Article Detection Device, Article Detection Method, and Storage Medium

Abstract

The present disclosure provides an article detection device, including a neutron source, a detector, a rotating component, and a processor. The neutron source is configured to release neutrons to a detected article, so that the neutrons undergo neutron nuclear reactions with the detected article and generate gamma rays; the detector is configured to receive the gamma rays and analyze to obtain a detection signal quantity corresponding to the gamma rays; the rotating component is configured to carry the detected article and rotate the detected article relative to the neutron source and the detector; the processor is configured to: control the rotating component to rotate the detected article from an initial angle to at least M predetermined angles in sequence; at least obtain M detection signal quantities respectively corresponding to the M predetermined angles, where M is an integer greater than or equal to 2; and determine an angular orientation of a suspected target substance in the detected article based on the M detection signal quantities and a preset reference signal quantity. The present disclosure also provides an article detection method and a computer-readable storage medium.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of security inspection, and more particularly, to an article detection device, an article detection method, and a storage medium. Background Art

[0002] For purposes of ensuring public safety and reducing illegal crimes, etc., articles need to be subjected to security inspection at places such as airports, railway stations, ports, and logistics checkpoints. The security inspection may include detecting whether there are contraband items such as explosives and drugs in the articles. Existing article detection methods, such as imaging methods and mass spectrometry methods, can relatively accurately detect whether there are contraband items in the articles, but cannot give the spatial position of the contraband items in the articles, and thus cannot provide strong clues for further inspection. Summary of the Invention

[0003] According to embodiments of the present disclosure, an article detection device, an article detection method, and a storage medium are provided.

[0004] In one aspect of the present disclosure, an article detection device is provided, including: a neutron source configured to release neutrons to a detected article so that the neutrons undergo neutron nuclear reactions with the detected article and generate gamma rays; a detector configured to receive the gamma rays and analyze to obtain a detection signal quantity corresponding to the gamma rays; a rotating member configured to carry the detected article and rotate the detected article relative to the neutron source and the detector; and a processor configured to: control the rotating member to rotate the detected article from an initial angle to at least M predetermined angles in sequence; obtain at least M detection signal quantities respectively corresponding to the M predetermined angles, where M is an integer greater than or equal to 2; and determine an angular orientation of a suspected target substance in the detected article based on the M detection signal quantities and a preset reference signal quantity.

[0005] According to an embodiment of the present disclosure, the determining the angular orientation of the suspected target substance in the detected article based on the M detection signal quantities and the preset reference signal quantity includes: obtaining M reference signal quantities respectively corresponding to the M predetermined angles, where the reference signal quantity is pre-determined based on detecting a comparison article that does not contain the target substance; for each of the M predetermined angles, determining an index parameter value based on the detection signal quantity and the reference signal quantity, where the index parameter value represents a ratio of an increment of the detection signal quantity relative to the reference signal quantity to measurement noise; and determining the angular orientation of the suspected target substance in the detected article based on the index parameter values of the M predetermined angles respectively.

[0006] According to an embodiment of the present disclosure, the detector is further configured to analyze the received gamma rays to obtain a gamma energy spectrum; the processor is further configured to: obtain the gamma energy spectrum from the detector; based on the gamma energy spectrum, determine the types of target elements contained in the item to be detected, where the target elements are used to determine the types of the suspected target substances.

[0007] According to an embodiment of the present disclosure, the detector includes N sub-detectors, the N sub-detectors are arranged along the height direction of the item detection device, the N sub-detectors respectively correspond to N predetermined heights, where N is an integer greater than or equal to 2; the processor is further configured to: obtain N detection signal amounts respectively corresponding to the N predetermined heights; based on the N detection signal amounts, determine the height position of the suspected target substance in the item to be detected.

[0008] According to an embodiment of the present disclosure, control the rotating member to rotate the item to be detected from the initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts respectively corresponding to the M predetermined angles includes: obtaining an initial detection signal amount when the item to be detected is at the initial angle; controlling the rotating member to rotate the item to be detected by 180° from the initial angle, and obtaining the detection signal amount when the item to be detected is at 180°.

[0009] According to an embodiment of the present disclosure, control the rotating member to rotate the item to be detected from the initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts respectively corresponding to the M predetermined angles includes: controlling the rotating member to rotate the item to be detected uniformly by 360° from the initial angle, and rotating to a predetermined angle at each predetermined time interval during the rotation of the item to be detected and obtaining the detection signal amount corresponding to the corresponding predetermined angle, where M is an integer greater than or equal to 2.

[0010] According to an embodiment of the present disclosure, the processor is further configured to: obtain an initial detection signal amount when the item to be detected is at the initial angle; based on the initial detection signal amount and a preset reference signal amount, determine an initial index parameter value, where the initial index parameter value is used to characterize the probability that the item to be detected contains a target element; based on the initial index parameter value, determine whether to control the rotation of the item to be detected.

[0011] According to an embodiment of the present disclosure, the processor is further configured to: based on the index parameter values among the M index parameter values that exceed a preset threshold and the preset mass estimation information, determine the content range of the suspected target substance, where the mass estimation information includes the correspondence between the index parameter values and the content ranges.

[0012] According to an embodiment of the present disclosure, determining the types of target substances contained in the item to be detected based on the gamma energy spectrum includes: determining the probability of existence of each target element among a plurality of target elements based on the characteristic peaks in the gamma energy spectrum; and determining the types of target substances contained in the item to be detected based on the probability of existence of each target element.

[0013] In another aspect of the present disclosure, an item detection method executed by the above item detection device is provided, including: using a neutron source to release neutrons to the item to be detected, so that the neutrons undergo neutron nuclear reactions with the item to be detected and generate gamma rays; controlling a rotating member to rotate the item to be detected from an initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts respectively corresponding to the M predetermined angles, where the detection signal amounts are analyzed based on the gamma rays received by a detector, and M is an integer greater than or equal to 2; and determining the angular orientation of a suspected target substance in the item to be detected based on the M detection signal amounts and a preset reference signal amount.

[0014] According to an embodiment of the present disclosure, determining the angular orientation of a suspected target substance in the item to be detected based on the M detection signal amounts and a preset reference signal amount includes: obtaining M reference signal amounts respectively corresponding to the M predetermined angles, where the reference signal amounts are pre-determined based on detecting a comparison item that does not contain a target substance; for each of the M predetermined angles, determining an index parameter value based on the detection signal amount and the reference signal amount, where the index parameter value represents the ratio of the increment of the detection signal amount relative to the reference signal amount to the measurement noise; and determining the angular orientation of the suspected target substance in the item to be detected based on the index parameter values of the M predetermined angles respectively.

[0015] According to an embodiment of the present disclosure, the method further includes: obtaining a gamma energy spectrum, where the gamma energy spectrum is analyzed based on the gamma rays received by the detector; and determining the types of target elements contained in the item to be detected based on the gamma energy spectrum, where the types of target elements are used to determine the types of the suspected target substances.

[0016] According to an embodiment of the present disclosure, the method further includes: obtaining N detection signal amounts respectively corresponding to N predetermined heights, where the N detection signal amounts are respectively obtained by N sub-detectors arranged along the height direction in the detector, and N is an integer greater than or equal to 2; and determining the height position of the suspected target substance in the item to be detected based on the N signal amounts.

[0017] According to an embodiment of the present disclosure, controlling the rotating member to rotate the detected article from an initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts corresponding to the M predetermined angles respectively includes: obtaining an initial detection signal amount when the detected article is at the initial angle; controlling the rotating member to rotate the detected article by 180° from the initial angle, and obtaining a detection signal amount when the detected article is at 180°.

