CN101949889B - Ion mobility spectrometry detection device for narcotics and explosives - Google Patents

Abstract

The invention discloses a drug explosive ion mobility spectrum detection device, which comprises a device body. The front end of the device body is provided with a sample injector, the rear end of the sample injector is connected with an ion mobility spectrum measuring tube, the ion mobility spectrum measuring tube is connected with a positive and negative electric field high-voltage device, the output end of the ion mobility spectrum measuring tube is connected with a processing device, a power supply device is also arranged in the device body, a positive ion ionization mobility test cavity and a negative ion ionization mobility test cavity are formed in the ion mobility spectrum measuring tube, the front ends of the positive ion ionization mobility test cavity and the negative ion ionization mobility test cavity are connected with the rear end of the sample injector through a Y-shaped throat tube, and the surface of the device body is provided with a sample injection port. The device overcomes the defects of the conventional ion mobility spectrum detection technology, achieves simultaneous test of drug explosives corresponding to positive and negative ions, has complete test and sample injection analysis functions, and can provide multifunctional ion mobility spectrum detection equipment for quickly detecting trace drug explosives for departments such as public security, customs and the like.

Description

Ion mobility spectrometry detection device for narcotics and explosives

technical field

The invention relates to a detection device for narcotics and explosives, in particular to a drug and explosives ion migration spectrum detection device for multi-sample detection and simultaneous analysis of narcotics and explosives in the technical field of substance analysis.

Background technique

Since the molecules of drugs and explosives can generate positive ions and negative ions under the action of the ionization source, and the two move in opposite directions in the same electric field, in order to detect drugs and explosives at the same time, it is required to measure in two different directions of the migration electric field Mobility, so most ion mobility spectrometer testing equipment is intelligent to analyze drugs alone or to analyze explosives alone.

At present, in addition to ion mobility spectrometry drug/explosive detection equipment that only analyzes drugs or explosives, there are some ion mobility spectrometry detection technologies that can detect both drugs and explosives; however, these existing technologies are difficult to continuously analyze drugs in real time and explosives, because they are a class of drugs that are positive ions and explosives that are negative ions are detected on one instrument through time switching technology, and electric fields in different directions are applied at different time periods of the same ion transfer tube to achieve positive , Determination of negative ion mobility, but it cannot continuously analyze drugs and explosives in real time, the mutual interference is large, and it is difficult to add reactants and calibration substances.

There is also a type of drift tube that uses DMS to measure the mass-to-charge ratio of ions. It can add different bias voltages to measure the drift characteristics of positive and negative ions in a rapidly flipping electric field, but the mechanism is not to measure the ion mobility of the substance. Too much bias voltage cannot be arranged to detect more classes of narcotics and explosives.

To sum up, in view of the existing above-mentioned defects, there is a special need for an ion mobility spectrometry detection device for narcotics and explosives to solve the above-mentioned problems.

Contents of the invention

The object of the present invention is to provide an ion mobility spectrometry detection device for narcotics and explosives, which overcomes the defects of the above-mentioned ion mobility spectrometry detection technology, and realizes the simultaneous detection of narcotics and explosives.

The technical problem solved by the present invention can adopt following technical scheme to realize:

An ion mobility spectrometry detection device for narcotics and explosives is characterized in that it includes a device body, a sample injector is arranged at the front end of the device body, and an ion mobility spectrometry tube is connected to the rear end of the sample injector. Positive and negative electric field high voltage devices are connected to the mobility spectrum measurement tube, and the output end of the ion mobility spectrum measurement tube is connected to a processing device for calculating the ion mobility of the sample. The device body is also provided with a power supply for the entire device. A power supply device, the ion mobility spectrometer measuring tube is provided with a positive ion ionization migration test cavity for determining the ion migration time of positive ions and a negative ion ionization migration test cavity for determining the ion migration time of negative ions, and the positive and negative electric field high voltage The device generates a positive high voltage and applies it to the positive ion ionization migration test chamber to generate a positive migration electric field. The positive and negative electric field high voltage device generates a negative high voltage and applies it to the negative ion ionization migration test chamber to generate a negative migration electric field. The front end of the cavity and the negative ion ionization migration test cavity is connected to the rear end of the sample injector through a Y-shaped throat, and a sample inlet is arranged on the surface of the device body, and the sample inlet communicates with the sample injector .

In one embodiment of the present invention, the output end of the ion mobility spectrometry tube is connected to the processing device through an ion current high resistance amplifier.

In one embodiment of the present invention, the device body is also provided with an alarm display for sound and light alarm and data display.

In one embodiment of the present invention, the device body is also provided with a gas path providing a stable pressure field for carrier gas and migration.

