Neutron generator, element detection method, electronic equipment and storage medium

Abstract

The invention provides a neutron generator, an element detection method, electronic equipment and a storage medium, the neutron generator comprises a target material, the target material is provided with a neutron generation cavity, a particle flow inlet and a neutron outlet, and the particle flow inlet and the neutron outlet are both communicated with the neutron generation cavity; wherein the target material is configured to controllably move to adjust the orientation of the neutron outlet, and the target material is configured to enable the directions of at least two photons emitted from the neutron outlet to be different after being bombarded by the particle flow. The problem of direction information loss caused by an existing flat plate type target material can be solved, the detection accuracy is improved, detection of all positions of the to-be-detected object can be completed at a time after the target material is combined with a detector for use, and the detection workload is reduced.

Description

Technical Field

[0001] The present application relates to the field of detection, and in particular, to a neutron generator, an element detection method, an electronic device and a storage medium. Background Art

[0002] Pulsed neutron detection technology plays a key role in the fields of well logging, natural gas development and application. For example, in the field of well logging, pulsed neutron detection technology can be used to monitor the remaining oil saturation of the reservoir, measure the water saturation under high mineralization conditions, measure the oxygen-activated water flow, etc.; in the field of natural gas development and application, it can measure the gas saturation.

[0003] Pulsed neutron detection technology generally requires the use of a pulsed neutron generator, whose main structure includes a neutron source, a power supply, and a control circuit. The neutron source includes several main parts such as a gas storage chamber, an ionization chamber, an acceleration chamber, and a target material. The structure of the target material in the current mainstream pulsed neutron generator is generally designed to be flat, so that the pulsed neutrons are emitted to the outside of the neutron tube in a roughly flat form, which will result in a lack of information in certain directions during detection. In some cases, for example, in a well logging scenario, when there are petroleum liquid and rock on both sides of the detector, the detector will confuse the information corresponding to the two substances, resulting in an increase in the logging error, and the results will be biased or even wrong. Summary of the invention

[0004] The present application proposes a neutron generator, an element detection method, an electronic device and a storage medium to solve at least one of the above problems.

[0005] According to one aspect of the present application, a neutron generator is proposed, comprising: a target material, wherein the target material has a neutron generating chamber, a particle flow inlet and a neutron outlet, wherein the particle flow inlet and the neutron outlet are both connected to the neutron generating chamber; wherein the target material is configured to be controllably movable to adjust the direction of the neutron outlet and the target material is configured such that after being bombarded by the particle flow, at least two neutrons emitted through the neutron outlet have different directions.

[0006] According to some embodiments, the neutron generating chamber is configured in a regular or irregular shape.

[0007] According to some embodiments, the target material includes a first part and a second part, the first part has a cavity, the second part extends outward along a partial edge of the first part, and the space surrounded by the first part and the second part is the neutron generating cavity.

[0008] According to some embodiments, the neutron generator further includes: a first driving mechanism connected to the target material, wherein the first driving mechanism is used to drive the target material to rotate around its axis to adjust the direction of the neutron outlet.

[0009] According to some embodiments, the neutron generator further includes: a fixing member connected between the target material and the first driving mechanism.

[0010] According to some embodiments, the neutron generator further includes: a second driving mechanism connected to the target, the second driving mechanism being used to drive the target to adjust the angle between the axial direction of the target and a reference direction, thereby adjusting the direction of the neutron outlet.

[0011] According to some embodiments, a position in the neutron generating chamber opposite to the neutron outlet is configured as a curved surface.

[0012] According to some embodiments, the diameter of the particle flow inlet is greater than or equal to the diameter of the particle flow.

[0013] According to one aspect of the present application, a method for detecting an element is provided, the method comprising: emitting neutrons through the neutron generator.

[0014] According to some embodiments, the element detection method also includes: recording the initial position of the neutron outlet, and the first adjustment path of the target material when driven by the first driving mechanism and / or the second adjustment path of the target material when driven by the second driving mechanism; based on the initial position, and the first adjustment path and / or the second adjustment path, obtaining the direction of the neutron outlet of the target material to determine the position information of the element to be measured.

[0015] According to some embodiments, the element detection method further includes: setting a third adjustment path for the orientation of the neutron outlet according to detection requirements; and controlling the first drive mechanism and / or the second drive mechanism to adjust the orientation of the neutron outlet according to the third adjustment path.

[0016] According to some embodiments, the element detection method further includes: collimating the rays by means of a collimator disposed between the position to be detected and the detector.

