CN116148337A - Tandem type environment compensation type high-field asymmetric waveform ion mobility spectrometry - Google Patents
Tandem type environment compensation type high-field asymmetric waveform ion mobility spectrometry Download PDFInfo
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- CN116148337A CN116148337A CN202211425586.7A CN202211425586A CN116148337A CN 116148337 A CN116148337 A CN 116148337A CN 202211425586 A CN202211425586 A CN 202211425586A CN 116148337 A CN116148337 A CN 116148337A
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- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
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Abstract
The invention relates to a serial environment compensation type high-field asymmetric waveform ion mobility spectrometry, which comprises a cavity unit structure, a low-current detection electrode, a low-current detector and a bias electrode, wherein the cavity unit structure is arranged in a closed manner, the cavity unit structure is formed by a substrate, one end of the cavity unit structure is provided with an air inlet, the other end of the cavity unit structure is provided with an air outlet, and the cavity structure is sequentially provided with an ionization region containing an ionization source, a first separation electrode, a second separation electrode, the low-current detection electrode, the low-current detector connected with the low-current detection electrode and the bias electrode along the direction from the air inlet to the air outlet; the first separation electrode and the second separation electrode are arranged up and down correspondingly, and the weak current detection electrode and the bias electrode are arranged up and down correspondingly. The serial environment compensation type high-field asymmetric waveform ion mobility spectrometry adopts a serial mode, effectively reduces the influence of the change of natural conditions such as ambient temperature, humidity, atmospheric pressure and the like on detection current, and improves the environment adaptability and the stability of an instrument based on the technical principle of high-field non-symmetric waveform ion mobility spectrometry.
Description
Technical Field
The invention relates to the technical field of VOCs monitoring, in particular to a serial environment compensation type high-field asymmetric waveform ion mobility spectrometry.
Background
Along with the development of industry, environmental pollution is also continuously aggravated, and has great influence on human survival, and the environmental pollution has become devil of phagocytic economic achievements. Air pollution is the most common type of pollution other than water pollution, and volatile organic compounds are the more common pollutants in air pollution. Ion mobility spectrometry is a mainstream technology that can be used for gas detection. The high-field asymmetric waveform ion mobility spectrometry forms an ion filter through the action of alternating high and low electric fields, so that interference gas molecules and target molecules are effectively separated, the detection selectivity and the signal to noise ratio are effectively improved, and wide importance is placed on the field of environment detection. However, in practical tests, the ion mobility in a high electric field is affected by temperature, humidity and atmospheric pressure, so that the measurement accuracy of the substance to be measured is affected.
The high-field asymmetric waveform ion mobility spectrometry is a brand new detection technology developed in the 90 s, the working principle is that the ion mobility is subjected to nonlinear change under a high-low electric field to realize ion separation and identification, and the technology has the advantages of simple structure, easiness in microminiaturization, high detection speed and the like, and is widely applied to the fields of environment, anti-terrorism, public safety and the like. In recent years, along with the expansion of the technology in the field of trace substance detection, the requirement on sensitivity in the use process is higher and higher. In patent cn201810578381.X, in the high field asymmetric waveform example mobility spectrum, sensitivity is mainly determined by ion source ionization efficiency and ion separation region loss ratio. In 2012, U.S. Pat. No. USB8263930B2 proposed a method for improving sensitivity of high-field asymmetric waveform ion mobility spectrometry by using a flow field and an electric field, and reducing ion recombination probability by setting an ion mobility electric field at the rear end of a separation zone and increasing carrier gas flow, but it may lead to complexity of structure and manufacture.
In actual use, the temperature, humidity, and atmospheric pressure at the time of field measurement may be different from the environment at the time of calibration of the instrument in the laboratory, resulting in deviation of the measurement result from the actual target concentration, and misalignment of the instrument, but no related patent is currently discussed about environmental suitability of the device.
Disclosure of Invention
The serial environment compensation type high-field asymmetric waveform ion mobility spectrometry provided by the invention can improve the adaptability and stability of the detection technology to the environment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the serial environment compensation type high-field asymmetric waveform ion mobility spectrometry comprises a cavity unit structure which is arranged in a closed mode, wherein the cavity unit structure is composed of a substrate, one end of the cavity unit structure is provided with an air inlet, and the other end of the cavity unit structure is provided with an air outlet;
the cavity structure is sequentially provided with an ionization region containing an ionization source, a first separation electrode, a second separation electrode, a weak current detection electrode, a weak current detector connected with the weak current detection electrode and a bias electrode along the direction from the air inlet to the air outlet;
the first separation electrode and the second separation electrode are arranged up and down correspondingly, and the weak current detection electrode and the bias electrode are arranged up and down correspondingly.
Further, the device comprises two cavity unit structures which are connected in series.
Further, the substrate is made of boronized glass.
Furthermore, the first ion separation electrode and the second ion separation electrode are manufactured by adopting a magnetron sputtering gold target.