[0018] According to an embodiment of the present disclosure, controlling the rotating member to rotate the detected article from an initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts corresponding to the M predetermined angles respectively includes: controlling the rotating member to rotate the detected article uniformly by 360° from the initial angle, and rotating to a predetermined angle at each predetermined time interval during the rotation of the detected article and obtaining the detection signal amount at the corresponding predetermined angle, where M is an integer greater than or equal to 2.

[0019] According to an embodiment of the present disclosure, the method further includes: obtaining an initial detection signal amount when the detected article is at the initial angle; determining an initial index parameter value based on the initial detection signal amount and a preset reference signal amount, where the initial index parameter value is used to characterize the probability that the detected article contains a target element; determining whether to control the rotation of the detected article based on the initial index parameter value.

[0020] According to an embodiment of the present disclosure, the method further includes: determining a content range of the suspected target substance based on the index parameter values among the M index parameter values that exceed a preset threshold and preset quality estimation information, where the quality estimation information includes a correspondence between the index parameter value and the content range.

[0021] According to an embodiment of the present disclosure, determining the types of target substances contained in the detected article based on the gamma energy spectrum includes: determining the probability of the existence of each target element among a plurality of target elements based on the characteristic peaks in the gamma energy spectrum; determining the types of target substances contained in the detected article based on the probability of the existence of each target element.

[0022] In another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored, and when the computer instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0023] According to an embodiment of the present disclosure, neutrons are used to react with target substances (such as drugs, explosives, etc.) in the item to be detected to generate gamma rays, and the item to be detected is controlled to rotate. During the rotation process, the signal amount of the rays at certain angles (or angle intervals) is detected. Then, the angular orientation of the target substance in the item to be detected can be determined according to the magnitude of the signal amount at each angle, which can provide clues for item search in further inspection. In addition, non-destructive testing using neutrons will not cause damage to the item to be inspected and can meet the requirements of food safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To better understand the embodiments of the present disclosure, the embodiments of the present disclosure will be described in detail with reference to the following drawings:

[0025] Figure 1 Schematically shows an application scenario of an item detection device and method according to an embodiment of the present disclosure;

[0026] Figure 2 Schematically shows a top view structural diagram of an item detection device according to an embodiment of the present disclosure;

[0027] Figure 3 Schematically shows a relationship curve graph of an angle and an index parameter value according to an embodiment of the present disclosure;

[0028] Figure 4A Schematically shows a gamma energy spectrum diagram generated by the reaction of N element with thermal neutrons according to an embodiment of the present disclosure;

[0029] Figure 4B Schematically shows a gamma energy spectrum diagram generated by the reaction of Cl element with thermal neutrons according to an embodiment of the present disclosure;

[0030] Figure 5 Schematically shows a relationship curve graph of an index parameter value and a mass according to an embodiment of the present disclosure;

[0031] Figure 6 Schematically shows a side view structural diagram of an item detection device according to another embodiment of the present disclosure;

[0032] Figure 7 Schematically shows a relationship curve graph of a height and an index parameter value according to an embodiment of the present disclosure;

[0033] Figure 8 Schematically shows two relationship curves of an angle and an index parameter value according to an embodiment of the present disclosure;

[0034] Figure 9 Schematically shows a flowchart of an item detection method according to an embodiment of the present disclosure;

[0035] Figure 10A block diagram schematically showing an article detection device according to an embodiment of the present disclosure; and

[0036] Figure 11 A block diagram schematically showing an electronic device suitable for implementing an article detection method according to an embodiment of the present disclosure. Detailed implementation manners

[0037] Specific embodiments of the present disclosure will be described in detail below. It should be noted that the embodiments described here are only for illustrative purposes and do not limit the embodiments of the present disclosure. In the following description, in order to provide a thorough understanding of the embodiments of the present disclosure, a large number of specific details are set forth. However, it will be apparent to those of ordinary skill in the art that these specific details do not have to be employed to implement the embodiments of the present disclosure. In other instances, well-known structures, materials, or methods have not been specifically described to avoid obscuring the embodiments of the present disclosure.

[0038] Throughout the specification, references to "one embodiment", "an embodiment", "one example", or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present disclosure. Thus, the phrases "in one embodiment", "in an embodiment", "one example", or "an example" appearing throughout the specification do not necessarily all refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics may be combined in any suitable combination and / or sub-combination in one or more embodiments or examples. In addition, those of ordinary skill in the art should understand that the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0039] Embodiments of the present disclosure provide an article detection device, an article detection method, and a storage medium. Among them, the article detection device may include a neutron source, a detector, a rotating member, and a processor. The neutron source is configured to release neutrons to a detected article, so that the neutrons undergo a neutron nuclear reaction with the detected article and generate gamma rays. The detector is configured to receive the gamma rays and analyze to obtain a detection signal amount corresponding to the gamma rays. The rotating member is configured to carry the detected article and rotate the detected article relative to the neutron source and the detector. The processor is configured to: control the rotating member to rotate the detected article from an initial angle to at least M predetermined angles in sequence; at least obtain M detection signal amounts respectively corresponding to the M predetermined angles, where M is an integer greater than or equal to 2; and determine the angular orientation of a suspected target substance in the detected article based on the M detection signal amounts and a preset reference signal amount.

[0040] Figure 1 A schematic diagram showing an application scenario of an article detection device and method according to an embodiment of the present disclosure. It should be noted that Figure 1The following is only an example of a scenario where the embodiments of the present disclosure can be applied, to help those skilled in the art understand the technical content of the present disclosure, but it does not mean that the embodiments of the present disclosure cannot be used in other devices, systems, environments or scenarios.

[0041] As Figure 1 shown, the article detection device 100 can, for example, sequentially detect a batch of cargo boxes (cargo box 1 to cargo box N). One cargo box can be placed into the article detection device 100 at a time, and after the detection is completed, the next cargo box is put in. For example, the cargo box contains palletized fruits, that is, a pallet is placed in the cargo box, and multiple corrugated cardboard boxes containing fruits are stacked on the pallet. The target substances can be, for example, explosives and drugs. After the cargo box is placed into the article detection device 100, the article detection device 100 can detect whether there are explosives and drugs hidden in the cargo box.

[0042] For example, after a certain cargo box is placed in the article detection device 100, the neutron source in the article detection device 100 can release neutrons to the cargo box. The neutrons can undergo neutron nuclear reactions with the substances contained in the cargo box and generate γ (gamma) rays. The detector can receive the γ rays and measure the γ energy spectrum. Since the γ energy spectrum generated by the nuclear reaction corresponds to the types of elements participating in the reaction, the characteristic elements in the article can be accurately identified through the γ energy spectrum. By performing operations such as spectral deconvolution on the γ energy spectrum, it can be determined which elements participate in the reaction to bring about the measured spectral lines, and then it can be preliminarily judged whether there are target substances according to the types of elements. For example, the elements contained in fruits are mainly C (carbon), H (hydrogen), and O (oxygen), while drugs generally contain Cl (chlorine) and N (nitrogen) elements, and explosives contain N elements. Therefore, if Cl and N elements are found in a cargo box containing fruits, it can be preliminarily suspected that the cargo box contains drugs. If N element is found in a cargo box containing fruits but Cl element is not found, it can be preliminarily suspected that the cargo box contains explosives. In addition, the content of each element can also be estimated through the γ energy spectrum. Combining the types and contents of the elements can further judge the types of suspected target substances, or other means can also be used to further determine the types of suspected target substances, such as opening the box for inspection.