[0017] According to some embodiments, the element detection method further includes: acquiring energy spectrum data obtained by detector sampling, and obtaining the type of the element according to the energy spectrum data.

[0018] According to some embodiments, obtaining the type of the element according to the energy spectrum data includes: using a preset formula to calculate the linear attenuation constant of the element; and searching a preset table according to the linear attenuation constant to obtain the type of the element.

[0019] According to some embodiments, the preset formula is:

[0020]

[0021] Where n is the number of scattered photons received by the detector, is the differential cross section, E0 is the incident neutron energy, E1 is the outgoing ray energy, θ is the scattering angle, n0 is the number of incident neutrons, dV is the volume where scattering occurs at the test point, dΩ is the solid angle of the detector to the scattering point, and ρ e is the density of the element at the test point, f i( E 0) is the incident attenuation, f s( E 1) is the scattering attenuation, k is the detection efficiency of the detector, μ is the linear attenuation constant of the element, a is the starting point of the incident neutron, r is the ending point of the incident neutron and the starting point of the outgoing ray, b is the ending point of the outgoing ray, I is the number of photons per unit area propagated by the incident photon to the depth x, and μ is the linear attenuation constant of the element.

[0022] According to one aspect of the present application, an electronic device is provided, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the element detection method as described above.

[0023] According to one aspect of the present application, an element detection device is provided, and the element detection device includes the neutron generator described above.

[0024] According to some embodiments, the element detection device further comprises:

[0025] A detector and a collimator, wherein the collimator is located between the object to be detected and the detector.

[0026] According to one aspect of the present application, a storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor implements the element detection method as described above.

[0027] According to some example embodiments of the present application, unlike traditional neutron generators, the neutron generator provided by the present application, firstly, can make up for the problem of missing directional information caused by existing flat-plate targets and improve detection accuracy by configuring the target material so that at least two photons emitted through the neutron outlet after being bombarded by the particle flow have different directions; secondly, neutrons can be collimated by adjusting the setting of the neutron outlet, which can further improve detection accuracy; thirdly, by adjusting the direction of the neutron outlet, it can complete the detection of all positions of the object to be detected at one time when used in conjunction with a detector, thereby reducing the detection workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present application will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same reference numerals represent the same structure, wherein:

[0029] Figure 1 A structural diagram showing a target material of a neutron generator according to an exemplary embodiment of the present application;

[0030] Figure 2 A structural diagram showing a target material of another neutron generator according to an exemplary embodiment of the present application;

[0031] Figure 3 A structural diagram showing a target material of another neutron generator according to an exemplary embodiment of the present application;

[0032] Figure 4 A structural diagram of a neutron generator according to an exemplary embodiment of the present application is shown;

[0033] Figure 5 A flowchart showing a method for detecting an element according to an exemplary embodiment of the present application is shown;

[0034] Figure 6 A flowchart showing another element detection method according to an exemplary embodiment of the present application;

[0035] Figure 7 A flowchart showing another element detection method according to an exemplary embodiment of the present application;

[0036] Figure 8 A flowchart showing another element detection method according to an exemplary embodiment of the present application;

[0037] Fig. 9 A schematic structural diagram of an element detection device according to an exemplary embodiment of the present application is shown;

[0038] Fig.10 An electronic device according to an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on another element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes. The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that, without one or more of these specific details, the technical solution of the present application may also be implemented, or the technical solution of the present application may be implemented in other ways, components, materials, devices or operations. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0041] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0042] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The term "and / or" or "and / or" includes any and all combinations of one or more related listed items.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0044] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0045] As described in the above background technology, the existing pulsed neutron generator may lose some azimuth data during detection due to unreasonable structural design, thus causing inaccurate detection results.

[0046] In order to solve the technical problems raised by the background technology, the present application provides a neutron generator, an element detection method, an element detection device, an electronic device and a storage medium.

[0047] like Figure 1 As shown, according to one embodiment of the present application, a neutron generator is provided. The neutron generator generally includes a target material 10, and the target material 10 has a neutron generating chamber 11, a particle flow inlet 12 and a neutron outlet 13, and the particle flow inlet 12 and the neutron outlet 13 are both connected to the neutron generating chamber 11. The target material 10 is configured to be controllably movable to adjust the direction of the neutron outlet 13, and the target material 10 is configured to be bombarded by the particle flow so that at least two neutrons emitted through the neutron outlet 13 have different directions, and the direction of the neutron outlet 13 can be adjusted in any direction, including adjustment at various angles such as front and back, left and right, and up and down.

