CN101819179B - Single-pipe double-chamber suction test paper dual-sampling cation and anion mobility spectrum dual measuring pipe - Google Patents

Abstract

The invention aims to provide a single-pipe double-chamber suction test paper dual-sampling cation and anion mobility spectrum dual measuring pipe. A sample injector has a slit-shaped flat injection port, and the injection port generates a negative pressure under the action of a sampling pump so that air in the front can be absorbed into the sample injector and a piece of analysis test paper can be inserted into the sample injector to extract substances adhered to the test paper after the test paper is scrubbed. A first ionic emigration area and a second ionic emigration area are arranged in a mobility spectrum measuring tube body, so the dual measurement of the cations and anions of different substances such as poisons and explosives can be completed with high sensitivity in real time, a plurality of mixed substances can be analyzed and a large number of contraband wares can be compared simultaneously. The single-pipe double-chamber suction test paper dual-feeding cation and anion mobility spectrum dual measuring pipe has novel design, a rational structure and multiple functions and realizes the aim of the invention.

Description

A single-tube double-chamber suction test paper double-injection positive and negative ion mobility spectrometry dual-measurement tube

technical field

The invention relates to an ion mobility measurement tube, in particular to a single-tube double-cavity suction test paper double-injection positive and negative ion mobility spectrometry tube for simultaneous ion mobility spectrometry analysis of positive and negative ions belonging to drug explosives. It belongs to the technical field of material analysis.

Background technique

Most of the existing ion mobility measurement tubes are single-measure positive ion or negative ion mobility measurement tubes, and the instruments made of them are only for positive ion drug detection or negative ion explosive detection, and their functions are single. ; If it is necessary to measure the positive ion and negative ion mobility of suspicious samples at the same time, when judging whether the sample is a drug or explosive, two different instruments are required to test the positive ion and negative ion mobility respectively, which is very troublesome, and there are few samples that need to be tested. At the same time, it is impossible to test the mobility of positive ions and negative ions separately; in addition, there is also a time-switching method of adding positive high voltage and negative high voltage to the single tube to alternately measure the mobility of positive ions and negative ions. It is possible to detect drugs and explosives in a single instrument, but if positive and negative pulse high voltages are applied to the same migration area of a measuring tube, the positive and negative ion movements will interfere with each other seriously, and it is difficult to calibrate different reference objects, and the noise is large. Sensitivity is affected; there is also a mass-to-charge ratio drift tube called DMS, which can measure the drift characteristics of positive and negative ions by adding different bias voltages in the pulsed electric field, but the mechanism is not to measure the mobility spectrum characteristics of material ions. And because too many bias voltages cannot be arranged in one cycle, so many narcotics or explosives cannot be detected.

At present, most of the sample injectors of existing analytical instruments and test sensors form a complex multi-component system. The sample injectors capable of heating vaporized samples do not include the aspiration analysis and test paper analysis through a single injection port, and the aspiration The carrier gas is fed back to the injection port to increase the intake of the sample. It is made into one, and there is a lack of efficient compact one-piece aspirating test paper double injector; other places have no substance positive and negative ion mobility detection and feedback-type aspirating test paper double feeding Sample made into an integrated test device.

Contents of the invention

The purpose of the present invention is to provide a single-tube, double-cavity aspirating test paper, double-injection positive and negative ion mobility spectrometer double-measurement tube, which overcomes the above-mentioned shortcomings in the prior art and realizes simultaneous and continuous detection of drug explosives.

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

A single-tube double-cavity suction test paper double-injection positive and negative ion mobility spectrometer dual-measurement tube, which includes a mobility spectrum measurement tube body, is characterized in that the front end of the mobility spectrum measurement tube body is provided with a The sample injector for analysis and test paper wiping analysis, the first ion mobility area and the second ion mobility area respectively used for positive ion and negative ion mobility detection are arranged in the said mobility spectrum measuring tube, the rear end of said sample injector It communicates with the front ends of the first ion transfer region and the second ion transfer region through a double-pass throat, and a first ionization chamber is arranged between the front end of the first ion transfer region and the rear end of the double-pass throat. , a second ionization chamber is arranged between the front end of the second ion migration region and the rear end of the double-pass throat, and a potential migration gate is arranged at the front ends of the first ion migration region and the second ion migration region, The rear end of the first ion migration area and the second ion migration area is provided with an ion collection plate, and the ion collection plate is connected to the signal output end arranged at the rear end of the mobility spectrum measurement tube body through the ion current detector, and the The first ion chamber migration area and the second ion chamber migration area are respectively provided with a group of electrode needles, and one end of the electrode needles is arranged on the first ion chamber migration area and the second ion chamber migration area, and the electrode needles The other end connects the electric field voltage of testing positive ions and testing negative ions through electrode leads.

