CN214749954U - Ion mobility spectrometry equipment using double-window ultraviolet lamp ionization - Google Patents
Ion mobility spectrometry equipment using double-window ultraviolet lamp ionization Download PDFInfo
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- CN214749954U CN214749954U CN202120228311.9U CN202120228311U CN214749954U CN 214749954 U CN214749954 U CN 214749954U CN 202120228311 U CN202120228311 U CN 202120228311U CN 214749954 U CN214749954 U CN 214749954U
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Abstract
The utility model discloses an use two window ultraviolet lamp ionization's ion mobility spectrometry equipment relates to ion mobility spectrometry technical field. The ionization source of ion mobility spectrometry equipment is double-window ultraviolet lamp, and double-window ultraviolet lamp includes: the ultraviolet lamp comprises a glass tube, a first ultraviolet window, a second ultraviolet window and an excitation electrode, wherein the first ultraviolet window and the second ultraviolet window are respectively arranged at two ends of the glass tube, working gas is filled in the glass tube, and the excitation electrode is arranged on the outer wall of the glass tube. The scheme realizes photoionization of detected objects simultaneously under the condition of only using one ultraviolet light source, the light intensity of two ultraviolet windows can be kept consistent synchronously, the relevance of positive and negative ion mobility spectrums is improved, the ionization efficiency of two sides is ensured to be close, the occupation of a lamp body on the volume of ion mobility spectrum equipment is reduced, in addition, because only one lamp is driven, the energy consumption is reduced, one set of driving circuit is reduced, and the necessary volume and weight of the equipment are reduced from the lamp and the circuit.
Description
Technical Field
The utility model relates to an ion mobility spectrometry technical field especially relates to the ion mobility spectrometry equipment that uses two window ultraviolet lamps ionization.
Background
The ion mobility spectrometry generally adopts radioactive substance rays to ionize molecules such as water, oxygen and the like in the air, the molecules continuously interact with gaseous detected molecules to form an ion cluster, and the weak electric signals generated by the ion cluster are collected and detected, so that the material composition of the gas to be detected is qualitatively analyzed. Because of the danger of using radioactive substances, the ionization of the gas to be measured by using ultraviolet light is a more ideal alternative.
However, the existing ion mobility spectrometry equipment using the uv ionization method usually has only one mobility tube, and the electric field needs to be switched frequently, and a single electric field can only detect ions of one electrical property simultaneously, and there is a waiting time for ion rebalancing, which results in long time consumption and poor detection reliability in the detection process. If adopt two migration pipe designs, can realize that a migration pipe is invariable to be used for migrating positive ion, another migration pipe is invariable to be used for migrating negative ion, but because the electric field is fixed, so ionization zone electric field is also opposite, consequently needs two independent ionization zones to produce the ion of different electrical properties, if use traditional ultraviolet lamp to ionize, then need two independent ultraviolet lamps to realize to there may be the poor and ageing rate scheduling problem of ultraviolet lamp uniformity, influence the detection judgement of ion mobility spectrometry equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide an use two window ultraviolet lamp ionization's ion mobility spectrometry equipment.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
an ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp, the ionization source of the ion mobility spectrometry apparatus being a dual window ultraviolet lamp comprising: the ultraviolet detector comprises a glass tube, a first ultraviolet window, a second ultraviolet window and an excitation electrode, wherein the first ultraviolet window and the second ultraviolet window are respectively arranged at two ends of the glass tube, working gas is filled in the glass tube, the excitation electrode is arranged on the outer wall of the glass tube, the first ultraviolet window is used for ionizing detected gas molecules to generate positive ions, and the second ultraviolet window is used for ionizing detected gas molecules to generate negative ions.
The utility model provides an use ionic migration spectrum equipment of double window ultraviolet lamp ionization, through set up the ultraviolet window respectively at the both ends of glass pipe, every ultraviolet window is towards an ionization region, can be used for continuous positive ion ionization and negative ion ionization respectively, it is detected the thing to realize ionizing simultaneously under the condition that only uses an ultraviolet light source, the light intensity of two ultraviolet windows can keep unanimous in step, the relevance of positive negative ion migration spectrum has been improved, the ionization efficiency of having guaranteed both sides is close, the electric field in ionization region and migration region need not switch, detection speed and reliability have been improved. The utility model discloses a structural feature has reduced one set of light source drive circuit and electric field switching circuit, and the improve equipment reliability has reduced consumption and the volume that uses a plurality of lamp bodies, electric field switching circuit, has reduced necessary volume of equipment and weight from lamp and circuit.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a dual-window UV lamp according to an embodiment of the present invention;
fig. 2 is a schematic view of a structural framework provided by an embodiment of the ion mobility spectrometry apparatus using dual-window uv lamp ionization according to the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to explain the present invention and not to limit the scope of the invention.