[0048] The present application does not limit the shape of the target 10, such as a sphere, a hemisphere, a cylinder, a square cylinder, a cone, etc. It only requires that it has a neutron generating chamber 11, a particle flow inlet 12, and a neutron outlet 13. In fact, that is to say, the target 10 has at least one accommodating space, such as an inwardly concave structure. As for the depth and width of the concave, the present application does not limit it. In addition, the particle flow inlet 12 can be the open mouth of the neutron generating chamber 11, and the neutron outlet 13 can be a mouth opened on the target 10.

[0049] However, it should be noted that those skilled in the art should understand that the neutron generating chamber 11 should have a wall surface, and of course, in some cases, a bottom surface, and the wall surface and the bottom surface may have a smooth transition or may have some angle relationship, requiring that the angles of neutrons emitted by the wall surface and the bottom surface are different. The wall surface and the bottom surface are both used to receive the bombardment of the particle flow, and neutrons are generated after the bombardment of the particle flow. The neutrons are scattered after being incident on the object to be detected, and the scattered photons are detected by the detector.

[0050] The neutron outlet 13 can be set as needed to achieve the purpose of collimating the neutron emission direction. For example, when the neutron is required to be emitted in a generally horizontal direction, the neutron outlet 13 is set so that its axis is parallel to the horizontal direction. Further, the size, position, shape, etc. of the neutron outlet 13 can be set according to the characteristics of the object to be measured. For example, according to the characteristics of the object to be measured, the neutron outlet 13 is set to a circle with a diameter of 2 cm, and its axis is parallel to the horizontal direction, so as to complete the detection of most of the positions of the object to be measured. Then, during operation, the direction of the neutron outlet 13 is adjusted by controlling the movement of the target material 10 to achieve the detection of the remaining positions of the object to be measured. In this way, the detection of the object to be measured can be completed through one operation, and the position adjustment of the target material 10 is reduced.

[0051] The number of neutron outlets 13 can also be set as needed, and can be one or more. When there are more than one neutron outlets 13, they can be numbered to facilitate tracing the scattered photons, so as to accurately find the scattering position. Of course, when there are more than one neutron outlets 13, the positional relationship and size relationship between the multiple neutron outlets 13 can also be set as needed, and can be evenly spaced, unevenly or irregularly spaced, side by side, or staggered, and can be the same or different in size, or can be arranged in a certain size pattern. Similarly, the shapes of the multiple neutron outlets 13 can also be the same or different.

[0052] Regarding how to make the target material 10 move in a controlled manner, the target material 10 can be driven by some driving mechanisms and control programs. Of course, in some cases, the movement of the target material 10 can also be manually controlled. The core requirement is that the target material 10 is not completely fixed in the neutron generator, but can be moved under the action of some external forces, so that the direction of the neutron outlet 13 can be adjusted to complete the detection of various positions of the object to be tested.

[0053] Regarding the configuration of the target material 10 so that after being bombarded by the particle flow, at least two photons emitted through the neutron outlet 13 have different directions, this can be achieved by setting the neutron generating chamber 11 to a curved surface or a surface with different concave and convex shapes. Specifically, in an example of the present application, the position of the neutron generating chamber 11 opposite to the neutron outlet 13 is configured as a curved surface, and the present application does not make any requirements on the curvature of the curved surface, as long as the angles of the emitted neutrons are different.

[0054] Different from the traditional neutron generator, the neutron generator provided in the present application, firstly, can make up for the problem of missing directional information caused by the existing flat target 10 and improve the detection accuracy by configuring the target 10 so that at least two photons emitted through the neutron outlet 13 have different directions after being bombarded by the particle flow; secondly, the neutrons can be collimated by adjusting the neutron outlet 13, which can further improve the detection accuracy; thirdly, by adjusting the direction of the neutron outlet 13, it can complete the detection of all positions of the object to be detected at one time when used in conjunction with the detector, thereby reducing the detection workload.

[0055] In an example of the present application, the neutron generating chamber 11 is configured in a regular or irregular shape.

[0056] For example, the neutron generating chamber 11 may be spherical. Figure 1 As shown, the top opening of the neutron generating chamber 11 forms a particle flow inlet 12, and the neutron outlet 13 can be at any position of the sphere.

