摘要:
Disclosed is an electrode structure for a drift tube in IMS comprising a ring electrode, for each of two surfaces of the ring electrode, at least a part adjacent to the inner radius is formed into a cone, and the angles formed between the cones and the axis of the ring electrode are different from each other. The electrode structure of the present invention can alleviate, even eliminate, the accumulation of space charges in the drift tube. Such structure is particularly suitable when the electric field in the drift tube is low in strength or a great number of ions pass through. Meanwhile, the structure allows a significant decrease in the size of the outer radius of the electrode, while the inner radius remains constant. In this way, it is possible to effectively reduce the outline size of the drift tube and thus make the IMS compact.
摘要:
Disclosed is an ion gate for a dual IMS and method. The ion gate includes an ion source, a first gate electrode placed on one side of the ion source, a second gate electrode placed on the other side of the ion source, a third gate electrode placed on the side of the first gate electrode away from the ion source, a fourth gate electrode placed on the side of the second gate electrode away from the ion source, wherein during the ion storage, the potential at the position on the tube axis of the ion gate corresponding to the first gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the third gate electrode, and the potential at the position on the tube axis corresponding to the second gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the fourth gate electrode. According to the present invention, after sample gas enters the ion gates, charge exchange with reaction ions occurs between the first gate electrode and the second electrode, and positive and negative ions are continuously stored into the storage regions for the positive and negative ions. This leads to an improvement of utility rate of ions. Then, the ions are educed in a step-wise manner from the storage regions for the positive and negative ions by a simple control of a combination of the electrodes.
摘要:
Disclosed is an ion source comprising a plate-shaped source body which has radioactivity on its both sides and allows positive and negative ions to penetrate through the source body. The present invention gives beneficial effects. First, the ion source structure can improve the ionization efficiency of sample molecules, and the generated sample ions have a centralized distribution within a flat space on both sides of the source body. Such distribution of ion cloud facilitates to improve the IMS sensitivity. Meanwhile, the source body of the present invention has a transmittance in itself. Thus, positive and negative ions generated on both sides of the source body can penetrate through the source body and be separated to the both sides of the source body. In this way, it is possible to improve the utilization efficiency of ions.
摘要:
The present invention discloses a security inspection door comprising a narcotic drug/explosive detecting subsystem, a radioactive substance detecting subsystem and a metal detecting subsystem which are provided in a tank body, wherein electromagnetic radiation shields are respectively provided around the three detecting subsystems, so that the narcotic drug/explosive detecting subsystem, the radioactive substance detecting subsystem and the metal detecting subsystem are isolated from one another and are not interfered with one another. In the present invention, the narcotic drug/explosive detecting subsystem, the radioactive substance detecting subsystem and the metal detecting subsystem are combined together for the first time to form a novel security inspection door, so the narcotic drugs/the explosives, the radioactive substances and the dangerous metal articles can be detected at the same time. Further, in the present invention, electromagnetic radiation shields are respectively provided around the three detecting subsystems, so that the three detecting subsystems are isolated from one another and are not interfered with one another, and thus, the inspection reliability and the inspection accuracy are improved.
摘要:
Disclosed is an ion mobility spectrometer. The ion mobility spectrometer comprises a sample injector (14), a semipermeable membrane (15), an ionization region (16), a terminal electrode (18), an ion storage region, a drift region and a Faraday plate (22), which are arranged along a drift tube in turn, wherein one or more air inlets (29) connected with a needle valve (30) and a first filtering device (31) are arranged in one side near the semipermeable membrane (15) of the ionization region (16), there is at least one opening in the terminal electrode (18), whose diameter is smaller than the diameter of the air inlets (29), an air outlet (28) connected with an air extracting pump (27) is arranged near the terminal electrode (18) in the ionization region (16), the drift region is separated from the ionization region (16) by a micropore structure of the ion storage region, another air outlet (25) connected with another air extracting pump (26) is arranged at one side near the Faraday plate (22) of the terminal electrode (18).
