A detector used in a vehicle security inspection system

Abstract

The present invention discloses a detector used in a vehicle security inspection system, comprising a housing, a multiplier circuit, a signal processing circuit board and an image display; the multiplier circuit is arranged in the housing, comprising a black heat shrink tube, in which a scintillator, a light-guiding silicone oil layer and a photomultiplier tube are arranged in sequence; the signal processing circuit board is connected to the photomultiplier tube in the multiplier circuit; the image display is connected to the signal processing circuit board; when X-rays are irradiated to the scintillator, the scintillator generates photons; the photons enter the cathode of the photomultiplier tube after passing through the light-guiding silicone oil layer and generate photoelectrons; the photoelectrons are accelerated and multiplied in the multiplier tube, and an electric pulse signal is formed on the anode of the photomultiplier tube, and the electric pulse signal is output to the image display after passing through the signal processing circuit board to generate a detection image. The present invention can greatly improve the effect of surface coupling between the multiplier tube and the scintillator.

Description

Technical Field

[0001] The invention belongs to the technical field of logistics and vehicle safety detection, and in particular relates to a detector used in a vehicle safety inspection system. Background Art

[0002] In recent years, public security checkpoints and automobile logistics parks have installed radiographic imaging systems to check whether vehicles carry prohibited items such as guns, explosives, flammable and explosive liquids, and controlled knives. The vehicle safety radiographic imaging detection system is a security inspection system with strong penetration to identify explosives and dangerous goods in vehicles. It uses radiographic detector imaging technology and generates images related to the outline and shape of the items loaded on the vehicle after receiving signals through image processing, so as to distinguish whether there are suspicious dangerous goods and achieve the purpose of safety inspection. It is suitable for the inspection of medium and large containers and is widely used in seaports, Haikou, public security and other inspection fields.

[0003] In order to obtain a clear scanned image, a photomultiplier tube with higher sensitivity is needed to receive the weak signal transmitted through the vehicle. The design and manufacture of the photomultiplier tube assembly has a significant impact on the image effect, and if the design is poor, it will also cause damage to the multiplier tube. Summary of the invention

[0004] In view of the above problems, the present invention provides a detector for use in a vehicle security inspection system, which can greatly improve the effect of surface coupling between a multiplier tube and a scintillator.

[0005] To achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A detector used in a vehicle security inspection system, comprising:

[0007] case;

[0008] The multiplication pipeline is arranged in the housing, and includes a black heat shrink tube, in which a scintillator, a light-guiding silicone oil layer and a photomultiplier tube are arranged in sequence:

[0009] A signal processing circuit board, one end of which is connected to the photomultiplier tube in the multiplication circuit;

[0010] An image display connected to the other end of the signal processing circuit board;

[0011] When X-rays irradiate the scintillator, the scintillator generates photons; the photons enter the cathode of the photomultiplier tube after passing through the light-guiding silicone oil layer and generate photoelectrons; the photoelectrons are accelerated and multiplied in the multiplier tube, forming an electrical pulse signal on the anode of the photomultiplier tube, and the electrical pulse signal is output to the image display after passing through the signal processing circuit board to generate a detection image.

[0012] Optionally, a photomultiplier tube seat is further provided in the shell, the photomultiplier tube is mounted on the photomultiplier tube seat, and the photomultiplier tube seat is connected to the shell via a tube seat connecting seat.

[0013] Optionally, a circuit fixing seat is further provided in the shell, the signal processing circuit board is arranged on the circuit fixing seat, and the circuit fixing seat is connected to the shell.

[0014] Optionally, the circuit fixing seat and the tube seat connecting seat are connected via an elastic adjustment frame.

[0015] Optionally, the elastic adjustment frame includes an adjustment screw and a spring sleeved on the adjustment screw.

[0016] Optionally, the image display and the signal processing circuit board are connected via an aviation plug.

[0017] Optionally, the aviation plug is located outside the shell, and an aviation plug connection socket connected to the aviation plug is provided at the end of the shell.

[0018] Optionally, the aviation plug connector is connected to the housing via a pressure ring.

[0019] Optionally, a cover is provided on one end of the shell close to the scintillator.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a detector used in a vehicle security inspection system, which not only greatly improves the surface coupling effect between a multiplier tube and a scintillator, but also reduces the damage to the multiplier tube caused by physical impact or vibration during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a detector assembly in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the assembly of a scintillator, light-guiding silicone oil, a photomultiplier tube, and a black heat shrink tube in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection between the multiplier tube base and the circuit fixing base in one embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the housing of the multiplier tube detector and the aviation plug in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the front end cover structure in one embodiment of the present invention;

[0027] Figure 6This is a schematic diagram of the structure of an aviation plug in an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of a compression ring structure according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of an aviation plug connector according to an embodiment of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure of a housing in one embodiment of the present invention;

[0031] in:

[0032] 1-scintillator, 2-black heat shrink tube, 3-light-guiding silicone oil layer, 4-photomultiplier tube, 5-photomultiplier tube seat connector, 6-adjusting screw, 7-spring, 8-circuit fixing seat, 9-cover, 10-shell, 11-aviation plug connector, 12-pressure ring, 13-aviation plug, 14-photomultiplier tube seat, 15-signal processing circuit board, 16-elastic adjustment frame. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The application principle of the present invention is described in detail below in conjunction with the accompanying drawings.