According to the technical scheme, the serial environment compensation type high-field asymmetric waveform ion mobility spectrometry adopts a serial mode, so that the influence of the change of natural conditions such as ambient temperature, humidity and atmospheric pressure on detection current is effectively reduced, and the environment adaptability and the stability of an instrument based on the technical principle of the high-field non-waveform ion mobility spectrometry are improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the compensation principle of an embodiment of the present invention;
FIG. 3 is a schematic diagram of the environment and voltage relationship of an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
As shown in fig. 1, a serial environment-compensated high-field asymmetric waveform ion mobility spectrometry according to an embodiment of the present invention includes: the high-field asymmetric waveform ion mobility spectrometer comprises a cavity structure formed by a high-field asymmetric waveform ion mobility spectrometer substrate 100, wherein one end of the cavity structure is provided with an air inlet 1 for entering a mixture of migration gas and sample gas, the other end of the cavity structure is provided with an exhaust gas port 9 for exhausting, and an ionization region of an ionization source 3, a first separation electrode 4, a second separation electrode 5, a weak current detection electrode 6, a weak current detector 7 connected with the weak current detection electrode 6 and a bias electrode 8 are sequentially arranged in the cavity structure of the high-field asymmetric waveform ion mobility spectrometer from the air inlet direction to the air outlet direction. The first separation electrode 4 and the second separation electrode 5 are arranged up and down correspondingly, and the weak current detection electrode 6 and the bias electrode 8 are arranged up and down correspondingly;
the substrate 100 is made of boronized glass, and the first ion separation electrode 4 and the second ion separation electrode 5 are made of magnetron sputtering gold targets.
The sample gas and the migration gas adopt an air pump or a fan to drive air intake.
The high-field asymmetric waveform ion mobility spectrometry detection principle of the embodiment of the invention is as follows: the carrier gas enters the device from the left air inlet 101 in fig. 1, and after the target and the substrate enter the ionization region through the carrier gas inlet, the target and the substrate are ionized into an ion form by the ion source 3, so as to obtain an ion group 2, and the ion group 2 reaches the separation region along with the carrier gas. The high-frequency voltage and the scanning voltage are respectively applied to the first ion separation electrode 4 and the second ion separation electrode 5, the ion clusters are screened through the generated electric field, and the ions vibrate up and down in the generated high-low mixed electric field: the square matrix ions (a) and the round matrix ions (c) are drawn to the electrode surface for neutralization, the triangular target characteristic ions (b) pass through the separation area, reach the detection area and are drawn by the bias electrode 8 of oiling direct-current voltage, and are captured by the weak current detection electrode for detection.
Under the action of the scanning direct-current bias voltage applied between the first separation electrode 4 and the second separation electrode 5, the scanning direct-current bias voltage is finally captured by the weak current detection electrode 6, and the current is converted into voltage measurement, so that the relation between the concentration of the target object and the voltage is established.
The invention uses a circuit schematic diagram of the compensation principle of a series mode of two module units as shown in fig. 2, wherein one is a detection module unit and the other is a compensation module unit. During detection, air containing a target detection object (particulate matters or gas) in one path of gas passes through a detection module according to a certain flow s1, the target detection object is ionized in an ionization chamber, finally reaches a detection area through an ion migration area added with high-frequency voltage, is captured by a detection electrode, and is mapped and converted into voltage V1 through an electronic circuit; the other path of air gas without the target detection object passes through the compensation module according to a certain flow s2, the same air is ionized in the ionization chamber, finally reaches the detection area through the ion migration area added with high-frequency voltage, is captured by the detection electrode, and is mapped and converted into voltage V2 through the electronic circuit. Since the two modules are in the same environment, if s1=s2, the temperature, humidity and atmospheric pressure are the same when no object exists, so that the influence of the detection voltage caused by these factors is the same, that is, the influence of a certain environment on the voltage is the same and synchronous, and is respectively denoted as V1 and V2, as shown in fig. 3, in the same environment, the detection voltage of the detection module is V3 when the object exists, the signal increase caused by the object is regarded as V3-V1, that is, v3+v2, and when the external environment changes, the detection voltages of the detection module unit and the compensation unit also change, but the detection signal change of the instrument caused by subtracting the environment change can be calculated, so that the effect of environmental compensation is achieved, and the environmental adaptability and stability of the instrument are improved. Further, when s1+.s2, the compensation formula becomes v3+s1/s2×v2.
In summary, the key point of the present invention is that two units are connected in series. The units with the protection points connected in series can be two independent units for ionization, migration and detection as shown in fig. 1, and the two units can be equal in flow rate or not.
For realizing the compensation gas circuit without target detection objects, the filter can be used for filtering out the particles in the gas when the concentration of the particles is measured, a Nafion tube can be used for measuring certain gases, and air or other close-component gas can be used for approximate replacement.
The embodiment of the invention can improve the environmental adaptability and stability of the instrument.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The serial environment compensation type high-field asymmetric waveform ion mobility spectrometry comprises a cavity unit structure which is arranged in a closed manner, wherein the cavity unit structure is composed of a substrate, one end of the cavity unit structure is provided with an air inlet, the other end is provided with an air outlet,
the cavity structure is sequentially provided with an ionization region containing an ionization source, a first separation electrode, a second separation electrode, a weak current detection electrode, a weak current detector connected with the weak current detection electrode and a bias electrode along the direction from the air inlet to the air outlet;
the first separation electrode and the second separation electrode are arranged up and down correspondingly, and the weak current detection electrode and the bias electrode are arranged up and down correspondingly.
2. The tandem ambient compensation type high-field asymmetric waveform ion mobility spectrometry of claim 1, wherein: comprises two cavity unit structures which are connected in series.
3. The tandem ambient compensation type high-field asymmetric waveform ion mobility spectrometry of claim 1, wherein: the substrate is made of boride glass.
4. The tandem ambient compensation type high-field asymmetric waveform ion mobility spectrometry of claim 1, wherein: the first ion separation electrode and the second ion separation electrode are manufactured by adopting a magnetron sputtering gold target.
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| CN202211425586.7A CN116148337A (en) | 2022-11-15 | 2022-11-15 | Tandem type environment compensation type high-field asymmetric waveform ion mobility spectrometry |
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| CN202211425586.7A CN116148337A (en) | 2022-11-15 | 2022-11-15 | Tandem type environment compensation type high-field asymmetric waveform ion mobility spectrometry |
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