[0057] For another example, the neutron generating chamber 11 may be bowl-shaped. Figure 2As shown, the opening of the bowl-shaped structure is the particle flow inlet 12 , and the neutron outlet 13 can be at any position of the target material 10 .

[0058] Those skilled in the art will appreciate that the shape of the target material 10 may be substantially consistent with or different from the shape of the neutron generating chamber 11 , but preferably they are substantially consistent to facilitate production.

[0059] like Figure 3 As shown, in one example of the present application, the target material 10 includes a first part 14 and a second part 15, the first part 14 has a cavity, the second part 15 extends outward along a portion of the edge of the first part 14, and the space surrounded by the first part 14 and the second part 15 is the neutron generating cavity 11. The neutron outlet 13 can be opened in the first part 14 or in the second part 15, as long as it does not affect the neutron emission and meets the requirements for the neutron outlet 13 in the above other examples.

[0060] The first portion 14 may be a bowl-shaped structure, and the second portion 15 extends outward along the edge of the bowl-shaped structure. Preferably, the neutron outlet 13 is opened on the first portion 14 and is opposite to the second portion 15 .

[0061] like Figure 4 As shown, in one example of the present application, the neutron generator further includes a first driving mechanism 30 connected to the target 10 , and the first driving mechanism 30 is used to drive the target 10 to rotate around its axis to adjust the direction of the neutron outlet 13 .

[0062] In a further example, the speed of the first drive motor can be any value between 1 and 1000 r / min, and the specific value can be determined according to actual needs. During operation, the direction of neutron emission through the object to be tested can be determined by recording the initial position of the neutron outlet 13, the speed of the first drive mechanism 30, and the working time, so as to determine the position of the element to be tested in the substance to be tested.

[0063] The first driving mechanism 30 may be a driving motor, or other mechanisms that can drive the target 10 .

[0064] Continue to see Figure 4 In an example of the present application, the neutron generator also includes a fixing member 20 connected between the target material 10 and the first driving mechanism 30. The fixing member 20 connects the target material 10 to the first driving mechanism 30 on the one hand, and fixes the target material 10 on the other hand to avoid unnecessary shaking.

[0065] In one example of the present application, the neutron generator also includes a second drive mechanism connected to the target material 10. It should be particularly noted here that the second drive mechanism and the target material 10 can be directly connected or indirectly connected. The second drive mechanism is used to drive the target material 10 to adjust the angle between the axial direction of the target material 10 and the reference direction, thereby adjusting the direction of the neutron outlet 13. Regarding the "reference direction", it can be a vertical direction or a horizontal direction, but in actual application, only one certain direction is selected as the reference direction. The neutrons generated by a traditional neutron generator are generally perpendicular to the plane where the object to be measured is located, resulting in a limited detection position. The present application uses a second drive mechanism to make the angle between the neutron and the plane where the object to be measured is located either an acute angle or an obtuse angle, thereby widening the detection range and reducing the number of adjustments to the position of the neutron generator.

[0066] It should be noted that, in order for the particle flow to smoothly enter the neutron generating chamber 11, the diameter of the particle flow inlet 12 is required to be greater than or equal to the diameter of the particle flow. Furthermore, the shape of the particle flow inlet 12 can be compatible with the particle flow.

[0067] Corresponding to the above-mentioned neutron generator, the present application also provides an element detection method. In an example of the present application, the element detection method emits neutrons through the neutron generator provided in any of the above examples. The existing common element detection methods generally use X-rays as the photon source. Compared with the scheme of using X-rays as the photon source, the present application uses neutrons as the photon source. Since the energy of neutrons is greater than that of X-rays, they can trigger nuclear reactions and generate gamma photons for imaging. On the basis of X-rays, the types of element detection can be increased, for example, elements such as C, H, O, Si, Ga, and Fe can be detected.

[0068] Furthermore, by adopting this element detection method, since the target material 10 is configured to be bombarded by the particle flow so that the directions of at least two photons emitted through the neutron outlet 13 are different, the problem of missing directional information caused by the existing flat target material 10 can be compensated, and the detection accuracy can be improved; by adjusting the setting of the neutron outlet 13, the neutrons can be collimated, which can further improve the detection accuracy; and further, by adjusting the direction of the neutron outlet 13, the detection of all positions of the object to be detected can be completed at one time, reducing the detection workload.