In one embodiment of the present invention, the inlet is a slit-like inlet.

In one embodiment of the present invention, the sample injector includes a sample gasification chamber for placing samples, a heating layer and a thermal insulation layer, the heating layer is arranged outside the sample gasification chamber, and the thermal insulation layer layer is arranged on the outside of the heating layer, the rear end of the sample gasification chamber is connected to the bottom end of the Y-shaped throat, and the two top ends of the Y-shaped throat are respectively connected to the ionization inlet at the rear end of the sampler , and connected to the positive ion ionization migration test cavity and the negative ion ionization migration test cavity of the ion mobility spectrometry tube through the ionization inlet, and the ionization inlet is respectively provided with a pump gas port.

Further, a high-temperature throat heater is provided on the outside of the Y-shaped throat to keep the sample in the throat in a gaseous state.

In one embodiment of the present invention, the ion mobility spectrometry measurement tube includes a measurement tube body, and a first migration cylinder with a positive ion ionization migration test cavity and a negative ion ionization migration test cavity are arranged in parallel in the measurement tube body. The second migration cylinder of the cavity, the outside of the measuring tube is provided with a heater and the insulation layer in sequence, the first migration cylinder is provided with a first ionization chamber, and the first ionization chamber is connected to the first ionization chamber through the first potential gate. The positive ion ionization migration test chamber is connected, and the rear end of the positive ion ionization migration test chamber is connected with a first output interface through an ion receiver; the second migration cylinder is provided with a second ionization chamber, and the second The ionization chamber is connected with the negative ion ionization migration test cavity through the second potential gate, and the rear end of the negative ion ionization migration test cavity is connected with the second output interface through the ion receiver; the first output interface and the second output interface are connected with The processing device is connected.

In one embodiment of the present invention, the processing device is a computer that calculates the mobility of a pair of dual-path ions and compares the sample library, and controls and calculates the positive and negative ion tests of the ion mobility spectrometry tube, The detection of drugs or explosives consistent with the migration spectrum of the sample library will give an alarm through the alarm display.

The drug and explosives ion mobility spectrometry detection device of the present invention overcomes the defects existing in the existing ion mobility spectrometry detection technology, has a novel design and comprehensive functions, and achieves simultaneous testing of drug and explosives corresponding to positive and negative ions through rational design and combination of internal structures , testing sample introduction and analysis functions are complete, can provide multifunctional ion mobility spectrometry to quickly detect trace narcotics and explosives investigation equipment for departments such as public security and customs, and realize the purpose of the present invention.

The ion mobility spectrometry detection device for narcotics and explosives of the present invention realizes the object of the present invention.

The features of the present invention can be clearly understood by referring to the drawings of the present invention and the detailed description of the following preferred embodiments.

Description of drawings

Fig. 1 is the internal structural diagram of the drug explosive ion mobility spectrometry detection device of the present invention;

Fig. 2 is the structural representation of injector of the present invention;

Fig. 3 is a schematic structural view of the ion mobility spectrometer measuring tube of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

As shown in Figure 1, the drug and explosives ion mobility spectrometry detection device of the present invention includes a device body 100, the front end of the device body 100 is provided with a sampler 200, and the rear end of the sampler 200 is connected with an ion mobility spectrometer measuring tube 300 , the ion mobility spectrometer measuring tube 300 is connected with a positive and negative electric field high voltage device 400, the output end of the ion mobility spectrometry measuring tube 300 is connected with the processing device 600 through an ion current high resistance amplifier 500, and the processing device 600 is used to calculate the For ion mobility, the device body 100 is also provided with a gas path 700 that provides a stable pressure field for carrier gas and migration, an alarm display 800 that performs sound and light alarms and displays data, and a power supply device 900 that supplies power to the entire device.

The surface of the device body 100 is provided with a sample inlet 110. The sample inlet 110 communicates with the sample injector 200. The sample inlet 110 is located on the surface of the device body 100. It can absorb air and insert a test paper that has been wiped to provide an ion mobility spectrometry tube. 300 samples; in the present embodiment, the sample inlet 110 is a slit-like sample inlet.

In this embodiment, the processing device 600 is a computer that calculates the mobility of a pair of dual-way ions and compares the sample library, and controls and calculates the positive and negative ion tests of the ion mobility spectrometry tube 300, and detects the difference between the positive and negative ions in the sample library. Narcotics or explosives with the same migration spectrum will be alarmed through the alarm display 800 .

