CN112965121A - Radiation imaging security inspection system based on liquid metal random coding - Google Patents
Radiation imaging security inspection system based on liquid metal random coding Download PDFInfo
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- CN112965121A CN112965121A CN202110150794.XA CN202110150794A CN112965121A CN 112965121 A CN112965121 A CN 112965121A CN 202110150794 A CN202110150794 A CN 202110150794A CN 112965121 A CN112965121 A CN 112965121A
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- liquid metal
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 50
- 238000007689 inspection Methods 0.000 title claims abstract description 33
- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 230000005855 radiation Effects 0.000 title claims abstract description 12
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 9
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001128 Sn alloy Inorganic materials 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 230000008021 deposition Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000010835 comparative analysis Methods 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 18
- 239000000956 alloy Substances 0.000 abstract description 18
- 239000007788 liquid Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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- G01V5/22—
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
- G21K1/065—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators using refraction, e.g. Tomie lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
Abstract
The invention discloses a radiation imaging security inspection system based on liquid metal random coding, which comprises a liquid metal shielding screen, wherein the liquid metal shielding screen is made of gallium indium tin alloy, and the liquid metal shielding screen rotates around the body center of the liquid metal shielding screen in a disordered way at a certain inclination angle when working, so that the liquid metal in the liquid metal shielding screen flows in a disordered way, the purpose of modulating X rays is achieved, the information carried in the liquid metal shielding screen is distorted, and the fingerprint information K of prohibited articles in the encryption technologyrefThe liquid metal shielding screen provided by the invention has the advantages of scientific and reasonable structure and safe and convenient use, provides the privacy protection capability, and the main material of the liquid metal shielding screen is composed of gallium indium tin alloy, so that the information carried by emergent X rays can be effectively distorted, namely the information carried by the emergent X rays can be effectively distorted at normal temperatureThe alloy is in liquid state, the alloy with the proportion is packaged in a closed container, and the container is filled with the alloy until the volume of the container reaches about two thirds of the volume of the container, so that the liquid alloy in the container flows disorderly, and the screen has different transmittances for the transmitted X-ray to achieve the effect of modulating an original signal.
Description
Technical Field
The invention relates to the technical field of information and safety, in particular to a radiation imaging security inspection system based on liquid metal random coding.
Background
With the continuous development and progress of society, people go out more frequently, and safety inspection becomes an indispensable link, and most of safety inspection equipment in the market at present is based on the X-ray imaging principle, and because of the high perspective of X-ray intensity, people have long disputed whether privacy is leaked too much in the safety inspection process.
Disclosure of Invention
The invention provides a radiation imaging security inspection system based on liquid metal random coding, which can effectively solve the problem that most security inspection equipment in the market at present is based on an X-ray imaging principle, and people have long disputed whether privacy is leaked too much or not in the security inspection process due to the high perspective of X-ray intensity.
In order to achieve the purpose, the invention provides the following technical scheme: a radiation imaging security inspection system based on liquid metal random coding comprises a liquid metal shielding screen, wherein the liquid metal shielding screen is made of gallium indium tin alloy;
when the liquid metal shielding screen works, the liquid metal shielding screen rotates around the body center of the liquid metal shielding screen in disorder at a certain inclination angle, so that the liquid metal in the liquid metal shielding screen flows in disorder, the purpose of modulating X rays is achieved, the carried information is distorted, and the fingerprint information K of contraband in the encryption technologyrefFingerprint information K of the object to be inspectediThe specific steps of generating and matching and comparing the two fingerprints are as follows:
a. contraband fingerprint information KrefGenerating;
b. fingerprint information K of object to be detectediGenerating;
c. and (5) carrying out comparative analysis.
