An X-ray security inspection system based on physical encryption of random suspended particles

Abstract

The invention discloses an X-ray security inspection system based on physical encryption of random suspended particles, comprising an X-ray radiation source, a mask component, an item to be tested and a detector. The X-ray radiation source emits X-rays, the mask component shields the rays to attenuate them, hides part of the information of the item to be tested carried by the X-rays, and the detector detects the ray signal. The invention provides a mask component, suspends hollow alloy particles composed of erbium oxide and tungsten oxide in a waterborne polyurethane substrate, and stirs them with a stirring rod. After the intensity of the original X-rays is modulated, the X-ray intensity of the transmitted item is made random and non-uniform, and the non-visualization of privacy information at the detection end can be achieved, thereby avoiding the leakage of privacy information. The invention can replace the conventional security inspection system in some special security inspection scenarios, and complete the security inspection without infringing the privacy of the participants.

Description

Technical Field

[0001] The invention relates to the technical field of encrypted radiation imaging, and in particular to an X-ray security inspection system based on physical encryption of random suspended particles. Background Art

[0002] Safety inspection is an inspection of the implementation of safety production laws and regulations, safety production status, labor conditions, potential accidents, etc. in construction projects. Its main contents include checking thoughts, systems, machinery and equipment, safety and health facilities, safety education and training, production personnel behavior, construction of protective equipment, handling of casualties, etc. With the development and progress of information technology, safety inspection technology is becoming more and more efficient and accurate, and it can also achieve a full range of "perspective" for closed projects.

[0003] However, the current "transparency" of security checks, while accurately identifying contraband, also exposes privacy and sensitive information. People are sometimes quite concerned about security checks, and it is difficult to protect privacy information while identifying contraband. Summary of the invention

[0004] The present invention provides an X-ray security inspection system based on physical encryption of random suspended particles, which can effectively solve the problem raised in the above background technology that the "perspective" of current security inspections, while accurately identifying contraband, also exposes the privacy and sensitive information therein. People are sometimes quite concerned about security inspections and it is difficult to protect privacy information while identifying contraband.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an X-ray security inspection system based on physical encryption of random suspended particles, comprising an X-ray radiation source, a mask assembly, an item to be tested and a detector;

[0006] The X-ray radiation source emits X-rays, the mask assembly shields the rays to attenuate them, hides part of the information of the item to be tested carried by the X-rays, and the detector detects the ray signal;

[0007] The X-ray radiation source emits X-rays. Under the action of the mask assembly, the detector obtains the information of the ray signal sequence, and judges the correlation between the contraband X-ray energy deposition sequence F and the sample X-ray energy deposition sequence G according to the similarity between the contraband and the sample sequence. Assume that the two sequences are F{f 1 ,f 2 ,……,f n},G{g 1 ,g 2 ,……,g n}, then the similarity ρ of the two sequences is defined as follows:

[0008]

[0009] When fg The smaller it is, the stronger the correlation between the two sequences is. fg The larger it is, the worse the correlation between the two sequences is.

[0010] Define a threshold T, when ρ fg When the value of is higher than the threshold T, it is considered that the object to be tested does not contain contraband;

[0011] When fg When the value is lower than the threshold T, it is considered that the items to be tested contain prohibited items, and a more detailed inspection of the items to be tested is required. The threshold T is adjusted according to the location and prohibited items.

[0012] According to the above technical solution, the mask assembly includes hollow alloy particles, waterborne polyurethane and a stirring rod;

[0013] The waterborne polyurethane is the base of the mask assembly, and the waterborne polyurethane is contained in a sealed container. The composition of the alloy hollow particles includes erbium oxide (Er 2 O 3 ) and tungsten oxide (WO 3 ), the alloy hollow particles and the stirring rod are dispersed in a closed container containing waterborne polyurethane.

[0014] According to the above technical solution, the preparation steps of the hollow alloy particles are as follows:

[0015] S1, first Er 2 O 3 and WO 3 Mix according to the proportion;

[0016] S2, preparing the above mixture into irregular alloy particles;

[0017] S3, hollowing out the alloy particles;

[0018] S4. Encapsulate the irregular hollow alloy particles into a sealed container containing water-based polyurethane.

[0019] According to the above technical solution, in S1, Er in the hollow alloy particles 2 O 3 and WO 3 The volume ratio is 1:1, and the density of the alloy is 7.96g / cm 3 ;

[0020] In S3, the overall density of the hollowed alloy particles is the same as the density of the selected waterborne polyurethane material, and the hollow alloy particles are suspended in the waterborne polyurethane;

[0021] The hollow alloy particles in the mixture in S4 account for 20% of the total volume, and the alloy particles are freely suspended and flow randomly in the liquid substrate at room temperature.

[0022] According to the above technical solution, in the mask assembly, the stirring rod moves along a fixed track to disturb the position distribution of the hollow alloy particles in the substrate to obtain a random ray attenuation shielding body.