Conventional example mobility spectrometry devices use metal isotopes having radioactivity (e.g.63Ni，241Am) ionizes water and oxygen molecules in the air and further combines with the detected object to generate ions. However, these materials are often subject to strict management, and equipment may be hazardous to personnel and environmental contamination after maintenance or damage. Ultraviolet light has no radioactivity, the photoionization process is stable, the interference caused by factors such as environmental humidity and pollution is small, and the driving circuit has the advantages of small volume and the like and is widely researched.
Because the electron gaining and losing tendency of the detected substance is different, different detected substances can be ionized by ultraviolet light to form positive ions and electrons, and the metal coating can be excited by the ultraviolet light to generate photoelectric effect, and the low-energy electrons are combined with oxygen molecules to form O2 -The negatively charged ions combine with the detected gas molecules to form negative ions, thereby completing the ionization process. Under the action of electric fields in different directions, the positive and negative product ions enter a migration region through an ion gate opened by periodic voltage control. In order to prevent the generated ions of the object to be detected from being combined with other ions of opposite electric polarity to form neutral molecules, an electric field exists in the ionization region, the gas to be detected moves to the front of the ion gate, and the other ions of electric polarity are far away from the ion gate. When the ion gate is opened, ions in the migration region obtain energy from the electric field for directional drift, and collide with neutral migration gas molecules flowing reversely continuously to lose energy. In order to simultaneously detect gases that may generate positive ions and negative ions, some ion mobility spectrometry devices use a dual ionization region and migration region design, thus requiring at least two photoionization sources.
Therefore, electric fields are required to be arranged in the ionization region and the migration region, and the field intensity directions are opposite for positive and negative ions. The electric field needs to be switched frequently, and a single electric field can only detect ions of one electric property at the same time, and the waiting time for ion rebalancing exists, so that the detection process consumes too long time and the detection reliability is poor. And because the electric field intensity used by the ion mobility spectrometry is large, generally 3 kV-5 kV, the volume and weight of a circuit part supporting high-voltage switching are large, so that a double-migration-tube design is often used for scenes with high sensitivity or needing to detect positive and negative ions simultaneously, namely, one migration tube is constantly used for migrating positive ions, and the other migration tube is constantly used for migrating negative ions.
The above dual tube design requires two separate ionization regions to generate ions of different electric properties because the electric fields in the inner ionization region and the transport region are fixed and opposite for both positive and negative ions. In order to ensure comparability and relevance of data on two sides, such as whether the detected substance is mainly positive ions or negative ions, the two ionization regions require that ionization efficiencies are the same or similar and have consistent trend of change. And the mode such as using a plurality of traditional single window ultraviolet photoionizations because all have uncontrollable production difference in all aspects such as gas concentration, purity and window cleanliness factor of different ultraviolet lamps, decay rate such as the gas leakage of different ultraviolet lamp bodies is also different in the use, therefore has a great deal of initial matching problem and calibration problem when using jointly, causes probably that just, the anion district uniformity is relatively poor and there may have extra maintenance problem in later stage.
In order to solve the above problems, the present patent proposes an ion mobility spectrometry apparatus using dual-window uv lamps for ionization, wherein the uv lamps using single-lamp dual-uv windows serve as ionization sources, each uv window faces an ionization region, and the simultaneous ionization of the detected objects is realized under the condition of using only one light source. The specific design structure of the single-lamp body double-ultraviolet-window ultraviolet lamp can refer to fig. 1.
As shown in fig. 1, for the structure diagram provided by the embodiment of the dual-window ultraviolet lamp of the present invention, the dual-window ultraviolet lamp includes: the ultraviolet gas detector comprises a glass tube 4, a first ultraviolet window 2, a second ultraviolet window 7 and an excitation electrode 5, wherein the first ultraviolet window 2 and the second ultraviolet window 7 are respectively arranged at two ends of the glass tube 4, working gas is filled in the glass tube 4, the excitation electrode 5 is arranged on the outer wall of the glass tube 4, the first ultraviolet window 2 is used for ionizing detected gas molecules to generate positive ions, and the second ultraviolet window 7 is used for ionizing the detected gas molecules to generate negative ions.
The operation of the dual window uv lamp will now be described.