According to the technical scheme, a measurement angle is selected for contraband in the step a, the system is used for irradiation, modules in the liquid metal shielding screen start to rotate when irradiation starts, the rotation motions of the modules are different and do not interfere with each other, 100 times of X-ray total energy deposition information is taken within a certain time range, and the obtained 100 pieces of X-ray total energy deposition data information form a fingerprint K of the samplerefTaking n angles to obtain n fingerprints K related to the samplerefEntering the database as the contrabandAnd the reference value is used for comparing the measured values of the to-be-detected articles.
According to the technical scheme, after all the information is recorded into the database in the step b, the security inspection system is prepared, and the security inspection system can be used for security inspection of the specific place, and contraband fingerprint K is generated in the same first steprefThe same, the object to be detected is put into the system for detection, and a fingerprint K can be obtained at an irradiation angleiN angles can obtain n fingerprints Ki。
According to the technical scheme, after the fingerprints of the to-be-detected object are obtained in the step C, the n fingerprints of the to-be-detected object are sequentially compared with all fingerprints in the database for analysis so as to determine whether the to-be-detected object is similar to the contraband, and a metric value C is adopted to quantitatively analyze the similarity between the to-be-detected sample and the fingerprint K of the contraband;
it is defined as follows:
wherein, KiA fingerprint of the article to be detected, the fingerprint consisting of 100 measured values of total energy deposition;
Kreffingerprint information of contraband;
μ(Kref) And σ (K)ref) Respectively, the mean and standard deviation of a certain angle fingerprint of the contraband.
According to the technical scheme, the closer the C value is to 0, the higher the similarity of the two samples is, namely the object to be detected is probably prohibited, and a similarity threshold V is definedthFor a fingerprint of a sample to be detected, the similarity between the fingerprint and fingerprint information in the database is lower than the threshold VthDetermining that the article to be detected does not contain contraband, and if the similarity is higher than VthThe sample to be detected may contain contraband and needs to be further checked, and the similarity threshold value can be automatically adjusted according to the security inspection importance degree of a place.
Compared with the prior art, the invention has the beneficial effects that: the liquid metal shielding screen provided by the invention has the advantages that the structure is scientific and reasonable, the use is safe and convenient, the privacy protection capability is provided, the main material of the liquid metal shielding screen is composed of gallium indium tin alloy, and the information carried by the emergent X rays can be effectively distorted. When the gallium indium tin in the alloy comprises the following components in percentage by weight: 68.5 percent, 21.5 percent and 10 percent, the melting point of the alloy is 8-19 ℃, namely the alloy is liquid at normal temperature, the alloy with the proportion is packaged in a closed container, the container can contain the alloy to about two thirds of the volume of the container, the environment temperature is controlled to about 25 ℃, the liquid property of the alloy is kept, the container rotates around the body center at random angular speed (has a certain inclination angle), so that the liquid alloy in the container flows disorderly, and the screen has different transmissivity on the transmitted X-ray to achieve the effect of modulating the original signal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a rotary screen modulated X-ray of the present invention;
FIG. 2 is a schematic top view of the liquid metal shield of the present invention;
FIG. 3 is a schematic diagram of the configuration of the X-ray security inspection system for protecting privacy of the present invention;
FIG. 4 is a schematic diagram of an imaging effect configuration of a conventional system of the present invention;
FIG. 5 is a schematic diagram of the imaging effect structure of the present system of the present invention;
FIG. 6 is a diagram of a fingerprint K from different angles in accordance with the present invention;
fig. 7 is a schematic view of the flow structure of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): the invention provides a technical scheme, and discloses a radiation imaging security inspection system based on liquid metal random coding, which comprises a liquid metal shielding screen, wherein the liquid metal shielding screen is made of gallium indium tin alloy;
as shown in fig. 1, in the working mechanism of a single liquid shielding screen, in the system of our invention, a single metal screen with N rows and M columns is tightly laid and combined into a larger liquid metal shielding screen, wherein each module operates independently without influencing each other, and we apply the liquid metal shielding screen composed of multiple modules to the measurement to encrypt the related information of the measured object; ,
as shown in fig. 2, the screen is shown in top view;
as shown in fig. 3, ammunition, drugs and the like are taken out, all contraband information is recorded into a database, and the security inspection system can be put into use after the database is updated, and the specific process is as follows:
s1, defining articles which are forbidden to be carried in the important place;
s2, collecting the contraband products on the market, preparing to input information, and updating the database;
s3, sequentially irradiating contraband by using the system provided by the invention, performing multi-angle irradiation on each sample (various contraband), and acquiring total energy deposition information of X-rays for 100 times at each angle; for a sample, each illumination angle produces a fingerprint K of the sample concernedrefN angles will result in n fingerprints; note that the fingerprint K obtained hererefIs the relevant information after being encrypted by the security check system;
after the information of various contraband articles is recorded, the database is updated, and the system can be put into use;
fig. 4 and 5 are results obtained after the conventional security inspection system and the system of the present invention are subjected to detection and image reconstruction, respectively, and it can be seen that the system of the present invention cannot obtain the related information about the object to be inspected even if the data information in the detection system is derived, i.e. the security inspection technology of the present invention can effectively protect the related information about the object to be inspected, compared with the conventional security inspection system.
