power supply and the detection method, on the premise of not changing the structure design of the traditional ion migration tube, the detection results of the positive and negative ions can be obtained at the same time after one time of analysis is completed.
Description
Technical field
The present invention relates to a kind of ion detection technology, be specifically related to transference tube technology.
Background technology
Ion mobility spectrometry (IMS) is to occur late 1960s, and the development of passing through decades has become the on-the-spot trace detection technology based on more ripe on molecular level.Core component in ionic migration spectrometer is transference tube.In transference tube, sample molecule, under the effect of ionization source, can produce corresponding product ion.These product ions are placed in atmospheric environment steady electric field, and they are because being slowed down by the acceleration of electric field and the collision of neutral atmospheric molecules, just show as in macroscopic view to have obtained a constant average speed.Because its charge-mass ratio of different product ions, space geometry configuration are different with collision cross section, thereby the average speed obtaining is also different, so they are just separated after one section of electric field, complete detected process thereby successively arrive detector.
Referring to Fig. 1, it is depicted as traditional transference tube structure chart.The transference tube of this structure, its working method is described below: the particulate of testing sample enters ionization district, at ionization source, (is generally
63ni) under effect, by proton abstraction reaction, electron attachment reaction, electron transfer reaction etc., generate metastable product ion.Product ion moves by entering in batch migration area in the control at one time of ion gate.They are just separated after one section of electric field, successively arrive gatherer and form faint pulse electrical signal, thereby complete detected process.
In Fig. 1, the position of Vg and Vd mark is the ion gate of transference tube, and its structure is by two metallic door grid (mutually insulated) that lean on very closely, specifically referring to Fig. 2.
In Fig. 1, ViWei ionization district voltage, Vg is the voltage of first ion gate grid, Vd is the voltage of second ion gate grid, while second the initiating terminal voltage (each electrode voltage on migration area is obtained by electric resistance partial pressure) that ion gate gate voltage is again migration area, body shell and gatherer are zero potential.In the situation that ion gate is closed, each electrode voltage is respectively | Vi|=V1, | Vg|=V2, | Vd|=V3, its height relation is as follows:
V1>>V3>V2>>0
In the moment of opening the door, Vg will be applied in one with original identical pulse of polarity of voltage, and amplitude is Δ V, at this moment has again following relation:
V1>>(V2+ΔV)>V3>>0
Obviously when ion gate is closed, have an electric field contrary with migration area direction of an electric field between two door grid of ion gate, ion cannot pass through.Opening the door moment, reversed electric field is repaired, and ion is allowed through.
Referring to Fig. 3, it is depicted as the supply power mode of conventional ion migration tube.As seen from the figure, in traditional ionic migration spectrometer, in ionic tube, each step voltage is obtained by electric resistance partial pressure by one group of high voltage source conventionally.
Work and supply power mode by above-mentioned conventional ion migration tube are known, and conventional ion migration tube drawback is that the connection polarity of high voltage source has determined the mode of operation of transference tube.When high voltage source is connected to positive supply, transference tube is operated in (mainly for the detection of drugs and extremely indivedual explosives) under positive ion mode, and when high voltage source is connected to negative supply, transference tube is operated in (mainly for the detection of most of explosives) under negative ion mode.Traditional ionic migration spectrometer is once analyzed and can only be worked in one mode, and this brings some inconvenience to instrument application at the scene.
The patent No. is 200910265443.2 Chinese patent, a kind of bipolar ion migration tube is disclosed, for the positive and negative product ion information that can reflect all sidedly that determinand is produced by ion source ionization simultaneously, it carries out very large change to the structure of transference tube, the complexity that the structure of transference tube is become very, this will affect the stable and reliability of transference tube work greatly, and in addition, its operation also complexity, the cost of table also will improve greatly.
Summary of the invention
For the existing problem of above-mentioned existing transference tube, the object of the present invention is to provide a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing.
On this basis, the present invention also provides a kind of method that simultaneously detects negative ions for conventional ion migration spectrum single tube.
In order to achieve the above object, the present invention adopts following object:
A kind ofly realize the power supply that ion mobility spectrometry single tube detects negative ions simultaneously, described power supply comprises high voltage source and divider resistance, this power supply also comprises polarity switching, described polarity switching by the positive and negative high and low two ends that are alternately added to divider resistance of the positive and negative electrode of high voltage source, makes ion mobility spectrometry single tube detect negative ions in once analyzing when ion mobility spectrometry single tube detects analysis simultaneously.