After the exciting electrode 5 on the outer wall of the glass tube 4 is electrified, the ultraviolet lamp tube filled with working gas can be excited to emit ultraviolet light with certain intensity. The ultraviolet light may ionize a portion of the organic and inorganic gas molecules near the light source to produce ions. Specifically, the gas molecules to be detected in the positive ionization area are ionized through the first ultraviolet window 2, the gas molecules to be detected in the negative ionization area are ionized through the second ultraviolet window 7, and the light sources are the same, so that the light intensity of the two ultraviolet windows is synchronously kept consistent, the relevance of the positive and negative ion mobility spectrums is improved, and the ionization efficiency of the two sides is close to each other.
These ions are then collected by a faraday at the end of the migration zone, by the ionization zone, electric field selection and migration of the migration zone, resulting in a weak current. The current is amplified by the amplifying circuit to finally generate analog output of a low-resistance voltage signal, detection of specific substances can be realized according to the mobility of ions in a migration area, and in addition, gas molecular ions generated by ultraviolet light excitation are approximately in direct proportion to the concentration of the gas molecules, so that the concentration of the gas molecules can be determined under the condition of known gas types.
It will be appreciated that since the second uv window 7 is externally provided with a negative ionization region, the outer surface of the second uv window 7 needs to have a metal structure, for example, a metal gauze or a thin film, so that low-energy electrons are generated and further O is generated under the excitation of uv light2 -Plasma is generated.
Alternatively, the ultraviolet window may employ LiF, MgF2Or CaF2And vacuum ultraviolet light permeable material. The excitation electrode 5 may be plated with a metal such as Cu or Au. The working gas may be a rare gas such as Kr or Xe.
The ion mobility spectrometry equipment that this embodiment provided sets up the ultraviolet window respectively through the both ends at the glass pipe, every ultraviolet window is towards an ionization region, can be used for continuous positive ion ionization and negative ion ionization respectively, it is detected the thing to realize ionizing simultaneously under the condition that only uses an ultraviolet light source, the light intensity of two ultraviolet windows can keep unanimous in step, the relevance of positive and negative ion mobility spectrometry has been improved, the ionization efficiency of having guaranteed both sides is close, the electric field in ionization region and migration region need not switch, detection speed and reliability have been improved. The utility model discloses a structural feature has reduced one set of light source drive circuit and electric field switching circuit, and the improve equipment reliability has reduced consumption and the volume that uses a plurality of lamp bodies, electric field switching circuit, has reduced necessary volume of equipment and weight from lamp and circuit.
Optionally, in some possible embodiments, a gas absorbent 14 is also disposed inside the glass tube 4.
Alternatively, the gas absorbent 14 may employ an alloy material containing Zr, Al, and V.
Optionally, in some possible embodiments, the outer surface of the second uv window 7 is provided with a metal gauze or film.
It will be appreciated that the uv window provided with the metal gauze or membrane produces low energy electrons and further O under uv excitation2 -Thus, the uv window provided with the metal gauze or film corresponds to the negative ionization region.
Alternatively, in some possible embodiments, the first uv window 2 and the second uv window 7 employ the same vacuum uv transparent material.
The ultraviolet window is prepared by adopting the same vacuum ultraviolet light penetrable material, so that the relevance of the positive and negative ion mobility spectrometry can be further improved, and the ionization efficiency of two sides is closer.
A more detailed schematic diagram of an alternative configuration of an ion mobility spectrometry apparatus using dual window uv lamp ionization is provided, as shown in fig. 2, and some alternative configurations of an ion mobility spectrometry apparatus using dual window uv lamp ionization are described below in conjunction with fig. 2.