As shown in fig. 6-7, the liquid metal shielding screen rotates around the body center of the liquid metal shielding screen disorderly at a certain inclination angle when in work, so that the liquid metal in the liquid metal shielding screen flows disorderly,the purpose of modulating X-ray is achieved, the information carried in the X-ray is distorted, and the fingerprint information K of contraband in the encryption technologyrefFingerprint information K of the object to be inspectediThe specific steps of generating and matching and comparing the two fingerprints are as follows:
a. contraband fingerprint information KrefGenerating;
b. fingerprint information K of object to be detectediGenerating;
c. and (5) carrying out comparative analysis.
According to the technical scheme, in the step a, a measurement angle is selected for contraband, the system is used for irradiation, when the irradiation is started, all modules in the liquid metal shielding screen start to rotate, the rotation motions of all the modules are different and do not interfere with each other, 100 times of X-ray total energy deposition information is taken within a certain time range, and the obtained 100X-ray total energy deposition data information forms a fingerprint K of the samplerefTaking n angles to obtain n fingerprints K related to the samplerefAnd the data base is recorded as a reference value of the contraband and used for comparing the measured value of the article to be detected.
According to the technical scheme, after all the information is recorded into the database in the step b, the security inspection system is prepared, and the security inspection system can be used for security inspection of the specific place, and contraband fingerprint K is generated in the same step as the first steprefThe same, the object to be detected is put into the system for detection, and a fingerprint K can be obtained at an irradiation angleiN angles can obtain n fingerprints Ki。
According to the technical scheme, after the fingerprints of the to-be-detected object are obtained in step C, the n fingerprints of the to-be-detected object are sequentially compared with all fingerprints in the database for analysis so as to determine whether the to-be-detected object is similar to the contraband, and a metric value C is adopted to quantitatively analyze the similarity of the to-be-detected sample and the fingerprint K of the contraband;
it is defined as follows:
wherein, KiA fingerprint of the article to be detected, the fingerprint consisting of 100 measured values of total energy deposition;
Kreffingerprint information of contraband;
μ(Kref) And σ (K)ref) Respectively, the mean and standard deviation of a certain angle fingerprint of the contraband.
According to the technical scheme, the closer the C value is to 0, the higher the similarity of the two samples is, namely the object to be detected is probably prohibited, and a similarity threshold V is definedthFor a fingerprint of a sample to be detected, the similarity between the fingerprint and fingerprint information in the database is lower than the threshold VthDetermining that the article to be detected does not contain contraband, and if the similarity is higher than VthThe sample to be detected may contain contraband and needs to be further checked, and the similarity threshold value can be automatically adjusted according to the security inspection importance degree of a place.