[0023] According to the above technical solution, the process of the mask assembly in actual security inspection is as follows:

[0024] A1. Count the prohibited items that are restricted from entering the venue;

[0025] A2. Collect samples of all prohibited items as reference samples for subsequent security inspections;

[0026] A3. Obtaining sequence information of samples to be tested;

[0027] A4. Use algorithms to determine the relationship between sequence information and determine whether contraband is contained.

[0028] According to the above technical solution, in A3, when the sequence information of the sample to be tested is obtained,

[0029] The stirring rod is stirred at a random angle, and after the suspended particles are still, all the contraband samples and the samples to be tested are irradiated once. Each stirring is followed by one round of irradiation, for a total of n rounds;

[0030] Then, the total energy deposition of n X-rays is collected for each sample, and the X-ray energy deposition sequence information F of the contraband sample and the X-ray energy deposition sequence information G of the sample to be tested are obtained.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] By setting up a mask assembly, hollow alloy particles composed of erbium oxide and tungsten oxide are suspended in a water-based polyurethane base and stirred with a stirring rod. After the intensity of the original X-rays is modulated, the X-ray intensity of the transmission item is made random and non-uniform, which can achieve the non-visualization of privacy information at the detection end and avoid the leakage of privacy information. It can replace conventional security inspection systems in some special security inspection scenarios and complete security inspections without infringing on the privacy of participants. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1It is a working principle diagram of the suspended hollow alloy particles of the present invention;

[0035] Figure 2 It is a schematic diagram of the device of the security inspection system of the present invention;

[0036] Figure 3 It is an inspection flow chart of the security inspection system of the present invention;

[0037] Figure 4 It is a sequence image of X-ray energy deposition of the sample to be tested and some contraband in the embodiment of the present invention. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Example: Figure 1-2 As shown, the present invention provides a technical solution, an X-ray security inspection system based on physical encryption of random suspended particles, including an X-ray radiation source, a mask assembly, an item to be tested and a detector;

[0040] The X-ray radiation source emits X-rays, the mask assembly shields the rays to attenuate them, hides part of the information of the item to be tested carried by the X-rays, and the detector detects the ray signal;

[0041] The X-ray radiation source emits X-rays. Under the action of the mask assembly, the detector obtains the information of the ray signal sequence and judges the correlation between the contraband X-ray energy deposition sequence F and the sample X-ray energy deposition sequence G according to the similarity between the contraband and the sample sequence. Assume that the two sequences are F{f 1 ,f 2 ,……,f n},G{g 1 ,g 2 ,……,g n}, then the similarity ρ of the two sequences is defined as follows:

[0042]

[0043] When fg The smaller it is, the stronger the correlation between the two sequences is. fg The larger it is, the worse the correlation between the two sequences is.

[0044] Define a threshold T, when ρ fg When the value of is higher than the threshold T, it is considered that the object to be tested does not contain contraband;

[0045] When fgWhen the value is lower than the threshold T, it is considered that the items to be tested contain prohibited items, and a more detailed inspection of the items to be tested is required. The threshold T is adjusted according to the location and prohibited items.

[0046] According to the above technical solution, the mask assembly includes hollow alloy particles, waterborne polyurethane and a stirring rod;

[0047] The water-based polyurethane is the base of the mask assembly. The water-based polyurethane is contained in a sealed container. The composition of the alloy hollow particles includes erbium oxide (Er 2 O 3 ) and tungsten oxide (WO 3 ), the alloy hollow particles and the stirring rod are dispersed in a closed container containing waterborne polyurethane.

[0048] According to the above technical solution, the preparation steps of the alloy hollow particles are as follows:

[0049] S1, first Er 2 O 3 and WO 3 Mix according to the proportion;

[0050] S2, preparing the above mixture into irregular alloy particles;

[0051] S3, hollowing out the alloy particles;

[0052] S4. Encapsulate the irregular hollow alloy particles into a sealed container containing water-based polyurethane.

[0053] According to the above technical solution, in S1, Er in the hollow alloy particles 2 O 3 and WO 3 The volume ratio is 1:1, and the density of the alloy is 7.96g / cm 3 ;

[0054] In S3, the overall density of the hollowed alloy particles is the same as the density of the selected waterborne polyurethane material, and the hollow alloy particles are suspended in the waterborne polyurethane;

[0055] In the mixture of S4, the alloy hollow particles account for 20% of the total volume, and the alloy particles are freely suspended and flow randomly in the liquid matrix at room temperature.

[0056] According to the above technical solution, in the mask assembly, the stirring rod moves along a fixed track to disrupt the position distribution of the hollow alloy particles in the substrate to obtain a random ray attenuation shielding body. Through such a random attenuation shielding body, the ray signal detected by the detector can be disrupted, thereby reducing the sensitive information carried by the ray.