In one embodiment of the present invention, the front end of the injector is provided with a single narrow slit flat sample inlet, and the injector is provided with an air nozzle connected to the suction end of the sample pump; When the sampling pump is working, there is a negative pressure in the sampling port of the sampler, and the gas in front of the sampling port is drawn into the narrow slit to realize the suction analysis of the sample, and the sample is inserted into the narrow slit of the sampling port after wiping the sample with an appropriate size test paper , to realize the injection analysis of samples attached to test paper extracted by the sample injector.

Further, a feedback air pipe is also provided in the sampler, the rear end of the feedback air pipe is connected to the exhaust end of the sampling pump, the front end of the feedback air pipe is provided with a blowing port, and the blowing port is set Below the sample inlet; provide secondary suction of residual sample gas and blow the surface of the object to help absorb particulate samples and improve sample injection efficiency.

In one embodiment of the present invention, the sample injector is made of metal or ceramics with high thermal conductivity, and the outside of the sample injector is provided with a heating insulation layer wrapped with a constantan heating sheet and wrapped with a high-temperature heat-resisting material; During the analysis, it is energized and heated to a high temperature capable of analyzing air particles and vaporized test paper samples to form a sample gas for ionization analysis.

In one embodiment of the present invention, a filter membrane for blocking dust and water vapor is arranged between the rear end of the sampler and the double-way throat; the airflow movement of the sampler can press the filter membrane to deliver the sample gas and The filter membrane enters the first ion migration region and the second ion migration region from the double-pass throat, and the double-pass throat allows the sample gas to enter the first ion migration region and the second ion migration region uniformly for ion mobility detection.

In one embodiment of the present invention, the sample injector is fixed on the front end of the mobility spectrum measurement tube through a fixing ring.

In one embodiment of the present invention, a heating insulation jacket is coated on the outside of the migration spectrum measuring tube.

In one embodiment of the present invention, the electrode leads are connected to the electric field voltage of the test positive ions and the test negative ions through the electric field high-voltage plug.

The single-tube double-chamber air-absorbing test paper of the present invention has double-injection positive and negative ion mobility spectrometry tubes. In the sample injector, analysis test paper can be inserted to extract the attached substances on the test paper after wiping. The first ion migration area and the second ion migration area are set in the migration spectrum measurement tube to complete the dual positive and negative ions of different types of substances such as drugs and explosives in real time. The test has high sensitivity, can analyze mixed multi-substances at the same time, compares a large number of contraband libraries, has novel design, reasonable structure and complete functions, and realizes the purpose 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 structural representation of double-injection positive and negative ion mobility spectrometer double measuring tubes of single-tube double-cavity suction test paper of the present invention;

Fig. 2 is the internal structure schematic diagram of double-injection positive and negative ion mobility spectrometer double measuring tubes of single-tube double-cavity suction test paper of the present invention;

Fig. 3 is a schematic front view of the double-injection positive and negative ion mobility spectrometry tubes of the single-tube double-cavity aspirating test paper 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 Fig. 1 and Fig. 2, the double-injection positive and negative ion mobility spectrometry tubes of the present invention include a single-tube double-cavity suction test paper double-injection tube, which includes a mobility spectrum measurement tube body 100, and the front end of the mobility spectrum measurement tube body 100 is provided with The sample injector 200 is provided with a signal output port 300 at the rear end of the mobility spectrum measurement tube body 100 .