In the preferred version of this power supply, described polarity switching comprises four high pressure field effect transistor, and described four high pressure field effect transistor are by effective folding, by the positive and negative height two ends that are alternately added to divider resistance of the positive and negative electrode of high voltage source.
Further, the positive pole of described high voltage source is connected to the drain electrode of the first high pressure field effect transistor and the drain electrode that third high is pressed field effect transistor, and the negative pole of high voltage source is connected to the source electrode of the second high pressure field effect transistor and the source electrode of the 4th high pressure field effect transistor; The source electrode of the first high pressure field effect transistor is connected to the drain electrode of the second high pressure field effect transistor, and as output, be connected to one end of divider resistance, third high presses the source electrode of field effect transistor to be connected to the drain electrode of the 4th high pressure field effect transistor, and as output, is connected to the other end of divider resistance.
Further, each high pressure field effect transistor is by optocoupler driver drives.
Further, the control end of described smooth lotus root driver connects 3.3V voltage and pulse voltage control signal, and the drive end of light lotus root driver drives the grid that connects high pressure field effect transistor, and its driving voltage is provided by insulating power supply.
Further, described pulse voltage control signal comprises control signal CTRL+ and control signal CTRL-, described control signal CTRL+ and control signal CTRL-be+the CMOS level signal of 3.3V, Low level effectives both, high level is invalid, and when control signal CTRL+ is different with control signal CTRL-in low level state, when a control signal wherein, after high level state is stablized the Δ t time, another control signal could be in low level state, and the Δ t time is corresponding with the complete shut-in time of field effect transistor.
Further, described control signal CTRL+ is carried in the control end of the light lotus root driver that drives the first and the 4th high pressure field effect transistor; Described control signal CTRL-is carried in the control end of the light lotus root driver of driving second and third high pressure field effect transistor.
As the second object, a kind of method that simultaneously detects negative ions for conventional ion migration spectrum single tube, the single of the method by ion mobility spectrometry single tube in detecting and analyzing at least one times reversion be carried in the polarity of voltage at the high and low two ends of divider resistance, complete thus and in single analyses, detect negative ions simultaneously.
In the preferred version of the method, described method is passed through the orderly folding of four high pressure field effect transistor, the positive and negative height two ends that are alternately added to divider resistance by the both positive and negative polarity of high voltage source.
Further, in described method, by light lotus root driver, based on CMOS level signal CTRL+ and CTRL-, control four high pressure field effect transistor, when control signal CTRL+ and CTRL-are during in high level state, four light lotus root drivers that are connected with these two signals are all in closed condition, four high pressure field effect transistor cannot effectively be driven and be turn-offed, and now transference tube is in without electric field status;
When control signal CTRL+ is in low level state and control signal CTRL-during in high level state, two light lotus root drivers that are connected with control signal CTRL+ are in open mode, two light lotus root drivers that are connected with control signal CTRL-are in closed condition, the first and the 4th high-voltage field effect is in control effective driving and opens, second and third high press field effect transistor cannot effectively be driven and turn-off, now transference tube is in positive electric field state;
When control signal CTRL-is in low level state and control signal CTRL+ during in high level state, two light lotus root drivers that are connected with control signal CTRL-are in open mode, two light lotus root drivers that are connected with control signal CTRL+ are in closed condition, second and the third high effect of having a meeting, an audience, etc. well under one's control be in control effective driving and open, the first and the 4th high pressure field effect transistor cannot effectively be driven and be turn-offed, now transference tube is in negative electric field state, thereby realizes the conversion of ion mobility spectrometry single tube detecting pattern.
Scheme provided by the invention can not change under the prerequisite of conventional ion migration tube structure design, make transference tube can alternation in once analyzing under negative ions pattern, realize the complete testing result that just can simultaneously provide negative ions of single analyses.