[0057] According to the above technical solution, if Figure 3As shown, the process of mask assembly in actual security inspection is as follows:

[0058] A1. Count the prohibited items that are restricted from entering the venue;

[0059] A2. Collect samples of all prohibited items as reference samples for subsequent security inspections;

[0060] A3. Obtaining sequence information of samples to be tested;

[0061] A4. Use algorithms to determine the relationship between sequence information and determine whether contraband is contained.

[0062] According to the above technical solution, in A3, when the sequence information of the sample to be tested is obtained,

[0063] The stirring rod is stirred at a random angle, and after the suspended particles are still, all the contraband samples and the samples to be tested are irradiated once. Each stirring is followed by one round of irradiation, for a total of n rounds;

[0064] Then, the total energy deposition of n X-rays is collected for each sample, and the X-ray energy deposition sequence information F of the contraband sample and the X-ray energy deposition sequence information G of the sample to be tested are obtained.

[0065] like Figure 4 As shown, sequence one to sequence four represent the X-ray energy deposition sequences of four example contraband items, and the reference sequence is the X-ray energy deposition sequence of the sample to be tested;

[0066] It is obvious that the degree of similarity between the sequence 1 contraband and the tested item is higher than that between other contraband and the tested sample, so the tested sample is more likely to contain the sequence 1 contraband.

[0067] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An X-ray security inspection system based on random suspended particle physical encryption, characterized by: Includes X-ray radiation source, mask assembly, items to be tested and detectors; The X-ray radiation source emits X-rays, the mask assembly shields the rays to attenuate them, hides part of the information of the item to be tested carried by the X-rays, and the detector detects the ray signal; The X-ray radiation source emits X-rays. Under the action of the mask assembly, the detector obtains the information of the ray signal sequence, and judges the correlation between the contraband X-ray energy deposition sequence F and the sample X-ray energy deposition sequence G according to the similarity between the contraband and the sample sequence. Assume that the two sequences are F{f1, f2, ..., f n }, G{g1, g2, ..., g n }, then the similarity ρ of the two sequences is defined as follows: When fg The smaller it is, the stronger the correlation between the two sequences is. fg The larger it is, the worse the correlation between the two sequences is. Define a threshold T, when ρ fg When the value of is higher than the threshold T, it is considered that the object to be tested does not contain contraband; When fg When the value is lower than the threshold value T, it is considered that the items to be tested contain contraband, and a more detailed inspection of the items to be tested is required. The threshold value T is adjusted according to the location and contraband; The mask assembly includes alloy hollow particles, waterborne polyurethane and a stirring rod; The waterborne polyurethane is the base of the mask assembly, the waterborne polyurethane is contained in a sealed container, the components of the hollow alloy particles include erbium oxide (Er2O3) and tungsten oxide (WO3), and the hollow alloy particles and a stirring rod are dispersed in the sealed container containing the waterborne polyurethane; The process of the mask assembly in actual security inspection is as follows: A1. Count the prohibited items that are restricted from entering the venue; A2. Collect samples of all prohibited items as reference samples for subsequent security inspections; A3. Obtaining sequence information of samples to be tested; A4. Use algorithms to determine the relationship between sequence information and determine whether contraband is contained; In A3, when the sequence information of the sample to be tested is obtained, The stirring rod is stirred at a random angle, and after the suspended particles are still, all the contraband samples and the samples to be tested are irradiated once. Each stirring is followed by one round of irradiation, for a total of n rounds; Then, the total energy deposition of n X-rays is collected for each sample, and the X-ray energy deposition sequence information F of the contraband sample and the X-ray energy deposition sequence information G of the sample to be tested are obtained.

2. According to claim 1, an X-ray security inspection system based on random suspended particle physical encryption is characterized in that: The preparation steps of the alloy hollow particles are as follows: S1. First, mix Er2O3 and WO3 in proportion; S2, preparing the above mixture into irregular alloy particles; S3, hollowing out the alloy particles; S4. Encapsulate the irregular hollow alloy particles into a sealed container containing water-based polyurethane.

3. The X-ray security inspection system based on random suspended particle physical encryption according to claim 2 is characterized in that: In the S1, the volume ratio of Er2O3 and W03 in the hollow alloy particles is 1:1, and the density of the prepared alloy is 7.96 g / cm 3 ; In S3, the overall density of the hollowed alloy particles is the same as the density of the selected waterborne polyurethane material, and the hollow alloy particles are suspended in the waterborne polyurethane; The hollow alloy particles in the mixture in S4 account for 20% of the total volume, and the alloy particles are freely suspended and flow randomly in the liquid substrate at room temperature.

4. The X-ray security inspection system based on random suspended particle physical encryption according to claim 1 is characterized in that: In the mask assembly, the stirring rod moves along a fixed track to disturb the position distribution of the hollow alloy particles in the substrate, thereby obtaining a random ray attenuation shielding body.

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