Compared with the prior art, the invention has the beneficial effects that: the liquid metal shielding screen provided by the invention has the advantages that the structure is scientific and reasonable, the use is safe and convenient, the privacy protection capability is provided, the main material of the liquid metal shielding screen is composed of gallium indium tin alloy, and the information carried by the emergent X rays can be effectively distorted. When the gallium indium tin in the alloy comprises the following components in percentage by weight: 68.5 percent, 21.5 percent and 10 percent, the melting point of the alloy is 8-19 ℃, namely the alloy is liquid at normal temperature, the alloy with the proportion is packaged in a closed container, the container can contain the alloy to about two thirds of the volume of the container, the environment temperature is controlled to about 25 ℃, the liquid property of the alloy is kept, the container rotates around the body center at random angular speed (has a certain inclination angle), so that the liquid alloy in the container flows disorderly, and the screen has different transmissivity on the transmitted X-ray to achieve the effect of modulating the original signal.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A radiation imaging security inspection system based on liquid metal random coding is characterized in that: the liquid metal shielding screen is made of gallium indium tin alloy;
when the liquid metal shielding screen works, the liquid metal shielding screen rotates around the body center of the liquid metal shielding screen in disorder at a certain inclination angle, so that the liquid metal in the liquid metal shielding screen flows in disorder, the purpose of modulating X rays is achieved, the carried information is distorted, and the fingerprint information K of contraband in the encryption technologyrefFingerprint information K of the object to be inspectediThe specific steps of generating and matching and comparing the two fingerprints are as follows:
a. contraband fingerprint information KrefGenerating;
b. fingerprint information K of object to be detectediGenerating;
c. and (5) carrying out comparative analysis.
2. The radiation imaging security inspection system based on the random encoding of the liquid metal as claimed in claim 1, wherein in the step a, for contraband, a measurement angle is selected, the system is used for irradiation, when the irradiation starts, modules in the liquid metal shielding screen start to rotate, the rotation motions of the modules are different from each other and do not interfere with each other, 100 times of X-ray total energy deposition information is taken within a certain time range, and the obtained 100X-ray total energy deposition data information forms a fingerprint K of the samplerefTaking n angles to obtain n fingerprints K related to the samplerefAnd the data base is recorded as a reference value of the contraband and used for comparing the measured value of the article to be detected.
3. The radiation imaging security inspection system based on the random encoding of the liquid metal as claimed in claim 1, wherein after all the information in b is recorded into the database, the security inspection system is ready to be used for the security inspection of the specific site, and the same procedure as the first step is carried outIn the generation of contraband fingerprint KrefThe same, the object to be detected is put into the system for detection, and a fingerprint K can be obtained at an irradiation angleiN angles can obtain n fingerprints Ki。
4. The radiation imaging security inspection system based on the random encoding of the liquid metal as claimed in claim 1, wherein after the fingerprint of the object to be inspected is obtained in the step C, the n fingerprints of the object to be inspected are compared with all the fingerprints in the database in sequence to determine whether the object to be inspected is similar to the contraband, and a metric value C is used to perform quantitative analysis on the similarity between the sample to be inspected and the fingerprint K of the contraband;
it is defined as follows:
wherein, KiA fingerprint of the article to be detected, the fingerprint consisting of 100 measured values of total energy deposition;
Kreffingerprint information of contraband;
μ(Kref) And σ (K)ref) Respectively, the mean and standard deviation of a certain angle fingerprint of the contraband.
5. The radiation imaging security inspection system based on the random encoding of the liquid metal as claimed in claim 4, wherein the closer the C value is to 0, the higher the similarity between the two samples is, i.e. the object to be detected may be contraband, and a similarity threshold V is definedthFor a fingerprint of a sample to be detected, the similarity between the fingerprint and fingerprint information in the database is lower than the threshold VthDetermining that the article to be detected does not contain contraband, and if the similarity is higher than VthThe sample to be detected may contain contraband and needs to be further checked, and the similarity threshold value can be automatically adjusted according to the security inspection importance degree of a place.
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Cited By (1)
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