[0043] The article detection device 100 according to the embodiments of the present disclosure can not only detect whether there is a suspected target substance hidden in the cargo box, but also determine the angular orientation of the suspected target substance in the cargo box, providing a search clue for further opening the box for inspection. For example, the rotating component of the article detection device 100 can be used to control the rotation of the cargo box relative to the neutron source and the detector. During the rotation, the signal amount of the gamma rays measured at different rotation angles is detected, where the signal amount can refer to the counting rate. Then, based on the detection signal amount at each angle and the magnitude of the reference signal amount at the corresponding angle, the orientation of the suspected target substance in the cargo box is determined, where the reference signal amount can be obtained by detecting a comparison article that does not contain the target substance. For example, the angle with the largest relative increment of the detection signal amount relative to the reference signal amount can be used as the angular orientation of the suspected target substance in the cargo box. If the finally determined angle is 90°, the angular orientation of the suspected target substance is about 90° away from the starting angle after rotation.

[0044] It should be noted that the article detection device and method according to the embodiments of the present disclosure can not only detect cargo boxes, but also detect articles such as suitcases and packages in airports, stations, ports, post offices, logistics checkpoints, and other public places.

[0045] Figure 2 The top view structural schematic diagram of the article detection device according to the embodiments of the present disclosure is schematically shown.

[0046] As Figure 2 shown in the top view, the article detection device 200 may include a neutron source 210, a detector 220, a rotating component 230, and a processor (not shown).

[0047] The neutron source 210 is configured to release neutrons to the article to be detected A, so that the neutrons react with the article to be detected A to generate neutron nuclear reactions and produce gamma rays.

[0048] According to the embodiments of the present disclosure, the nuclear reaction equation using neutrons to react with matter can be, for example, the following formula (1) or (2):

[0049]

[0050]

[0051] Among them, n represents neutrons, X represents the matter contained in the article to be detected, A represents the number of nucleons of the matter X, Z represents the number of protons of the matter X, γ represents gamma rays, and n′ represents neutrons after energy change.

[0052] There are some elements that are prone to react with neutrons, such as Cl element and N element. These elements can be called sensitive elements. Substances containing these sensitive elements can be called substances sensitive to neutron detection, or specific substances, such as explosives and drugs. Whether an element is sensitive to neutrons is related to the cross-section of the element. For elements such as C and O, their cross-sections are small, and neutrons are not easily reacted with them. While for elements such as Cl and N, their cross-sections are large, and neutrons are easily reacted with them.

[0053] According to an embodiment of the present disclosure, the detector 220 is configured to receive gamma rays and analyze the amount of detection signals corresponding to the gamma rays.

[0054] For example, the detector 220 can be a high-purity germanium spectrometer. The detector can measure information such as the gamma energy spectrum corresponding to the gamma rays. Among them, the energy spectrum contains count rate information. The signal amount can, for example, refer to the count rate. The size of the detected signal amount is related to the element type. For example, after the Cl element reacts with neutrons, more gamma rays are generated, so the detected signal amount is relatively large. While after the C element reacts with neutrons, fewer gamma rays are generated, so the detected signal amount is relatively small. In addition, the signal amount is also related to the position of the element in the item to be detected. For example, if the Cl element is located on the side of the item to be detected close to the neutron source and the detector, and there is not too much obstructive substance between the Cl element and the neutron source, the neutrons released by the neutron source can impact the Cl element with a relatively large flux, thus generating more gamma rays, and the detected signal amount is relatively large. If the Cl element is located on the side of the item far from the neutron source and the detector, the neutrons need to pass through a thicker obstructive substance before reaching the Cl element. When the neutrons pass through the obstructive substance, the flux is greatly reduced. At the same time, the generated γ rays also need to pass through a thicker obstructive substance to reach the detector. Therefore, the detected signal amount is relatively small.

[0055] According to an embodiment of the present disclosure, the rotating member 230 is configured to carry the item to be detected A and rotate the item to be detected A relative to the neutron source 210 and the detector 220.

[0056] For example, the rotating member 230 can be a turntable that can rotate around its own central axis. The item to be detected A can be placed at the central position of the rotating member 230. The neutron source 210 and the detector 220 can be fixed relative to the housing 240 of the item detection device 200. The housing 240 can, for example, be a shielding wall with a shielding effect. In addition, the item detection device can also be provided with a protective door 250 connected to the housing 240. The protective door 250 and the housing 240 enclose a detection chamber 260, and the rotating member 230 is located in the detection chamber 260.

[0057] According to an embodiment of the present disclosure, the rotating member 230 can, for example, rotate at least 360°, that is, can drive the item to be detected A to rotate at least one full circle, so that all orientations of the item to be detected A can be detected.

[0058] According to an embodiment of the present disclosure, the processor is configured to: control the rotating member to rotate the item to be detected from an initial angle to at least M predetermined angles in sequence; obtain at least M detection signal amounts respectively corresponding to the M predetermined angles, where M is an integer greater than or equal to 2; and determine the angular orientation (also referred to as the azimuth angle) of the suspected target substance in the item to be detected based on the M detection signal amounts and a preset reference signal amount.

[0059] For example, when placing the item to be detected A, a certain specific mark of the item to be detected A can be oriented towards the detector 220, and the angle when the specific mark of the item to be detected A faces the detector 220 can be used as the initial angle. The initial angle can be marked as 0° for example, and the M predetermined angles can be several angles evenly distributed within the range of 0° to 360°, for example, can include: 0°, 60°, 120°, 180°, 240°, 300°. Control the rotating member 230 to rotate the item to be detected A from the initial angle to at least M predetermined angles in sequence, and use the detector 220 to detect the signal amount at each predetermined angle to obtain the detection signal amount corresponding to each predetermined angle. According to an embodiment of the present disclosure, each predetermined angle can also represent an angle interval. For example, 60° can represent the interval [30° - 90°], 180° can represent the interval [150° - 210°]. In this case, the detector 220 measures the detection signal amounts corresponding to several angle intervals.

[0060] Then, based on the M detection signal amounts corresponding to the M predetermined angles and the preset reference signal amount, determine the angular orientation of the suspected target substance in the item to be detected A. Since the item to be detected is not isotropic, the reference signal amounts at each predetermined angle can be obtained by pre-detecting a comparison item that does not contain the target substance. Then, when detecting the item to be detected, the comparison result between the detection signal amount and the reference signal amount at the corresponding angle can be used as a condition for judging the azimuth angle where the target substance is located. For example, the predetermined angle with the most significant increment of the detection signal amount relative to the reference signal amount can be used as the azimuth angle of the suspected target substance in the item to be detected A.

[0061] According to an embodiment of the present disclosure, neutrons are used to react with target substances (such as drugs, explosives, etc.) in the item to be detected to generate gamma rays, and the item to be detected is controlled to rotate. During the rotation process, the signal amount of the rays at certain angles (or angle intervals) is detected. Then, the angular orientation of the target substance in the item to be detected can be determined based on the magnitudes of the detection signal amounts and the reference signal amounts at each angle, which can provide clues for item search in further inspection. In addition, non-destructive testing using neutrons will not cause damage to the item to be inspected and can meet the requirements of food safety.