In this embodiment, the front end of the sample injector 200 is provided with a single narrow slit flat sample inlet 210, and the slit of the sample inlet 210 is convenient for inserting analysis test paper. The air nozzle 220 connected to the gas end; when the sampling pump is working, the air gap channel 230 of the sampler connected to the sampling port 210 makes the interior of the sampling port 210 of the sampler 200 negative pressure to reach the extraction port 210 before the air sucks into the slit to realize the suction analysis of the sample, and after wiping the sample with a test paper of an appropriate size, insert it into the slit of the sample inlet 210 to realize the sample injection analysis of the sample attached to the test paper extracted by the sample injector 200.

At the same time, a feedback air pipe 240 is also provided in the sampler 200, the rear end of the feedback air pipe 240 is connected to the exhaust end of the sampling pump, the front end of the feedback air pipe 240 is provided with a blowing port 241, and the blowing port 241 is arranged on the sample inlet. Below 210 (see FIG. 3 ), the feedback hot air flow is blown out at the blowing port 241 so that the feedback air flow is inhaled and blown on the surface of the object for the second time, helping to absorb particulate samples, air suction analysis, and improving sampling efficiency.

In an embodiment, the sample injector 200 is made of metal or high thermal conductivity ceramics, and the outside of the sample injector 200 is provided with a heating insulation layer 250 wrapped with a constantan heating sheet and coated with a high-temperature-resistant thermal insulation material; It can analyze the high temperature of air particles and vaporized test paper samples to form sample gas for ionization analysis.

In this embodiment, the sample injector 200 is fixed on the front end of the mobility spectrum measuring tube 100 through a fixing ring 260 .

The first ion mobility region 110 and the second ion mobility region 120 respectively used for positive ion and negative ion mobility detection are arranged in the mobility spectrum measurement tube body 100, and the rear end of the sampler 200 is connected to the first ion mobility region through a double-pass throat 400. The ion migration area 110 communicates with the front end of the second ion migration area 120, a first ionization chamber 130 is arranged between the front end of the first ion migration area 110 and the rear end of the double-pass throat pipe 400, and the front end of the second ion migration area 120 A second ionization chamber 140 is provided between the rear end of the two-way throat pipe 400, a first potential transfer gate 111 is provided at the front end of the first ion transfer region 110, and an ion collection gate 111 is provided at the rear end of the first ion transfer region 110. Disk 112, the front end of the second ion migration area 120 is also provided with a potential migration gate 121, the rear end of the second ion migration area 120 is provided with an ion collection disk 122, and the ion collection disk 112 is connected to the mobility spectrum through an ion current detector 150. The signal output end 300 at the rear end of the measurement tube body 100, and the ion collection plate 122 are connected to the signal output end 300 arranged at the rear end of the mobility spectrum measurement tube body 100 through the ion current detector 160. To realize ion migration and detect positive ions, the ionization chamber 130 , the potential migration gate 111, the first ion migration region 110 and the ion collection plate 112 are applied with a voltage from high to low, to detect negative ions, the ionization chamber 140, the potential migration gate 121, the second ion migration region 120 and the ion collection plate 122 need to be applied From low to high voltage, the ions move and migrate under the force of the electric field.

A group of electrode needles 131 are arranged in the first ionization chamber 130 and the first ion migration region 110, and one end of the electrode needles 131 is arranged on electrodes such as the first ionization chamber 130, and the other end of the electrode needles 131 is connected to test positive ions through the electrode lead 500. Or test the electric field voltage of negative ions, a group of electrode needles 141 are arranged in the second ionization chamber 140 and the second ion migration region 120, and one end of the electrode needles 141 is arranged on the electrodes such as the second ionization chamber 140, and the other end of the electrode needles 141 passes through The electrode lead 500 is connected to the electric field voltage of negative ions or positive ions. In the present embodiment, the electrode lead 500 is connected to the electric field voltage of testing positive ions and testing negative ions through the electric field high-voltage plug 600; On the body 100, the electrode needle 141 is fixed on the mobility spectrum measurement tube body 100 through the electrode cap 142.

In this embodiment, a filter membrane 270 for blocking dust and water vapor is arranged between the rear end of the sampler 200 and the double-way throat 400; , the sample gas is formed at a high temperature, and under the action of the sample pump, the synthesis gas flow presses the filter membrane 270 located behind the sample injector 200, so that the sample gas passes through the filter membrane 270 and enters the first ion transfer region 110 and the The second ion migration area 120 and the double-pass throat 400 allow the sample gas to enter the first ion migration area 110 and the second ion migration area 120 uniformly for ion mobility detection.