[0069] like Figure 5 As shown, in one example of the present application, the element detection method further includes:

[0070] S110: recording an initial position of the neutron outlet and a first adjustment path of the target driven by the first driving mechanism;

[0071] S120: Obtaining the direction of the neutron outlet of the target material according to the initial position and the first adjustment path to determine the position information of the element to be measured.

[0072] The first adjustment path can be obtained through the rotation speed and working time of the first driving mechanism. According to the above example of the neutron generator, the first driving mechanism is used to drive the target to rotate around its axis to adjust the direction of the neutron outlet.

[0073] It can be understood that when performing element detection, the neutron generator is bombarded by the particle flow to generate neutrons, and the neutrons are incident on the object to be detected. In this process, the target rotates as required by the driving of the first driving mechanism, causing the incident position of the neutrons on the object to be detected to continuously change. When the neutrons collide with specific elements in the object to be detected, they will be attenuated and scattered, and the scattered photons will be emitted from the object to be detected and captured by the detector. Figure 5 The method shown can obtain the position where the scattering occurs, that is, the position of the specific element in the object to be measured.

[0074] It should be noted that when the number of neutron outlets is greater than one, for the recording of the initial position, in order to simplify the process, the relative position relationship between the multiple neutron outlets can be obtained in advance, and during detection, the position corresponding to one of the neutron outlets is used as the initial position. Of course, those skilled in the art can understand that each neutron outlet can also be numbered, the numbers can be matched with their respective initial positions, and then the initial positions can be recorded one by one, and the position of the element in the object to be detected can be determined according to subsequent steps.

[0075] like Figure 6 As shown, in one example of the present application, the element detection method further includes:

[0076] S210: Recording the initial position of the neutron outlet and the second adjustment path of the target driven by the second driving mechanism;

[0077] S220: Obtain the direction of the neutron outlet of the target material according to the initial position and the second adjustment path to determine the position information of the element to be measured.

[0078] The second adjustment path can be obtained based on prior knowledge or by monitoring the second drive mechanism. According to the above example of the neutron generator, the second drive mechanism is used to drive the target to adjust the angle between the axial direction of the target and the reference direction.

[0079] like Figure 7 As shown, in one example of the present application, the element detection method further includes:

[0080] S310: Recording the initial position of the neutron outlet, the first adjustment path of the target under the first driving mechanism, and the second adjustment path of the target under the driving of the second driving mechanism;

[0081] S320: Obtain the direction of the neutron outlet of the target material according to the initial position, the first adjustment path and the second adjustment path to determine the position information of the element to be measured.

[0082] and Figure 5 and Figure 6 Compared with the method shown, Figure 7 The method shown in the figure, because two driving mechanisms are used, according to the above-mentioned examples of the neutron generator, it can be known that the object to be detected can be detected more comprehensively, that is, Figure 7 The position information of the element to be measured obtained by the method shown is more comprehensive and accurate.

[0083] It should be noted that the scattered photon information detected by the detector includes some energy spectrum information and sampling time information related to various elements. When determining the position information of an element, the sampling time and the above information are combined. Figure 5 to Figure 7 The various information mentioned in can trace the location of the element, so as to determine the location of the element in the object to be tested, and then the type of the element can be obtained according to the energy spectrum information and related data processing steps.

[0084] like Figure 8 As shown, in one example of the present application, the element detection method further includes:

[0085] S410: setting a third adjustment path of the direction of the neutron outlet according to the detection requirement;

[0086] S420: Control the first driving mechanism and / or the second driving mechanism to adjust the direction of the neutron outlet according to the third adjustment path.

[0087] The detection requirements may be set based on information of the object to be detected and predicted information of the object to be detected.

[0088] The third adjustment path can be disassembled into a first adjustment path for controlling the first driving mechanism and a second adjustment path for controlling the second driving mechanism.

[0089] Furthermore, in the present application, in order to obtain more accurate element detection information, the element detection method further includes: collimating the rays by means of a collimator disposed between the position to be detected and the detector.

[0090] After the neutron generator with collimation function emits neutrons, the neutrons are emitted in a predetermined direction to react with the object to be measured to generate gamma rays, which can be understood in a similar way to the scattered photons mentioned in this application. Gamma rays are an example of scattered photons in the method of this application. Gamma rays are emitted in all directions, some of which are detected by the detector. The collimator at the front end of the detector also has a collimation function, so the detector can accurately obtain the position of the gamma ray emission, and the imaging is more accurate.

[0091] According to an example of the present application, in order to obtain the element type, the element detection method further includes:

[0092] The energy spectrum data obtained by the detector sampling is obtained, and the type of element is obtained according to the energy spectrum data.