Adopt scheme provided by the invention, can allow traditional transference tube within the time of once analyzing for 10 seconds, can carry out more than 40 times polarity inversion and measure, after single analyses, can provide the testing result of cation and anion simultaneously, when making conventional ion migration tube carry out drugs and explosive, survey, also the chemical detection for chemical warfare agent and some other kinds provides wide possibility.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
Fig. 1 is conventional ion migration tube structure schematic diagram;
Fig. 2 is the structural representation of conventional ion migration tube intermediate ion door grid;
Fig. 3 is the supply power mode schematic diagram of conventional ion migration tube;
Fig. 4 is the circuit theory diagrams of intermediate ion migration spectrum single tube power supply unit of the present invention;
Fig. 5 is the schematic diagram of control signal in the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
The present invention is detected in analysis and is reversed at least one times and be carried in the polarity of voltage at the high and low two ends of divider resistance by the single at conventional ion migration spectrum single tube (hereinafter to be referred as transference tube), make ion mobility spectrometry single tube can alternation in once analyzing under negative ions pattern, complete thus and in single analyses, detect negative ions, the so complete testing result that just can simultaneously provide negative ions of single analyses simultaneously.
On the basis of this principle, the present invention is not changing under the prerequisite of conventional ion migration tube structure design, by the power supply unit of conventional ion migration tube (being comprised of divider resistance and high voltage source) is improved, between divider resistance and high voltage source, increase by a polarity switching, by this polarity switching by high voltage source just, the positive and negative height that is alternately added to divider resistance of negative pole, low two ends, make like this high voltage source adopt under the prerequisite of form of power of input and output isolation, make to be added on the both end voltage that divider resistance is high and minimum and can carry out the reversion of polarity under the driving of control signal, thereby realize, in single analyses, carry out polarity inversion once or repeatedly, under positive polarity, transference tube carries out the detection of positive ion mode, under negative polarity, transference tube carries out the detection of negative ion mode, thereby complete single tube and detect negative ions.
Referring to Fig. 4, it is depicted as a kind of power supply unit circuit theory diagrams that can realize the transference tube of such scheme.
As seen from the figure, in this power supply unit, polarity switching is mainly comprised of four high pressure field effect transistor 1,2,3,4, and these four high pressure field effect transistor are by effective folding, by the positive and negative height two ends that are alternately added to divider resistance of the positive and negative electrode of high voltage source.
Concrete, the positive pole of high voltage source is connected to the drain electrode of the first high pressure field effect transistor 1 and the drain electrode that third high is pressed field effect transistor 3, and the negative pole of high voltage source is connected to the source electrode of the second high pressure field effect transistor 2 and the source electrode of the 4th high pressure field effect transistor 4; The source electrode of the first high pressure field effect transistor 1 is connected to the drain electrode of the second high pressure field effect transistor 2 simultaneously, and be connected to the high-end of divider resistance as output, third high presses the source electrode of field effect transistor 3 to be connected to the drain electrode of the 4th high pressure field effect transistor 4, and as output, is connected to the low side of divider resistance.
In order effectively to control four high pressure field effect transistor by effective folding, the present invention drives respectively this four high pressure field effect transistor by four optocoupler drivers.
Wherein, drive the optocoupler driver of the first high pressure field effect transistor 1, its control end consists of 3.3V voltage and control signal CTRL+, and drive end drives the grid that connects the first high pressure field effect transistor 1, and drive end driving voltage V1+ and V1-are provided by one group of insulating power supply.
Drive the optocoupler driver of the second high pressure field effect transistor 2, its control end consists of 3.3V voltage and control signal CTRL-, and drive end drives the grid that connects the second high pressure field effect transistor 2, and drive end driving voltage V2+ and V2-are provided by one group of insulating power supply.
Drive third high to press the optocoupler driver of field effect transistor 3, its control end consists of 3.3V voltage and control signal CTRL-, and drive end drives and connects the grid that third high is pressed field effect transistor 3, and drive end driving voltage V3+ and V3-are provided by one group of insulating power supply.
Drive the optocoupler driver of the 4th high pressure field effect transistor 4, its control end consists of 3.3V voltage and control signal CTRL+, and drive end drives the grid that connects the 4th high pressure field effect transistor 4, and drive end driving voltage V4+ and V4-are provided by one group of insulating power supply.
Here all light lotus root driver, high pressure field effect transistor and insulating power supplies are all that high pressure is withstand voltage, the device of high-isolating.It is withstand voltage and isolation voltage value depends on the operational voltage value (being the output valve of high voltage source) of migration tube.The high voltage source of take output 2000V is example, the withstand voltage of high pressure field effect transistor must be not less than 4000V (being the high voltage source output valve of twice), and the isolation voltage value of light lotus root driver and insulating power supply must be not less than 4000V (being the high voltage source output valve of twice).