[0062] According to an embodiment of the present disclosure, determining the angular orientation of a suspected target substance in the item to be detected based on M detection signal amounts and a preset reference signal amount includes: obtaining M reference signal amounts respectively corresponding to M predetermined angles, where the reference signal amounts are pre-detected based on the detection of a comparison item that does not contain the target substance; for each of the M predetermined angles, determining an index parameter value based on the detection signal amount and the reference signal amount, where the index parameter value represents the ratio of the increment of the detection signal amount relative to the reference signal amount to the measurement noise; and determining the angular orientation of the suspected target substance in the item to be detected based on the index parameter values of the M predetermined angles respectively.

[0063] For example, the reference signal amount can be obtained by pre-detecting a comparison item that does not contain the target substance and has the same specifications and similar contents as the item to be detected A. According to an embodiment of the present disclosure, the degree of change of the detection signal amount relative to the reference signal amount can be used as a criterion for determining the orientation of the suspected target substance. For example, at a certain predetermined angle, the reference signal amount corresponding to the comparison item is N 0 , and the detection signal amount corresponding to the item to be detected A is N 1 . According to the law of Poisson distribution, the calculation formula for the index parameter value k can be shown as the following formula (3):

[0064]

[0065] where N 1 -N 0 can represent the increment of the detection signal amount relative to the reference signal amount, and can represent the measurement noise.

[0066] According to an embodiment of the present disclosure, the index parameter value k can be used as a reference value for the probability that the item to be detected contains the target substance. For example, when k = 1, it can be considered that there is a 68.3% probability of the existence of the target substance; when k = 2, it can be considered that there is a 95.5% probability of the existence of the target substance; when k = 3, it can be considered that there is a 99.7% probability of the existence of the target substance.

[0067] During the rotation of the item to be detected, the change of the k value can be monitored in real time. If the k value exceeds the preset threshold (for example, the preset threshold is 1.5) when the item to be detected rotates to a certain angle, it can be preliminarily determined that there is a target substance in the item to be detected, and the device can control the alarm device to send an alarm message to prompt the staff. On the contrary, if the k value is always below the preset threshold after the item to be detected rotates one week, it can be preliminarily considered that the item to be detected does not contain the target substance and there is no need to alarm.

[0068] Based on the above method, the index parameter values corresponding to each predetermined angle can be obtained, and then the azimuth angle of the suspected target substance in the item to be detected can be determined according to the M index parameter values. For example, the angle corresponding to the largest index parameter value among the M index parameter values can be selected as the azimuth angle of the suspected target substance in the item to be detected A.

[0069] In another embodiment of the present disclosure, a relationship curve between the M predetermined angles and the M index parameter values can also be drawn, and the angle corresponding to the peak value of the index parameter in the relationship curve can be used as the azimuth angle of the suspected target substance in the item to be detected A.

[0070] Figure 3 Schematically shows a relationship curve graph of the angle and the index parameter value according to an embodiment of the present disclosure.

[0071] As Figure 3 shown, a relationship curve 301 is drawn using multiple angles (0°, 60°, 120°, 180°, 240°, 300°) and the index parameter values corresponding to each angle. The peak value 302 of the index parameter in the curve 301 and the angle 303 corresponding to the peak value 302 can be found through an algorithm. The angle 303 can be used as the angle of the suspected target substance in the item to be detected, or the angle range where the angle 303 is located can be used as the angle range of the suspected target substance in the item to be detected.

[0072] According to an embodiment of the present disclosure, taking the significance degree of the increment of the detection signal amount relative to the reference signal amount as the criterion for determining the azimuth of the suspected target substance is simple to calculate and can improve the accuracy of judgment.

[0073] In another embodiment of the present disclosure, the index parameter value can also be expressed as the increment percentage of the detection signal amount relative to the reference signal amount.

[0074] According to an embodiment of the present disclosure, the detector is further configured to analyze the received gamma rays to obtain a gamma energy spectrum. The processor is further configured to: obtain the gamma energy spectrum from the detector; based on the gamma energy spectrum, determine the types of target elements contained in the item to be detected, and the target elements are used to determine the types of suspected target substances.

[0075] According to an embodiment of the present disclosure, when each element reacts with neutrons in accordance with the above formula (1) or formula (2), the resulting γ energy spectrum is unique, and the γ energy spectrum is equivalent to the fingerprint of the element participating in the reaction. Among them, the neutrons may refer to thermal neutrons or cold neutrons. Since the energy difference between cold neutrons and thermal neutrons is very small, the γ energy spectrum generated by the reaction of cold neutrons with matter is the same as that generated by the reaction of thermal neutrons.

[0076] Figure 4A Schematically shows a schematic diagram of the γ energy spectrum generated by the reaction of element N with thermal neutrons according to an embodiment of the present disclosure.

[0077] Figure 4B Schematically shows a schematic diagram of the γ energy spectrum generated by the reaction of element Cl with thermal neutrons according to an embodiment of the present disclosure.

[0078] As Figure 4A and Figure 4B shown, there are significant differences between the γ energy spectrum corresponding to element N and the γ energy spectrum corresponding to element Cl. When multiple elements are present in the substance to be detected, the measured γ energy spectrum is the result of the superposition of the γ energy spectra of multiple elements. The characteristic peaks of each element can be identified through algorithms. The energy regions where the characteristic peaks of different elements are located are different. Therefore, the type of element can be determined based on the characteristic peaks, and then it can be analyzed which elements participated in the reaction to bring the measured spectral line. Once the elements participating in the reaction are determined, the target substance present in the item to be detected can be preliminarily judged. For example, if elements Cl and N are found in a cargo box containing fruits, it can be initially suspected that the cargo box contains drugs. If element N is found in a cargo box containing fruits but element Cl is not found, it can be initially suspected that the cargo box contains explosives.

[0079] According to an embodiment of the present disclosure, some other non-target substances may also contain sensitive elements such as Cl and N. For example, table salt contains elements Cl and Na. In this case, it can be specifically distinguished in combination with the application scenario. For example, if the detection personnel are informed that the item to be detected is fruits, it is very suspicious if elements Cl and N are found during the detection, and it can be suspected that drugs are hidden in the fruits. If the detection personnel are informed that the item to be detected is table salt, then other elements can be combined for judgment during the detection. For example, if the content ratio of elements Cl and Na meets the component ratio of table salt and element N is not detected, it can be initially considered that there are no drugs and explosives, or other means can also be combined for analysis.

[0080] According to an embodiment of the present disclosure, determining the types of target substances contained in the item to be detected based on gamma spectroscopy may further include: determining the probability of existence of each target element among a plurality of target elements based on the characteristic peaks in the gamma spectroscopy; and determining the types of target substances contained in the item to be detected and the possibility of the existence of the target substances based on the probability of existence of each target element.

[0081] For example, if the Cl element exists in the item to be detected, the γ spectroscopy measured by the detector will include multiple characteristic peaks of the Cl element. Several relatively prominent characteristic peaks can be selected, and the probability of the existence of the Cl element can be determined using these several characteristic peaks. Specifically, the following method (1) or (2) can be used for determination:

[0082] (1) For each selected prominent characteristic peak, obtain the counting rate of the energy interval where each characteristic peak is located, and obtain the reference counting rate corresponding to the energy interval of each characteristic peak in the comparison spectroscopy. Here, the comparison spectroscopy can refer to the γ spectroscopy of a cargo box with the same size as the item to be detected and of the same type of item and without the target substance. Then, the k value corresponding to each characteristic peak is calculated using the above formula (3). After that, the k values corresponding to each characteristic peak can be weighted and summed to obtain the final k value corresponding to the Cl element. Among them, the weights of each characteristic peak can be determined according to the height of the characteristic peak. For example, the higher the peak value, the greater the weight.