As shown in Figure 2, the sample injector 200 includes a sample gasification chamber 210 for placing a sample, a heating layer 220, and an insulating layer 230. The heating layer 220 is arranged outside the sample vaporizing chamber 210, and the insulating layer 230 is arranged on the heating Outside the layer 220, the rear end of the sample gasification chamber 210 is connected to the bottom end of the Y-shaped throat 240, and the two top ends of the Y-shaped throat 240 are respectively connected to the ionization inlet 250 at the rear end of the sample injector 200, and pass through the ionization inlet 250. It is connected with the ion mobility spectrometry tube 300, and the ionization inlet 250 is respectively provided with a pump gas port 260; the outside of the Y-shaped throat 240 is provided with a high-temperature throat heater 270 to keep the sample in the throat in a gas state.

As shown in Figure 3, the ion mobility spectrometer measurement tube 300 includes a measurement tube body 310, which is provided with a positive ion ionization migration test cavity 320 for measuring the ion migration time of positive ions and a test cavity 320 for measuring the ion migration time of negative ions in the measurement tube body 310. The negative ion ionization migration test chamber 330, the positive and negative electric field high voltage device 400 generates positive high voltage and applies it to the positive ion ionization migration test chamber 320 to generate a positive migration electric field, and the positive and negative electric field high voltage device 400 generates negative high voltage and applies it to the negative ion ionization migration test chamber 330 to generate a negative migration electric field; the first migration cylinder 311 with a positive ion ionization migration test cavity 320 and the second migration cylinder 312 with a negative ion ionization migration test cavity 330 are arranged in parallel in the measurement tube body 310, and the measurement tube A heater 340 and an insulating layer 350 are provided in sequence on the outside of the body 310, and the first migration cylinder 311 is provided with a first ionization chamber 360, which is connected to the positive ion ionization migration test chamber 320 through a first potential gate 370, The rear end of the positive ion ionization migration test cavity 320 is connected with the first output interface 314 through the ion receiver 313; the second migration cylinder 312 is provided with a second ionization chamber 380, and the second ionization chamber 380 is connected to The negative ion ionization migration test chamber 330 is connected, and the rear end of the negative ion ionization migration test chamber 330 is connected with the second output interface 316 through the ion receiver 315; the first output interface 314 and the second output interface 316 are connected with the processing device 600 .

The sample injector 200 is connected with the positive ion ionization migration test cavity 320 and the negative ion ionization migration test cavity 330 of the ion mobility spectrometry tube 300 through a Y-shaped throat 240, and various drugs and explosives samples enter the sample injector 200 are respectively fed into the positive ion ionization migration test cavity 320 and the negative ion ionization migration test cavity 330 through the Y-shaped throat 240, and the ion migration time of positive ions of drugs or negative ions of explosives is measured at the same time.

When in use, the sample is inhaled through the sample inlet 110 and the gasified sample gas enters the positive ion ionization migration test chamber 320 and the negative ion ionization migration test chamber 330 of the ion mobility spectrometer measuring tube 300 to measure the ion migration. The positive and negative electric field high voltage device 400 outputs two positive and negative electric field high voltages and two sets of electric field gate opening pulses, which are added to the positive ion ionization migration test chamber 320 and the negative ion ionization migration test chamber 330 to make the ionized sample ions pass through the instantaneous gate open pulse The time when the ions arrive at the terminal can be measured by entering the positive and negative migration electric fields. The gas circuit 700 provides a stable pressure field for carrier gas and migration. The ion peak signal representing the migration time is amplified by the ion current high-impedance amplifier 500 and sent to the processing device 600 to calculate the test value. The sample ion mobility rate is compared with the sample mobility database in the instrument for consistency. If it is consistent with which kind of drug or explosive sample data, the alarm display 800 will alarm and display the data with sound and light, and the power supply unit 900 will provide power for the system of the device.

Inside the ion mobility spectrometry tube 300, the sample is sucked in or inserted into the sample gasification chamber 210 in the sample injector 200 by wiping the article with the analysis test paper 120 or sucking air on the article, and the pump gas port 260 of the sample injector 200 is generated by an air pump. The carrier gas makes the negative pressure in the sample gasification chamber 210, and the sample gasification chamber 210 vaporizes the sample at high temperature due to the heating layer 220 and the insulation layer 230, and the sample gas enters the ion migration through the Y-shaped throat 240 under the action of the carrier gas. The ionization inlet 250 of the spectrum measurement tube 300 is ionized to the first ionization chamber 360 and the second ionization chamber 380, the heater 340 keeps the sample in the throat tube in a gas state, and the ionized ions are under the action of the first potential gate 370 and the second potential gate 390 Enter the positive ion ionization migration test chamber 320 and the negative ion ionization migration test chamber 330 at the moment of pulse opening to measure the ion migration rate, and the ion receiver 313 and the ion receiver 315 receive the migrated ions from the first output interface 314 and the second output interface 316 The output is sent to the processing device 600 to calculate the ion migration rate to determine whether it is contraband.