[0035] Example 1

[0036] An embodiment of the present invention provides a detector for a vehicle security inspection system, comprising:

[0037] Housing 10;

[0038] The multiplier circuit is arranged in the housing 10, and includes a black heat shrink tube 2, in which a scintillator 1, a light-guiding silicone oil layer 3 and a photomultiplier tube 4 are arranged in sequence: the light-guiding silicone oil layer 3 is used to reduce photon loss and improve the collection efficiency of the detector; the black heat shrink tube 2 can reduce the interference of external light, so that the multiplier tube and the scintillator 1 are in close contact, and the loss of light generated by the scintillator 1 caused by installation is reduced;

[0039] A signal processing circuit board 15, one end of which is connected to the photomultiplier tube 4 in the multiplication circuit; the structure of the signal processing board 15 is the prior art, as long as it can process the received signal and send it to the image display;

[0040] An image display (not shown) is connected to the other end of the signal processing circuit board 15 .

[0041] In summary, the working principle of the detector assembly in the embodiment of the present invention is specifically as follows:

[0042] When X-rays are irradiated to the scintillator 1, the scintillator 1 generates photons; the photons enter the cathode of the photomultiplier tube 4 after passing through the light-guiding silicone oil layer 3 and generate photoelectrons; the photoelectrons are accelerated and multiplied in the photomultiplier tube, forming an electric pulse signal on the anode of the photomultiplier tube 4, and the electric pulse signal is output to the image display after passing through the signal processing circuit board 15 to generate a detection image.

[0043] In a specific implementation of the embodiment of the present invention, a photomultiplier tube seat 14 is further provided in the housing 10, the photomultiplier tube 4 is mounted on the photomultiplier tube seat 14, and the photomultiplier tube seat 14 is connected to the housing 10 via a tube seat connection seat 5. A circuit fixing seat 8 is further provided in the housing 10, the signal processing circuit board 15 is arranged on the circuit fixing seat 8, and the circuit fixing seat 8 is connected to the housing 10.

[0044] In a specific implementation of an embodiment of the present invention, in order to increase the dustproof and waterproof effects and increase the signal output stability, the image display and the signal processing circuit board 15 are connected through an aviation plug 13; the aviation plug 13 is located outside the shell 10, and the end of the shell 10 is provided with an aviation plug connector 11 connected to the aviation plug 13; the aviation plug connector 11 is connected to the shell 10 through a pressure ring 12.

[0045] In a specific implementation of the embodiment of the present invention, a cover 9 is provided on one end of the housing 10 close to the scintillator.

[0046] Example 2

[0047] Based on Example 1, in order to increase the detector assembly's resistance to physical shock or vibration and prevent the detector from being damaged, the difference between this embodiment of the present invention and Example 1 is that:

[0048] The circuit fixing seat 8 is connected to the tube socket connecting seat via an elastic adjustment frame 16 .

[0049] In a specific implementation of the embodiment of the present invention, the elastic adjustment frame includes an adjustment screw 6 and a spring 7 sleeved on the adjustment screw 6 .

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A detector used in a vehicle security inspection system, characterized in that: include: case; The multiplication pipeline is arranged in the housing, and includes a black heat shrink tube, in which a scintillator, a light-guiding silicone oil layer and a photomultiplier tube are arranged in sequence: A signal processing circuit board, one end of which is connected to the photomultiplier tube in the multiplication circuit; An image display connected to the other end of the signal processing circuit board; When X-rays are irradiated to the scintillator, the scintillator generates photons; the photons enter the cathode of the photomultiplier tube after passing through the light-guiding silicone oil layer and generate photoelectrons; the photoelectrons are accelerated and multiplied in the multiplier tube, and an electrical pulse signal is formed on the anode of the photomultiplier tube; the electrical pulse signal passes through the signal processing circuit board and is output to the image display to generate a detection image; A photomultiplier tube seat is also provided in the shell, the photomultiplier tube is mounted on the photomultiplier tube seat, and the photomultiplier tube seat is connected to the shell via a tube seat connector; A circuit fixing seat is also provided in the housing, the signal processing circuit board is arranged on the circuit fixing seat, and the circuit fixing seat is connected to the housing; The circuit fixing seat and the tube socket connecting seat are connected via an elastic adjustment frame; The image display and the signal processing circuit board are connected via an aviation plug; The aviation plug is located outside the shell, and an aviation plug connection socket connected to the aviation plug is provided at the end of the shell; The aviation plug connector is connected to the housing via a pressure ring.

2. The detector used in a vehicle security inspection system according to claim 1, characterized in that: The elastic adjustment frame comprises an adjustment screw and a spring sleeved on the adjustment screw.

3. The detector used in a vehicle security inspection system according to claim 1, characterized in that: A cover is provided on one end of the shell body close to the scintillator.

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