[0083] (2) For several selected characteristic peaks, the sum of the counting rates corresponding to these several characteristic peaks can be used as N 1 , and the sum of the counting rates in the corresponding energy interval of the comparison spectroscopy can be used as N 0 , and the value calculated using the above formula (3) can be used as the k value corresponding to the Cl element.

[0084] If the probability of the existence of the Cl element is greater than a certain preset threshold, it can be considered that the Cl element exists.

[0085] According to an embodiment of the present disclosure, neutrons can be used to react with the elements in the item to be detected to obtain γ spectroscopy, and the types of elements contained in the item to be detected can be analyzed based on the γ spectroscopy. Furthermore, the types of target substances can be judged according to the types of elements, overcoming the problem that the imaging method and other item detection methods in the related art cannot judge the types of target substances.

[0086] According to an embodiment of the present disclosure, when deconvolving the γ energy spectrum measured by the detector, a comparison energy spectrum is sometimes required. The comparison energy spectrum refers to the γ energy spectrum obtained by previously detecting a comparison article that does not contain the target substance and has the same specifications and similar contents as the article to be detected. By removing the comparison energy spectrum from the energy spectrum of the article to be detected, the energy spectra of other elements can be obtained. In the scenario where the article to be detected is a cargo box containing palletized fruits, the comparison energy spectrum can be the γ energy spectrum of the same-sized similar fruits and the cargo box under the condition of having confirmed no suspicious substances, or a classified average spectrum. The classified average spectrum means that the energy spectra of multiple obtained comparison articles are classified and averaged to obtain the classified average spectrum, and the suspicious energy spectra can be removed by combining algorithms to improve the accuracy of the classified average spectrum.

[0087] According to an embodiment of the present disclosure, the above-mentioned processor controls the rotating component to rotate the article to be detected from the initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts respectively corresponding to the M predetermined angles may include: obtaining the initial detection signal amount when the article to be detected is at the initial angle; controlling the rotating component to rotate the article to be detected by 180° from the initial angle, and obtaining the detection signal amount when the article to be detected is at 180°.

[0088] For example, detection can be performed only on the opposite sides of the article to be detected. After the article to be detected is placed in the article detection device, the initial signal amount at the initial angle can be detected first, and the initial signal amount at the initial angle and the reference signal amount are substituted into the above formula (3) to obtain the initial index parameter value k 1 . Then, the article to be detected is rotated by 180°, the other side is detected to obtain the detection signal amount at 180°, and the detection signal amount at the 180° angle and the reference signal amount are substituted into the above formula (3) to obtain the index parameter value k at the 180° angle 2 . Then, the orientation of the target substance can be determined according to the k values on both sides. Based on this detection method, the detection efficiency can be improved while ensuring a certain detection accuracy.

[0089] According to another embodiment of the present disclosure, the above-mentioned processor controls the rotating component to rotate the article to be detected from the initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts respectively corresponding to the M predetermined angles includes: controlling the rotating component to rotate the article to be detected uniformly by 360° from the initial angle, and rotating to a predetermined angle at each predetermined time interval during the rotation of the article to be detected and obtaining the detection signal amount corresponding to the corresponding predetermined angle, where M is an integer greater than or equal to 2.

[0090] For example, the item to be detected can be rotated uniformly by 360°, and detected while rotating. It is detected once every predetermined time period (e.g., 2 s) until it rotates 360° and returns to the initial angle. According to the rotation speed and the detection time, the angle corresponding to each detection can be determined. Therefore, the detection signal amounts corresponding to M predetermined angles can be obtained. Then, the k value at each predetermined angle is calculated, and the orientation of the target substance is determined based on the k values of each predetermined angle. Based on this detection method, the detection accuracy can be improved, and the azimuth angle of the target substance can be accurately determined.

[0091] According to another embodiment of the present disclosure, the processor is further configured to: obtain an initial detection signal amount when the item to be detected is at the initial angle; determine an initial index parameter value based on the initial detection signal amount and a preset reference signal amount, where the initial index parameter value is used to characterize the probability that the item to be detected contains a target element; and determine whether to control the rotation of the item to be detected based on the initial index parameter value.

[0092] For example, after the item to be detected is placed in the item detection device, the initial signal amount can be detected first, and the initial signal amount and the reference signal amount are substituted into the above formula (3) to obtain the initial index parameter value. This initial index parameter value can be used as the initial probability that there are other neutron-sensitive elements (such as Cl, N elements) in the item to be detected in addition to known elements (such as C, O elements).

[0093] When the initial index parameter value is less than a certain preset threshold (the preset threshold is, for example, 1), it can be preliminarily considered that there is no target substance in the item to be detected, and there is no need to rotate the item to be detected. On the contrary, when the initial index parameter value is greater than or equal to the preset threshold, it can be preliminarily considered that there is a target substance in the item to be detected, and it is necessary to further control the rotation of the item to be detected to determine the angular orientation of the target substance in the item to be detected. Based on this solution, the efficiency of item detection can be improved.

[0094] In another embodiment of the present disclosure, it is also possible not to consider the magnitude of the initial index parameter value, and rotate and detect the item to be detected regardless of the magnitude of the initial index parameter value. For example, when the initial index parameter value is less than the preset threshold, it can be considered that there is no target substance only within this angle range of the item to be detected, and the item can be rotated to detect other angles. On the contrary, when the initial index parameter value is greater than or equal to the preset threshold, it can be considered that there is a target substance within this angle range of the item to be detected, and it is possible to further control the rotation of the item to be detected to determine whether there is also a target substance at other angular orientations in the item to be detected, and determine the azimuth angle of the target substance.

[0095] According to an embodiment of the present disclosure, the processor is further configured to: determine a content range of a suspected target substance based on the metric parameter values that exceed a preset threshold among the M metric parameter values and preset quality estimation information, where the quality estimation information includes the correspondence between the metric parameter values and the content ranges.

[0096] For example, during the rotation of the item to be detected, if at a certain angle, the k value exceeds the preset threshold and causes the device to alarm, the preset quality estimation information can be queried using the k value that exceeds the threshold to obtain the content range of the target substance.

[0097] According to an embodiment of the present disclosure, after the metric parameter value k exceeds a certain threshold, there is a positive correlation between the magnitude of the k value and the amount of the target substance, that is, the larger the k value, the greater the mass of the target substance. A corresponding relationship curve between the metric parameter value k and the mass of the target substance can be made in advance at the position where it is most difficult to detect the target item. Among them, the position where it is most difficult to detect can be, for example, the position where the target substance is located in the item to be detected far from the neutron source and the detector. Similarly, at the position where it is easiest to detect the item of concern, a corresponding relationship curve between the metric parameter value k and the mass of the target substance can also be made through experiments. Among them, the position where it is easiest to detect can be, for example, the position where the target substance is located in the item to be detected close to the neutron source and the detector.

[0098] Figure 5 Schematically shows a relationship curve graph between the metric parameter value and the content according to an embodiment of the present disclosure.

[0099] As Figure 5 shown, a mass upper limit curve 501 and a mass lower limit curve 502 can be obtained. Among them, the mass upper limit curve 501 can be, for example, a corresponding relationship curve between the metric parameter value k and the mass of the target substance made at the position where it is most difficult to detect the item of concern, and the mass lower limit curve 502 can be, for example, a corresponding relationship curve between the metric parameter value k and the mass of the target substance made at the position where it is easiest to detect the item of concern.