And be added in control signal on light lotus root driver control signal pins CTRL+, CTRL-as shown in Figure 5, control signal CTRL+ and CTRL-are CMOS level (+3.3V) signal, CTRL+ and CTRL-are that low level (0V) is effective, (+3.3V) is invalid for high level, and control signal CTRL+ and CTRL-can not be simultaneously in low level states, must one of them after high level state is stablized the Δ t time, another could be in low level state.
Wherein the time slot of Δ t is corresponding with the complete shut-in time of field effect transistor, in order to wait for that field effect transistor closes completely, avoids high voltage short circuit.
Form thus ion mobility spectrometry single tube operation detection negative ions time (referring to Fig. 5), when control signal CTRL+ and CTRL-are during in+3.3V high level state, four light lotus root drivers that are connected with these two signals are all in closed condition, four high pressure field effect transistor cannot effectively be driven and be turn-offed, and now transference tube is in without electric field status;
When CTRL+ is 0V, CTRL-is+when 3.3V, two light lotus root drivers that are connected with CTRL+ are in open mode, two light lotus root drivers that are connected with CTRL-are in closed condition, cause accordingly high pressure field effect transistor 1 and 4 effectively to be driven and conducting, high pressure field effect transistor 2 and 3 cannot effectively be driven and be turn-offed, and now transference tube is operated under positive ion mode;
When CTRL-is 0V, CTRL+ is+when 3.3V, two light lotus root drivers that are connected with CTRL-are in open mode, two light lotus root drivers that are connected with CTRL+ are in closed condition, cause accordingly high pressure field effect transistor 1 and 4 effectively to be driven and conducting, high pressure field effect transistor 2 and 3 cannot effectively be driven and be turn-offed, and now transference tube is operated under negative ion mode.
In the process of switching at ionic tube extra electric field voltage, because ionic tube and peripheral bleeder circuit are not resistive load but with electric capacity or the inductance characteristic of part completely, the driving control end of high pressure field effect transistor is also with certain capacitive character in addition, therefore for the consideration of fail safe, the clearance delta t that must set apart in CTRL+ and CTRL-replace handoff procedure, thereby to guarantee that the abundant electric discharge of all devices avoids the state of pressing field effect transistor not close completely.
Thus, the present invention can not change under the prerequisite of conventional ion migration tube structure design, only by changing the circuit design of high voltage supply part, make transference tube can alternation in once analyzing under negative ions pattern, realize the complete testing result that just can simultaneously provide negative ions of single analyses.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. realize the power supply that ion mobility spectrometry single tube detects negative ions simultaneously for one kind, it comprises high voltage source and divider resistance, it is characterized in that, described power supply also comprises polarity switching, described polarity switching by the positive and negative high and low two ends that are alternately added to divider resistance of the positive and negative electrode of high voltage source, makes ion mobility spectrometry single tube detect negative ions in once analyzing when ion mobility spectrometry single tube detects analysis simultaneously.
2. a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing according to claim 1, it is characterized in that, described polarity switching comprises four high pressure field effect transistor, described four high pressure field effect transistor are by effective folding, by the positive and negative height two ends that are alternately added to divider resistance of the positive and negative electrode of high voltage source.
3. a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing according to claim 2, it is characterized in that, the positive pole of described high voltage source is connected to the drain electrode of the first high pressure field effect transistor and the drain electrode that third high is pressed field effect transistor, and the negative pole of high voltage source is connected to the source electrode of the second high pressure field effect transistor and the source electrode of the 4th high pressure field effect transistor; The source electrode of the first high pressure field effect transistor is connected to the drain electrode of the second high pressure field effect transistor, and as output, be connected to one end of divider resistance, third high presses the source electrode of field effect transistor to be connected to the drain electrode of the 4th high pressure field effect transistor, and as output, is connected to the other end of divider resistance.
4. according to a kind of described in claim 2 or 3, realize the power supply that ion mobility spectrometry single tube detects negative ions simultaneously, it is characterized in that, each high pressure field effect transistor is by optocoupler driver drives.