The positive ion ionization migration test cavity 320 and the negative ion ionization migration test cavity 330 require two sets of measurement tubes 310 to be set outside the first migration cylinder 311 and the second migration cylinder 312 for electromagnetic shielding, heater 340 and insulation layer 350 Keep the ion mobility test chamber at a constant high temperature to meet the external conditions of the ion mobility test in the internal mobility region.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and improvements fall within the scope of the claimed invention, which is defined by the appended claims and their equivalents.

Claims (8)

1. An ion mobility spectrometry detection device for drug explosives is characterized in that it comprises a device body, the front end of the device body is provided with a sample injector, and the rear end of the sample injector is connected with an ion mobility spectrometry measuring tube, so The ion mobility spectrometry tube is connected with a positive and negative electric field high voltage device, the output end of the ion mobility spectrometer tube is connected with a processing device for calculating the ion mobility of the sample, and the device body is also provided with a A power supply device for supplying power, the ion mobility spectrometry measuring tube is provided with a positive ion ionization migration test cavity for determining the ion migration time of positive ions and a negative ion ionization migration test cavity for determining the ion migration time of negative ions, the positive and negative The electric field high voltage device generates a positive high voltage and applies it to the positive ion ionization migration test cavity to generate a positive migration electric field. The front ends of the migration test cavity and the negative ion ionization migration test cavity are connected to the rear end of the sample injector through a Y-shaped throat, and a sample inlet is arranged on the surface of the device body, and the sample inlet is connected to the sample injection port. Device Unicom; The sample injector includes a sample gasification chamber for placing samples, a heating layer and an insulation layer, the heating layer is arranged outside the sample gasification chamber, and the insulation layer is arranged outside the heating layer , the rear end of the sample gasification chamber is connected to the bottom end of the Y-shaped throat, and the two top ends of the Y-shaped throat are respectively connected to the ionization inlet at the rear end of the sampler, and are connected to the ionization inlet through the ionization inlet. The positive ion ionization migration test cavity of the migration spectrum measurement tube is connected with the negative ion ionization migration test cavity, and the ionization inlets are respectively provided with pump gas ports. 2. The ion mobility spectrometry detection device for narcotics and explosives according to claim 1, wherein the output end of the ion mobility spectrometry measuring tube is connected to the processing device through an ion current high resistance amplifier. 3. The ion mobility spectrometry detection device for narcotics and explosives as claimed in claim 1, characterized in that, an alarm display for sound and light alarm and data display is also arranged in the device body. 4. The ion mobility spectrometry detection device for narcotics and explosives according to claim 1, characterized in that, the device body is also provided with a gas path that provides a stable pressure field for carrier gas and migration. 5 . The ion mobility spectrometry detection device for narcotics and explosives as claimed in claim 1 , wherein the inlet is a slit-like inlet. 6 . 6. The ion mobility spectrometry detection device for narcotics and explosives as claimed in claim 1, wherein a high-temperature throat heater is arranged on the outside of the Y-shaped throat to keep the sample in the throat in a gaseous state. 7. drug explosives ion mobility spectrometry detection device as claimed in claim 1, is characterized in that, described ion mobility spectrometry measuring tube comprises measuring tube body, is provided with in parallel in described measuring tube body and has positive ion ionization migration test cavity The first migration cylinder of the body and the second migration cylinder with a negative ion ionization migration test chamber, the outside of the measurement tube is provided with a heater and the insulation layer in sequence, and the first migration cylinder is provided with a first ionization chamber , the first ionization chamber is connected with the positive ion ionization migration test chamber through the first potential gate, and the rear end of the positive ion ionization migration test chamber is connected with the first output interface through the ion receiver; the second migration The cylinder body is provided with a second ionization chamber, the second ionization chamber is connected to the negative ion ionization migration test chamber through the second potential gate, and the rear end of the negative ion ionization migration test chamber is connected to the second output interface through the ion receiver ; The first output interface and the second output interface are connected to the processing device. 8. The drug and explosives ion mobility spectrometry detection device as claimed in claim 1, wherein the processing device is a computer that calculates the mobility of a pair of two-way ions and compares the sample library, and the ion mobility of the ion The positive and negative ion tests of the migration spectrum measurement tube are controlled and calculated, and the detection of drugs or explosives consistent with the migration spectrum of the sample library will give an alarm through the alarm display.

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