[0100] If, when performing a rotational detection on a certain item to be detected, the k value measured at a certain angle exceeds the alarm threshold, then the estimated range of the amount of the item of concern can be given by these two curves. For example, if the measured metric parameter value k is 2.5, then it can be determined that the content of the target substance in the item to be detected is between [w1, w2].

[0101] Figure 6 Schematically shows a side view structural schematic diagram of an item detection device 600 according to another embodiment of the present disclosure.

[0102] As Figure 6As shown in the side view, according to an embodiment of the present disclosure, the article detection device 600 may also include a neutron source 610, a detector 621, and a rotating member 630. Among them, the detector 620 may include N sub-detectors 621, and the N sub-detectors 621 are arranged along the height direction of the article detection device 600. The N sub-detectors 621 respectively correspond to N predetermined heights, where N is an integer greater than or equal to 2. The processor is further configured to: obtain N detection signal amounts respectively corresponding to the N predetermined heights; and determine the height position of the suspected target substance in the article A to be detected based on the N detection signal amounts.

[0103] For example, the detector 620 is a detector array component composed of multiple sub-detectors. The multiple sub-detectors are arranged along the height direction and respectively receive rays at different heights. For example, the detector 620 may include 10 sub-detectors 621, and the 10 sub-detectors 621 are respectively arranged at heights with a height difference of h1, h2, h3, h4, h5, h6, h7, h8, h9, h10 from the bearing surface of the rotating member 630. Each sub-detector 621 can analyze and obtain the detection signal amount corresponding to the corresponding height. Then, for each predetermined height, an index parameter value corresponding to the corresponding height can be calculated based on the detection signal amount and the reference signal amount. Furthermore, the height position of the suspected target substance in the article A to be detected can be determined according to the index parameter value k corresponding to each height. For example, the height corresponding to the largest index parameter value among the N index parameter values can be selected as the height of the suspected target substance in the article A to be detected. According to an embodiment of the present disclosure, each predetermined height may also represent a height interval. In this case, the signal amount measured by each sub-detector 621 is the signal amount corresponding to a height interval.

[0104] Since the properties of the article to be detected are also different at different heights, a comparison article that does not contain the target substance can be detected in advance to obtain the reference signal amounts at each predetermined height. Then, when the article to be detected is detected, the comparison result between the detection signal amount and the reference signal amount at the corresponding height can be used as the condition for judging the height where the target substance is located. For example, the predetermined height at which the increment of the detection signal amount relative to the reference signal amount is the most significant can be used as the height of the suspected target substance in the article A to be detected.

[0105] In another embodiment of the present disclosure, a relationship curve can be drawn using the N heights and their corresponding N index parameter values, and the height corresponding to the peak value of the index parameter in the relationship curve can be used as the height of the suspected target substance in the article A to be detected.

[0106] Figure 7 Schematically shows a relationship curve diagram of height and index parameter value according to an embodiment of the present disclosure.

[0107] As Figure 7As shown, a relationship curve 701 is plotted using multiple heights (h1 to h10) and the corresponding index parameter values at each height. The peak 702 of the index parameter in curve 701 and the height 703 corresponding to this peak 702 can be found through an algorithm, and this height 703 can be used as the height of the suspected target substance in the item being detected.

[0108] According to an embodiment of the present disclosure, signal amounts measured by multiple detectors at different heights can be obtained, and then the height of the suspected target substance in the item being detected can be determined based on the relative increment magnitude of the detection signal amount relative to the reference signal amount. Combining with the angle, the position of the suspected target substance in the item being detected can be accurately determined.

[0109] According to an embodiment of the present disclosure, it can be determined whether the suspected target substance is located in the central region or the edge region of the item being detected based on the smoothness of the curve of the index parameter value k along the angle change curve. That is to say, the radial range of the suspected target substance on the rotation plane can be judged according to the smoothness of the change of the index parameter value k with the angle. The radial range can refer to the distance range of the suspected target substance from the central axis of the item being detected in the radial direction. Through this solution, the position of the suspected target substance can be further clarified.

[0110] Figure 8 Two relationship curves of the angle and the index parameter value according to an embodiment of the present disclosure are schematically shown.

[0111] As Figure 8 shown, the smoother the curve of the k value along the angle change, the closer the target substance is to the central axis of the item being detected in the radial direction, as shown by curve 801; conversely, the more drastic the curve of the k value along the angle change, the closer the target substance is to the surface of the item being detected in the radial direction, as shown by curve 802.

[0112] According to an embodiment of the present disclosure, it is possible to detect whether there is a suspected target substance in the item being detected. Further, if there is a suspected target substance, the angle and / or height and / or approximate position in the radial direction of the suspected target substance can be located, and the mass of the suspected target substance can be roughly estimated. It can effectively detect explosives, which has important practical significance in anti-terrorism and homeland security; it can also effectively detect drugs and has strong application prospects in the field of drug interdiction. In particular, it is especially effective for detecting drugs or explosives hidden in items such as fruit trays. For the situation where the suspected target substance may be evenly distributed within the item to be inspected, after turning off the positioning function, this item detection device still has a wide range of applications, such as for detecting valuable components in minerals and analyzing their content, and analyzing the salt content in concrete, etc.

[0113] Another aspect of the embodiments of the present disclosure provides an item detection method performed by the above item detection device.

[0114] Figure 9 A flowchart schematically showing an article detection method according to an embodiment of the present disclosure is shown.

[0115] As Figure 9 shown, the article detection method includes operations S910 to S940.

[0116] In operation S910, a neutron source is used to release neutrons to the article to be detected, so that neutrons undergo a neutron nuclear reaction with the article to be detected and generate gamma rays.

[0117] In operation S920, a rotating member is controlled to rotate the article to be detected from an initial angle to at least M predetermined angles in sequence.

[0118] In operation S930, at least M detection signal amounts corresponding to the M predetermined angles are obtained, and the detection signal amounts are obtained based on the gamma rays received by a detector, where M is an integer greater than or equal to 2.

[0119] In operation S940, based on the M detection signal amounts and a preset reference signal amount, the angular orientation of a suspected target substance in the article to be detected is determined.

[0120] According to an embodiment of the present disclosure, determining the angular orientation of a suspected target substance in the article to be detected based on the M detection signal amounts and the preset reference signal amount includes: obtaining M reference signal amounts respectively corresponding to the M predetermined angles, where the reference signal amounts are pre-obtained based on the detection of a comparison article that does not contain the target substance; for each of the M predetermined angles, determining an index parameter value based on the detection signal amount and the reference signal amount, where the index parameter value represents the ratio of the increment of the detection signal amount relative to the reference signal amount to the measurement noise; and determining the angular orientation of the suspected target substance in the article to be detected based on the index parameter values of the M predetermined angles respectively.

[0121] According to an embodiment of the present disclosure, the article detection method further includes: obtaining a gamma energy spectrum, where the gamma energy spectrum is obtained based on the gamma rays received by a detector; and determining the types of target elements contained in the article to be detected based on the gamma energy spectrum, and the types of target elements are used to determine the types of suspected target substances.

[0122] According to an embodiment of the present disclosure, the article detection method further includes: obtaining N detection signal amounts respectively corresponding to N predetermined heights, and the N detection signal amounts are respectively obtained by N sub-detectors arranged along the height direction in the detector, where N is an integer greater than or equal to 2; and determining the height position of the suspected target substance in the article to be detected based on the N signal amounts.

[0123] According to an embodiment of the present disclosure, a rotating member is controlled to rotate an item to be detected from an initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts corresponding to the M predetermined angles respectively includes: obtaining an initial detection signal amount when the item to be detected is at the initial angle; controlling the rotating member to rotate the item to be detected by 180° from the initial angle, and obtaining a detection signal amount when the item to be detected is at 180°.