5. a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing according to claim 4, it is characterized in that, the control end of described smooth lotus root driver connects 3.3V voltage and pulse voltage control signal, the drive end of light lotus root driver drives the grid that connects high pressure field effect transistor, and its driving voltage is provided by insulating power supply.
6. a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing according to claim 5, it is characterized in that, described pulse voltage control signal comprises control signal CTRL+ and control signal CTRL-, described control signal CTRL+ and control signal CTRL-be+the CMOS level signal of 3.3V, Low level effectives both, high level is invalid, and when control signal CTRL+ is different with control signal CTRL-in low level state, when a control signal wherein, after high level state is stablized the Δ t time, another control signal could be in low level state, the Δ t time is corresponding with the complete shut-in time of field effect transistor.
7. a kind of power supply that ion mobility spectrometry single tube detects negative ions simultaneously of realizing according to claim 6, is characterized in that, described control signal CTRL+ is carried in the control end of the light lotus root driver that drives the first and the 4th high pressure field effect transistor; Described control signal CTRL-is carried in the control end of the light lotus root driver of driving second and third high pressure field effect transistor.
8. for conventional ion migration, compose the method that single tube detects negative ions simultaneously for one kind, it is characterized in that, the single of described method by ion mobility spectrometry single tube in detecting and analyzing at least one times reversion be carried in the polarity of voltage at the high and low two ends of divider resistance, complete thus and in single analyses, detect negative ions simultaneously.
9. a kind of method that simultaneously detects negative ions for conventional ion migration spectrum single tube according to claim 8, it is characterized in that, described method is passed through the orderly folding of four high pressure field effect transistor, the positive and negative height two ends that are alternately added to divider resistance by the both positive and negative polarity of high voltage source.
10. a kind of method that simultaneously detects negative ions for conventional ion migration spectrum single tube according to claim 9, it is characterized in that, in described method, by light lotus root driver, based on CMOS level signal CTRL+ and CTRL-, control four high pressure field effect transistor, when control signal CTRL+ and CTRL-are during in high level state, four light lotus root drivers that are connected with these two signals are all in closed condition, four high pressure field effect transistor cannot effectively be driven and be turn-offed, and now transference tube is in without electric field status;
When control signal CTRL+ is in low level state and control signal CTRL-during in high level state, two light lotus root drivers that are connected with control signal CTRL+ are in open mode, two light lotus root drivers that are connected with control signal CTRL-are in closed condition, the first and the 4th high-voltage field effect is in control effective driving and opens, second and third high press field effect transistor cannot effectively be driven and turn-off, now transference tube is in positive electric field state;
When control signal CTRL-is in low level state and control signal CTRL+ during in high level state, two light lotus root drivers that are connected with control signal CTRL-are in open mode, two light lotus root drivers that are connected with control signal CTRL+ are in closed condition, second and the third high effect of having a meeting, an audience, etc. well under one's control be in control effective driving and open, the first and the 4th high pressure field effect transistor cannot effectively be driven and be turn-offed, now transference tube is in negative electric field state, thereby realizes the conversion of ion mobility spectrometry single tube detecting pattern.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105225916A (en) * | 2015-09-02 | 2016-01-06 | 上海新漫传感技术研究发展有限公司 | Realize the high voltage source that single tube ionic migration spectrometer detects negative ions simultaneously |
| CN115901917A (en) * | 2022-11-28 | 2023-04-04 | 中船重工安谱（湖北）仪器有限公司 | High-voltage-multiplying output circuit and ion migration high-voltage control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105225916A (en) * | 2015-09-02 | 2016-01-06 | 上海新漫传感技术研究发展有限公司 | Realize the high voltage source that single tube ionic migration spectrometer detects negative ions simultaneously |
| CN105225916B (en) * | 2015-09-02 | 2017-06-23 | 上海新漫传感技术研究发展有限公司 | Realize that single tube ionic migration spectrometer detects negative ions high voltage power supply and method simultaneously |
| CN115901917A (en) * | 2022-11-28 | 2023-04-04 | 中船重工安谱（湖北）仪器有限公司 | High-voltage-multiplying output circuit and ion migration high-voltage control circuit |
| CN115901917B (en) * | 2022-11-28 | 2023-11-07 | 中船重工安谱（湖北）仪器有限公司 | High-voltage-multiplying output circuit and ion migration high-voltage control circuit |
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