摘要:
A security inspection door comprising a narcotic drug/explosive detecting subsystem, a radioactive substance detecting subsystem and a metal detecting subsystem which are provided in a tank body is disclosed, wherein electromagnetic radiation shields are respectively provided around the three detecting subsystems, so that they are isolated from one another and are not interfered with one another. The three detecting subsystems are combined together to form a novel security inspection door, so the narcotic drugs/the explosives, the radioactive substances and the dangerous metal articles can be detected at the same time. Further, electromagnetic radiation shields are respectively provided around the three detecting subsystems, so that the three detecting subsystems are isolated from one another and are not interfered with one another, and thus, the inspection reliability and the inspection accuracy are improved.
摘要:
Disclosed is an ion mobility spectrometer. The ion mobility spectrometer comprises a sample injector (14), a semipermeable membrane (15), an ionization region (16), a terminal electrode (18), an ion storage region, a drift region and a Faraday plate (22), which are arranged along a drift tube in turn, wherein one or more air inlets (29) connected with a needle valve (30) and a first filtering device (31) are arranged in one side near the semipermeable membrane (15) of the ionization region (16), there is at least one opening in the terminal electrode (18), whose diameter is smaller than the diameter of the air inlets (29), an air outlet (28) connected with an air extracting pump (27) is arranged near the terminal electrode (18) in the ionization region (16), the drift region is separated from the ionization region (16) by a micropore structure of the ion storage region, another air outlet (25) connected with another air extracting pump (26) is arranged at one side near the Faraday plate (22) of the terminal electrode (18).
摘要:
Disclosed is an ion gate for a dual IMS and method. The ion gate includes an ion source, a first gate electrode placed on one side of the ion source, a second gate electrode placed on the other side of the ion source, a third gate electrode placed on the side of the first gate electrode away from the ion source, a fourth gate electrode placed on the side of the second gate electrode away from the ion source, wherein during the ion storage, the potential at the position on the tube axis of the ion gate corresponding to the first gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the third gate electrode, and the potential at the position on the tube axis corresponding to the second gate electrode is different from the potentials at the positions on the tube axis corresponding to the ion source and the fourth gate electrode. According to the present invention, after sample gas enters the ion gates, charge exchange with reaction ions occurs between the first gate electrode and the second electrode, and positive and negative ions are continuously stored into the storage regions for the positive and negative ions. This leads to an improvement of utility rate of ions. Then, the ions are educed in a step-wise manner from the storage regions for the positive and negative ions by a simple control of a combination of the electrodes.
摘要:
The present invention discloses a door-type passenger security inspection apparatus comprising: an air source supplying an air flow; a spraying device for spraying the air flow onto the body and clothes of a passenger being inspected; an air-spray moving device for moving the spraying device; a collecting device for collecting suspicious particles of contraband articles separated from the body and the clothes of the passenger; and a detecting device for detecting the suspicious particles of contraband articles collected by the collecting device. Further, the present invention also provides a method for passenger security inspection on prohibited-articles. With the technical solution of the present inventions contraband articles such as narcotic drugs and explosives may be detected reliably and effectively. Thus, aiming at the requirements of anti terror, the present invention is able to ensure the security of persons and facilities at important occasions, such as airports, stations, national defenses public security, fire protection, anti-terror, customs, environmental protection, scientific research.
摘要:
Disclosed is an electrode structure for a drift tube in IMS comprising a ring electrode, for each of two surfaces of the ring electrode, at least a part adjacent to the inner radius is formed into a cone, and the angles formed between the cones and the axis of the ring electrode are different from each other. The electrode structure of the present invention can alleviate, even eliminate, the accumulation of space charges in the drift tube. Such structure is particularly suitable when the electric field in the drift tube is low in strength or a great number of ions pass through. Meanwhile, the structure allows a significant decrease in the size of the outer radius of the electrode, while the inner radius remains constant. In this way, it is possible to effectively reduce the outline size of the drift tube and thus make the IMS compact.