[0124] According to an embodiment of the present disclosure, a rotating member is controlled to rotate an item to be detected from an initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal amounts corresponding to the M predetermined angles respectively includes: controlling the rotating member to rotate the item to be detected uniformly by 360° from the initial angle, and rotating the item to be detected to a predetermined angle at each predetermined time interval during the rotation of the item to be detected and obtaining a detection signal amount corresponding to the corresponding predetermined angle, where M is an integer greater than or equal to 2.

[0125] According to an embodiment of the present disclosure, the item detection method further includes: obtaining an initial detection signal amount when the item to be detected is at the initial angle; determining an initial index parameter value based on the initial detection signal amount and a preset reference signal amount, where the initial index parameter value is used to characterize the probability that the item to be detected contains a target element; determining whether to control the rotation of the item to be detected based on the initial index parameter value.

[0126] According to an embodiment of the present disclosure, the item detection method further includes: determining a content range of a suspected target substance based on the index parameter values exceeding a preset threshold among the M index parameter values and preset quality estimation information, where the quality estimation information includes the corresponding relationship between the index parameter value and the content range.

[0127] According to an embodiment of the present disclosure, determining the types of target substances contained in the item to be detected based on gamma energy spectrum includes: determining the probability of the existence of each target element among a plurality of target elements based on the characteristic peaks in the gamma energy spectrum; determining the types of target substances contained in the item to be detected based on the probability of the existence of each target element.

[0128] Figure 10 A block diagram of an item detection device according to an embodiment of the present disclosure is schematically shown.

[0129] As Figure 10 shown, the item detection device 1000 may include: a first control module 1010, a second control module 1020, an acquisition module 1030, and a determination module 1040.

[0130] The first control module 1010 is configured to release neutrons to the item to be detected by using a neutron source, so that neutrons undergo neutron nuclear reactions with the item to be detected and generate gamma rays.

[0131] The second control module 1020 is configured to control the rotating component to rotate the item to be detected from the initial angle to at least M predetermined angles in sequence.

[0132] The acquisition module 1030 is configured to acquire at least M detection signal quantities respectively corresponding to the M predetermined angles. The detection signal quantity is obtained by analyzing the gamma rays received by the detector, where M is an integer greater than or equal to 2.

[0133] The determination module 1040 is configured to determine the angular orientation of the suspected target substance in the item to be detected based on the M detection signal quantities and a preset reference signal quantity.

[0134] According to embodiments of the present disclosure, any multiple of the modules, sub-modules, units, and sub-units, or at least part of the functions of any multiple of them, can be implemented in one module. Any one or more of the modules, sub-modules, units, and sub-units according to embodiments of the present disclosure can be split into multiple modules for implementation. Any one or more of the modules, sub-modules, units, and sub-units according to embodiments of the present disclosure can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on chip, a system on substrate, a system on package, an application specific integrated circuit (ASIC), or can be implemented by any other reasonable way of integrating or packaging the circuit in hardware or firmware, or implemented in any one of the three implementation manners of software, hardware, and firmware, or in an appropriate combination of any several of them. Alternatively, one or more of the modules, sub-modules, units, and sub-units according to embodiments of the present disclosure can be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding functions can be executed.

[0135] It should be noted that the part of the item detection device in the embodiments of the present disclosure corresponds to the part of the item detection method in the embodiments of the present disclosure. For the description of the item detection device part, please refer to the item detection method part specifically, and details will not be repeated here.

[0136] Figure 11 A block diagram of an electronic device suitable for implementing the method described above according to an embodiment of the present disclosure is schematically shown. Figure 11 The electronic device shown is only an example, and should not bring any limitation to the functions and usage scope of the embodiments of the present disclosure.

[0137] As Figure 11 shown, the electronic device 1100 includes a processor 1110 and a computer-readable storage medium 1120. The computer system 1100 can execute the method according to an embodiment of the present disclosure.

[0138] Specifically, the processor 1110 may include, for example, a general - purpose microprocessor, an instruction - set processor, and / or a related chipset, and / or a dedicated microprocessor (e.g., an application - specific integrated circuit (ASIC)), and so on. The processor 1110 may also include on - board memory for caching purposes. The processor 1110 may be a single processing unit or multiple processing units for performing different actions of the method flow according to the embodiments of the present disclosure.

[0139] The computer - readable storage medium 1120 may be, for example, a non - volatile computer - readable storage medium. Specific examples include, but are not limited to: magnetic storage devices, such as magnetic tapes or hard disk drives (HDDs); optical storage devices, such as compact discs (CD - ROMs); memories, such as random - access memories (RAMs) or flash memories; and so on.

[0140] The computer - readable storage medium 1120 may include a computer program 1121, and the computer program 1121 may include code / computer - executable instructions that, when executed by the processor 1110, cause the processor 1110 to execute the method according to the embodiments of the present disclosure or any variation thereof.

[0141] The computer program 1121 may be configured to have computer - program code that includes, for example, computer - program modules. For example, in an exemplary embodiment, the code in the computer program 1121 may include one or more program modules, such as module 1121A, module 1121B,.... It should be noted that the way of dividing the modules and the number of modules are not fixed. Those skilled in the art can use appropriate program modules or combinations of program modules according to the actual situation. When these combinations of program modules are executed by the processor 1110, the processor 1110 can execute the method according to the embodiments of the present disclosure or any variation thereof.

[0142] According to an embodiment of the present invention, at least one of the first control module 1010, the second control module 1020, the acquisition module 1030, and the determination module 1040 may be implemented as a computer - program module as described in Figure 11 reference, which, when executed by the processor 1110, can implement the corresponding operations described above.

[0143] Another aspect of the embodiments of the present disclosure also provides a computer - readable storage medium, which is applied to the above - mentioned article detection device. The computer - readable storage medium stores executable instructions that, when executed by a processor, cause the processor to implement the above - mentioned article detection method.

[0144] The present disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the foregoing embodiments; or may exist independently without being assembled into the device / apparatus / system. The foregoing computer-readable storage medium carries one or more programs, and when the one or more programs are executed, the methods according to the embodiments of the present disclosure are implemented.

[0145] According to an embodiment of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, it may include but is not limited to: portable computer disks, hard disks, random access memories (RAMs), read-only memories (ROMs), erasable programmable read-only memories (EPROMs or flash memories), portable compact disk read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In the present disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program, and the program may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0146] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the foregoing module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combinations of blocks in the block diagram or flowchart, may be implemented by a dedicated hardware-based system for performing the specified functions or operations, or may be implemented by a combination of dedicated hardware and computer instructions.

[0147] Those skilled in the art can understand that the features recited in the various embodiments and / or claims of the present disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly recited in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features recited in the various embodiments and / or claims of the present disclosure can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present disclosure.

[0148] Although the present disclosure has been shown and described with reference to particular exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the appended claims but also by equivalents of the appended claims.