The ion mobility spectrometry apparatus using dual window ultraviolet lamp ionization further comprises: the ionization device comprises a gasification diversion cavity 1, a positive ionization region 3, a negative ionization region 6, two ion gates 8, a positive ion migration region 9, a negative ion migration region 10, two shielding grids 11, two Faraday discs 12 and an electric signal amplifying circuit 13, wherein:
two ion gates 8 are respectively arranged at the joint of the positive ionization region 3 and the positive ion migration region 9 and the joint of the negative ionization region 6 and the negative ion migration region 10, two shielding grids 11 are respectively arranged at the tail of the positive ion migration region 9 and the tail of the negative ion migration region 10, and two Faraday discs 12 are respectively arranged at the tail of the positive ion migration region 9 and the tail of the negative ion migration region 10;
the gasification diversion cavity 1 is provided with an air inlet of the gas to be detected;
a first ultraviolet window 2 of the double-window ultraviolet lamp is arranged in a positive ionization region 3, a first air inlet of the positive ionization region 3 is communicated with a gasification diversion cavity 1, migration air flow can enter the positive ionization region 2 from the migration region through an ion gate 8, the positive ionization region 3 is communicated with a positive ion migration region 9 through the ion gate 8 which is controlled to be opened by periodic voltage, and an air outlet is further formed in the side wall of the positive ionization region 3;
a second ultraviolet window 7 of the double-window ultraviolet lamp is arranged in the negative ionization region 6, a first air inlet of the negative ionization region 6 is communicated with the gasification diversion chamber 1, migration air flow can enter the negative ionization region from the migration region through an ion gate 8, a second air inlet of the negative ionization region 6 is arranged on the ion gate 8, the negative ionization region 6 is communicated with the ion gate 8 which is controlled to be opened by periodic voltage, and an air outlet is further formed in the side wall of the negative ionization region 6;
a shielding grid 11 and a Faraday disc 12 in the positive ion migration region 9 are arranged at one end, far away from the ion gate 8, in the positive ion migration region 9, the Faraday disc 12 is connected with an electric signal amplifying circuit 13, and the side wall of the positive ion migration region 9 is provided with an air inlet for inputting migration gas;
the shielding grid 11 and the Faraday disc 12 in the negative ion migration region 10 are arranged at one end, far away from the ion gate 8, in the negative ion migration region 10, the Faraday disc 12 is connected with the electric signal amplifying circuit 13, and the side wall of the negative ion migration region 10 is provided with an air inlet for inputting migration gas.
The electric signal amplifying circuit is used for amplifying the electric signals generated by the positive ionization structure and the negative ionization structure.
It is to be understood that the positive ionization region, the first ion gate, the positive ion transport region, the first shielding grid and the first faraday disk constitute a positive ionization structure, which is merely a functional expression and does not represent a real device. The negative ionization region, the second ion gate, the negative ion migration region, the second shielding grid mesh and the second Faraday disk form a negative ionization structure, and the negative ionization structure is just a functional expression and does not represent an actual device.
The operation of the ion mobility spectrometry apparatus using dual window uv lamp ionization is described below.
High-voltage alternating current is conducted on an exciting electrode 5 of the double-window ultraviolet lamp to excite working gas in the glass tube 4 to generate light, wherein ultraviolet light is emitted into a positive ionization region 3 and a negative ionization region 6 through a first ultraviolet window 2 and a second ultraviolet window 7 respectively;
the substance to be tested enters from the inlet of the gasification diversion cavity 1 for gasification and diversion, and the diverted gas enters the positive ionization region 3 from the first gas inlet of the positive ionization region 3 and enters the negative ionization region 6 from the first gas inlet of the negative ionization region 6;
the gas entering the positive ionization region 3 is ionized to generate positive ions under the action of the first ultraviolet window 2, the ion gate 8 is opened and closed through periodic voltage change, so that the positive ions enter the positive ion migration region 9 through the ion gate 8, the length range of the positive ion migration region 9 can be 5-30 cm, an electric field of 100V/cm-300V/cm exists, the positive ions can obtain energy, and the positive ions move towards the direction far away from the first ion gate 8; the positive ion migration zone 9 simultaneously contains migration gas with the direction opposite to the total movement speed of positive ions, the migration gas enters from a gas inlet arranged at the tail part of the positive ion migration zone 9, the ion gate 8 is a pair of parallel metal wires and can help the migration gas to enter the positive ionization zone 3 from the ion gate 8, and the migration gas, the sample gas and the like can be discharged from a gas outlet on the side wall of the positive ionization zone 3;
after the positive ions move to the Faraday disc 12, the positive ions are contacted with a metal electrode on the surface of the Faraday disc 12 to generate weak initial electric signals, and then the weak initial electric signals are amplified through an electric signal amplifying circuit 13 and are used for analyzing gas composition components;
the gas entering the negative ionization region 6 is ionized to generate negative ions under the action of the second ultraviolet window 7, the ion gate 8 is opened and closed through periodic voltage change, so that the negative ions enter the negative ion migration region 10 through the ion gate 8, the length range of the negative ion migration region 10 can be 5-30 cm, an electric field of 100V/cm-300V/cm exists, the direction of the electric field is opposite to that of the electric field of the positive ion migration region 9, the negative ions can obtain energy, and the negative ions move in the direction far away from the ion gate 8; the negative ion migration zone 10 simultaneously contains migration gas with the direction opposite to the total movement speed of negative ions, the migration gas enters from a gas inlet arranged at the tail part of the negative ion migration zone 10, the ion gate 8 is a pair of parallel metal wires and can help the migration gas to enter the negative ionization zone 6 from the ion gate 8, and the migration gas, the sample gas and the like can be discharged from a gas outlet on the side wall of the negative ionization zone 6;
after the negative ions move to the Faraday disc 12, the negative ions are contacted with a metal electrode on the surface of the Faraday disc 12 to generate a weak initial electric signal, and then the weak initial electric signal is amplified through an electric signal amplifying circuit 13 and is used for analyzing gas composition components;
wherein a shielding mesh 11 disposed in front of the faraday plate 12 is used to shield the faraday plate 12 to reduce interference in ion reception.