The sample molecules introduced by the double-way throat 400 are ionized into ions through the first ionization chamber 130 and the second ionization chamber 140, the drug loses electrons and becomes positive ions, and the explosives attach electrons to become negative ions. And under the action of electric field force, the first ion migration area 110 that enters the positive ion migration moves toward the ion collection plate 112 or the second ion migration area 120 that the negative ions migrate moves toward the ion collection plate 122. According to the instantaneous reference door opening time and the length of the migration area, the migration The ion spectrum signal obtained by the signal output terminal 300 at the rear end of the spectrum measurement tube body 100 corresponds to the time when the ions run to the end of the migration area, and the ion mobility of the corresponding sample substance can be calculated by testing, and compared with certain substances (such as drug explosives) Ion mobility standard values can be completed to determine whether drugs and explosives.

In this embodiment, a heating insulation jacket 170 is covered on the outside of the migration spectrum measurement tube body 100 . Reach a constant temperature state, so that the internal airflow and air pressure of the migration spectrum measurement tube 100 are in a state of constant flow and constant pressure, which is convenient for correct testing;

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. two survey of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum managed; It comprises a migration spectrometry body; It is characterized in that; The front end of said migration spectrometry body is provided with the injector that can realize that sample analysis by absorption of gases and test paper wiping are analyzed; Be provided with the first ion migration area and the second ion migration area that are respectively applied for positive ion and the detection of negative ion mobility in the said migration spectrometry body; The rear end of said injector is communicated with the front end of the said first ion migration area and the second ion migration area through a bilateral trunnion; Be provided with first ionization chamber between the rear end of the front end of the said first ion migration area and said bilateral trunnion; Be provided with second ionization chamber between the rear end of the front end of the said second ion migration area and said bilateral trunnion, the front end of the said first ion migration area and the second ion migration area is provided with electromotive force migration door, and the rear end of the said first ion migration area and the second ion migration area is provided with the ion collection dish; Said ion collection dish is communicated with the signal output part that is arranged on said migration spectrometry body rear end through the ion flow detecting device; The said first ionization chamber travel district and the second ionization chamber travel district respectively are provided with one group of electrode needle, and an end of said electrode needle is arranged in the said first ionization chamber travel district and the second ionization chamber travel district, and the other end of said electrode needle is communicated with the voltage of electric field of test positive ion or test negative ion respectively through contact conductor.

2. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1; It is characterized in that; The front end of said injector is provided with the flat injection port of a single narrow slit, said injector be provided with one with the valve that is connected of end of bleeding of sampling pump.

3. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 2; It is characterized in that; In said injector, also be provided with a feedback tracheae; The rear end of said feedback tracheae is connected with the exhaust end of said sampling pump, and the front end of said feedback tracheae is provided with and brushes mouth, and the said mouth that brushes is arranged on said injection port below.

4. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1; It is characterized in that; Said injector adopts metal or high thermal conduc tivity ceramics to make, and the outer setting of said injector is wound with the constantan heating plate and wraps up in applies high-temperature-resistant thermal-insulation material heating heat-insulation layer.

5. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1 is characterized in that, are provided with the filtering membrane that is used to deaden dust steam between said injector rear end and the said bilateral trunnion; The injector air motion can be oppressed filtering membrane to carry sample air and to get into the first ion migration area and the second ion migration area through filtering membrane from the bilateral trunnion, and the bilateral trunnion makes the sample air even entering first ion migration area and the second ion migration area carry out ion mobility and detects.

6. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1 is characterized in that said injector is fixed on the front end of said migration spectrometry body through a set collar.

7. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1 is characterized in that, are covered with one group of heat tracing cover in the external packets of said migration spectrometry body.

8. the two pipes of surveying of single tube double-chamber suction test paper dual-sampling cation and anion mobility spectrum as claimed in claim 1 is characterized in that said contact conductor is communicated with the voltage of electric field of test positive ion and test negative ion through the electric field high-voltage plug.

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