Claims

1. An article detection device, comprising: a neutron source configured to release neutrons to a detected article, so that the neutrons undergo neutron nuclear reactions with the detected article and generate gamma rays; a detector configured to receive the gamma rays and analyze to obtain a detection signal quantity corresponding to the gamma rays; a rotating member configured to carry the detected article and rotate the detected article relative to the neutron source and the detector; and a processor configured to: control the rotating member to rotate the detected article from an initial angle to at least M predetermined angles in sequence, where M is an integer greater than or equal to 2; obtain at least M detection signal quantities respectively corresponding to the M predetermined angles; and determine the angular orientation of a suspected target substance in the detected article based on the M detection signal quantities and a preset reference signal quantity; wherein, determining the angular orientation of the suspected target substance in the detected article based on the M detection signal quantities and the preset reference signal quantity includes: obtaining M reference signal quantities respectively corresponding to the M predetermined angles, where the reference signal quantity is pre-obtained based on detecting a comparison article that does not contain a target substance; for each of the M predetermined angles, determining an index parameter value based on the detection signal quantity and the reference signal quantity, where the index parameter value represents the ratio of the increment of the detection signal quantity relative to the reference signal quantity to the measurement noise; and determining the angular orientation of the suspected target substance in the detected article based on the index parameter values of the M predetermined angles respectively; the processor is further configured to determine the polar radius range of the suspected target substance on the rotation plane according to the smoothness of the change of the index parameter value with the angle, and the polar radius range includes the distance range of the suspected target substance from the central axis of the detected article in the radial direction.

2. The device according to claim 1, wherein: the detector is further configured to analyze a gamma energy spectrum based on the received gamma rays; the processor is further configured to: obtain the gamma energy spectrum from the detector; determine the types of target elements contained in the detected article based on the gamma energy spectrum, and the target elements are used to determine the types of the suspected target substance.

3. The device according to claim 1 or 2, wherein: the detector includes N sub-detectors, the N sub-detectors are arranged along the height direction of the article detection device, and the N sub-detectors respectively correspond to N predetermined heights, where N is an integer greater than or equal to 2; the processor is further configured to: obtain N detection signal quantities respectively corresponding to the N predetermined heights; determine the height position of the suspected target substance in the detected article based on the N detection signal quantities.

4. The device according to claim 1 or 2, wherein, controlling the rotating member to rotate the detected article from the initial angle to at least M predetermined angles in sequence; obtaining at least M detection signal quantities respectively corresponding to the M predetermined angles includes: obtaining an initial detection signal quantity when the detected article is at the initial angle; The rotating component is controlled to rotate the detected object by 180° from an initial angle, and a detection signal amount is obtained when the detected object is at 180°.

5. The device according to claim 1 or 2, in, Controlling the rotating component to rotate the detected object from an initial angle to at least M predetermined angles in sequence; Obtaining at least M detection signal quantities respectively corresponding to the M predetermined angles comprises: The rotating component is controlled to rotate the detected object 360° at a constant speed from an initial angle, and during the rotation of the detected object, the detected object is rotated to a predetermined angle at a predetermined time interval and the detection signal amount at the corresponding predetermined angle is obtained, wherein M is an integer greater than or equal to 2.

6. The device according to claim 1 or 2, in, The processor is further configured to: Obtaining an initial detection signal amount when the detected object is located at the initial angle; Based on the initial detection signal amount and the preset reference signal amount, determining an initial indicator parameter value, wherein the initial indicator parameter value is used to characterize the probability that the detected object contains the target element; Based on the initial indicator parameter value, it is determined whether to control the detected object to rotate.

7. The device according to claim 1, in, The processor is further configured to: Based on the index parameter value exceeding the preset threshold value among the M index parameter values ​​and the preset mass estimation information, determining the content range of the suspected target substance, The quality estimation information includes the corresponding relationship between the index parameter value and the content range.

8. The device according to claim 2, in, Determining the type of the target substance contained in the detected object based on the gamma spectrum includes: Determining the probability of existence of each target element among a plurality of target elements based on characteristic peaks in the gamma spectrum; Based on the probability of existence of each target element, the type of the target substance contained in the detected object is determined.

9. An object detection method performed by the object detection device according to claim 1, include: Using a neutron source to release neutrons to the object to be tested, so that the neutrons react with the object to be tested and generate gamma rays; Controlling the rotating component to rotate the detected object from an initial angle to at least M predetermined angles in sequence; At least M detection signal quantities corresponding to the M predetermined angles are obtained, respectively, wherein the detection signal quantities are obtained based on the analysis of gamma rays received by the detector, wherein M is an integer greater than or equal to 2; as well as Based on the M detection signal quantities and a preset reference signal quantity, the angular position of the suspected target substance in the detected object is determined.

10. The method according to claim 9, in, The step of determining the angular position of the suspected target substance in the detected object based on the M detection signal quantities and the preset reference signal quantity includes: Obtaining M reference signal quantities corresponding to the M predetermined angles, respectively, wherein the reference signal quantities are obtained in advance based on detection of a comparison object that does not contain the target substance; For each of the M predetermined angles, determine an index parameter value based on the detected signal quantity and the reference signal quantity, where the index parameter value characterizes the ratio of the increment of the detected signal quantity relative to the reference signal quantity to the measurement noise; and Based on the index parameter values of the respective M predetermined angles, determine the angular orientation of the suspected target substance in the item to be detected.

11. The method according to claim 9 or 10, further comprising: Obtain a gamma energy spectrum, where the gamma energy spectrum is analyzed based on gamma rays received by a detector; Based on the gamma energy spectrum, determine the types of target elements contained in the item to be detected, and the types of target elements are used to determine the type of the suspected target substance.

12. The method according to claim 9 or 10, further comprising: Obtain N detected signal quantities corresponding to N predetermined heights respectively, where the N detected signal quantities are obtained by N sub-detectors arranged along the height direction in the detector, and N is an integer greater than or equal to 2; Based on the N detected signal quantities, determine the height position of the suspected target substance in the item to be detected.

13. The method according to claim 9 or 10, wherein Control the rotating member to rotate the item to be detected from an initial angle to at least M predetermined angles in sequence; At least obtaining M detected signal quantities corresponding to the M predetermined angles respectively includes: Obtain an initial detected signal quantity when the item to be detected is at the initial angle; Control the rotating member to rotate the item to be detected 180° from the initial angle, and obtain the detected signal quantity when the item to be detected is at 180°.

14. The method according to claim 9 or 10, wherein Control the rotating member to rotate the item to be detected from an initial angle to at least M predetermined angles in sequence; At least obtaining M detected signal quantities corresponding to the M predetermined angles respectively includes: Control the rotating member to rotate the item to be detected uniformly by 360° from the initial angle, and rotate to a predetermined angle at each predetermined time interval during the rotation of the item to be detected and obtain the detected signal quantity at the corresponding predetermined angle, where M is an integer greater than or equal to 2.

15. The method according to claim 9 or 10, further comprising: Obtain an initial detected signal quantity when the item to be detected is at the initial angle; Based on the initial detected signal quantity and a preset reference signal quantity, determine an initial index parameter value, where the initial index parameter value is used to characterize the probability that the item to be detected contains a target element; Based on the initial index parameter value, determine whether to control the rotation of the item to be detected.

16. The method according to claim 10, further comprising: Based on the index parameter values exceeding a preset threshold among the M index parameter values and preset mass estimation information, determine the content range of the suspected target substance, where the mass estimation information includes the correspondence between the index parameter value and the content range.

17. The method according to claim 11, wherein Determining the types of target substances contained in the item to be detected based on the gamma energy spectrum includes: Based on the characteristic peaks in the gamma energy spectrum, determining the probability of the existence of each target element among multiple target elements; Based on the probability of the existence of each target element, determining the types of target substances contained in the item to be detected.

18. A computer-readable storage medium, applied to an item detection device, the item detection device including a neutron source, a detector, and a rotating component, the computer-readable storage medium storing executable instructions, which when executed by a processor cause the processor to implement the method according to any one of claims 9 to 17.

Images