It is to be understood that some or all of the various embodiments described above may be included in some embodiments.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of steps into only one logical functional division may be implemented in practice in another way, for example, multiple steps may be combined or integrated into another step, or some features may be omitted, or not implemented.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp, wherein the ionization source of the ion mobility spectrometry apparatus is a dual window ultraviolet lamp comprising: the ultraviolet detector comprises a glass tube, a first ultraviolet window, a second ultraviolet window and an excitation electrode, wherein the first ultraviolet window and the second ultraviolet window are respectively arranged at two ends of the glass tube, working gas is filled in the glass tube, the excitation electrode is arranged on the outer wall of the glass tube, the first ultraviolet window is used for ionizing detected gas molecules to generate positive ions, and the second ultraviolet window is used for ionizing detected gas molecules to generate negative ions.
2. The ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp of claim 1, wherein a gas absorber is further disposed within the glass tube.
3. The ion mobility spectrometry apparatus using dual window uv lamp ionization according to claim 1, wherein the outer surface of the second uv window is provided with a metal gauze or film.
4. The ion mobility spectrometry apparatus using dual window uv lamp ionization according to claim 1, wherein the first uv window and the second uv window employ the same vacuum uv transparent material.
5. The ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp according to any one of claims 1 to 4, further comprising: the device comprises a gasification flow dividing cavity, a positive ionization structure and a negative ionization structure, wherein the positive ionization structure is arranged outside the first ultraviolet window, and the negative ionization structure is arranged outside the second ultraviolet window;
the gasification flow dividing cavity is provided with a gas inlet of gas to be detected, and the gas to be detected is respectively conveyed to the positive ionization structure and the negative ionization structure; the positive ionization structure is used for ionizing the gas to be detected under the action of the first ultraviolet window to generate positive ions, receiving the positive ions and generating corresponding electric signals; the negative ionization structure is used for ionizing the gas to be detected under the action of the second ultraviolet window to generate negative ions, and receiving the positive ions to generate corresponding electric signals.
6. The ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp of claim 5, wherein the positive ionization structure comprises: the double-window ultraviolet lamp comprises a positive ionization region, a first ion gate, a positive ion migration region, a first shielding grid and a first Faraday disc, wherein a first ultraviolet window of the double-window ultraviolet lamp is arranged in the positive ionization region, a first air inlet of the positive ionization region is communicated with the gasification diversion cavity, an air outlet of the positive ionization region is arranged on the positive ionization region, the positive ionization region is communicated with the positive ion migration region through the first ion gate which is periodically opened, the ion gate is a pair of parallel metal wires, the ion gate is controlled to be opened and closed by the voltage of the metal wires, the first shielding grid and the first Faraday disc are arranged at one end, far away from the first ion gate, in the positive ion migration region, a second air inlet is arranged at the rear part of the positive ion migration region, and purified migration gas is introduced into the second air inlet when the double-window ultraviolet lamp is used, and out of the gas outlet through the first ion gate.
7. The ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp of claim 6, wherein the negative ionization structure comprises: the double-window ultraviolet lamp comprises an anion ionization region, a second ion gate, an anion migration region, a second shielding grid and a second Faraday disc, wherein a second ultraviolet window of the double-window ultraviolet lamp is arranged in the anion ionization region, a first air inlet of the anion ionization region is communicated with the gasification diversion cavity, an air outlet of the anion ionization region is arranged on the anion ionization region, the anion ionization region is communicated with the anion migration region through the second ion gate which is periodically opened, the ion gate is a pair of parallel metal wires, the ion gate is controlled to be opened and closed by the voltage of the metal wires, the second shielding grid and the second Faraday disc are arranged at one end, far away from the second ion gate, in the anion migration region, the second air inlet is arranged at the rear part of the cation migration region, and purified migration gas is introduced into the second air inlet when the double-window ultraviolet lamp is used, and out of the gas outlet through the second ion gate.
8. The ion mobility spectrometry apparatus for ionization using a dual window ultraviolet lamp of claim 5, further comprising: and the electric signal amplifying circuit is used for amplifying the electric signals generated by the positive ionization structure and the negative ionization structure.
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