[0093] It should be noted that the method of detecting elements in the substance to be tested by neutrons in this application complies with the Compton imaging principle, which can be expressed by Klein-Nishina:

[0094]

[0095] Among them, r e and α are known numbers, dσ ( θ ) It is the probability that a scattered photon is emitted within the solid angle dΩ of the scattering angle θ, E0 is the incident neutron energy, and E1 is the outgoing ray energy.

[0096] According to an example of the present application, obtaining the type of element according to the energy spectrum data includes:

[0097] The linear attenuation constant of the element is calculated using a preset formula;

[0098] The type of element is obtained by searching the preset table according to the linear attenuation constant.

[0099] The preset table may be a comparison table of linear attenuation constants and element types.

[0100] According to the above Compton scattering principle, the preset formula can be obtained as follows:

[0101]

[0102] Where n is the number of scattered photons received by the detector, is the differential cross section, E0 is the incident neutron energy, E1 is the outgoing ray energy, θ is the scattering angle, n0 is the number of incident neutrons, dV is the volume where scattering occurs at the test point, dΩ is the solid angle of the detector to the scattering point, and ρ e is the density of the element at the test point, f i( E0) is the incident attenuation, f s( E 1) is the scattering attenuation, k is the detection efficiency of the detector, μ is the linear attenuation constant of the element, a is the starting point of the incident neutron, r is the ending point of the incident neutron and the starting point of the outgoing ray, b is the ending point of the outgoing ray, I is the number of photons per unit area propagated by the incident photon to the depth x, and μ is the linear attenuation constant of the element.

[0103] In the preset formula, n, n0, dV, dΩ, and k are all known numbers. If attenuation is ignored, ρ can be obtained: e All scattering points in the object to be measured are calculated by the above preset formula, and finally the electron density of all scattering points in the object to be measured can be obtained, and imaging can be performed using the electron density.

[0104] Due to a, b, r, I, f i( E 0) and f s( E 1) are all known numbers, so the linear attenuation constant can also be obtained through the above preset formula. Then, the type of the element to be measured can be obtained by looking up the comparison table of linear attenuation constant and element type.

[0105] Corresponding to the above-mentioned neutron generator, the present application also provides an element detection device, which includes the above-mentioned neutron generator. It can be understood that the element detection device can achieve the technical effect that the above-mentioned neutron generator can achieve.

[0106] like Fig. 9 As shown, according to an example of the present application, the element detection device also includes a detector 200 and a collimator 300, and the collimator 300 is located between the object to be detected 400 and the detector 200. After the neutron generator 100 with a collimation function emits neutrons, the neutrons are emitted in a predetermined direction to react with the object to be detected 400 to generate gamma rays. Gamma rays are emitted in various directions, a portion of which is detected by the detector 200. The collimator 300 at the front end of the detector 200 also has a collimation function, so the detector 200 can accurately obtain the position of the gamma ray emission, and the imaging is more accurate. Fig. 9 In FIG. 1 , the straight line connecting the neutron generator 100 and the object to be measured 400 represents neutrons, and the straight line connecting the object to be measured 400 and the collimator 300 represents scattered photons. In addition, it should be particularly noted that: Fig. 9 The object to be detected 400 is only an example. Usually in actual detection, the object to be detected may not refer to a specific object, but some environments, such as the downhole environment in oil well logging.

[0107] Corresponding to the above-mentioned element detection method, the present application also provides an electronic device.

[0108] Fig.10 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0109] like Fig.10 As shown, the electronic device is in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: at least one processor 910, at least one memory 920, a bus 930 connecting different system components (including the memory 920 and the processor 910), a display unit 940, etc. Among them, the memory 920 stores program code, and the program code can be executed by the processor 910, so that the processor 910 executes the method described in this specification according to various exemplary embodiments of the present application. For example, the processor 910 can execute as follows Figures 5 to 8 The method shown in .

[0110] The memory 920 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 9201 and / or a cache memory unit 9202 , and may further include a read-only memory unit (ROM) 9203 .

[0111] The memory 920 may also include a program / utility 9204 having a set (at least one) of program modules 9205, such program modules 9205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0112] Bus 930 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0113] The electronic device may also communicate with one or more external devices 900 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may communicate with one or more devices that enable a user to interact with the electronic device, and / or may communicate with any device that enables the electronic device to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 950. Furthermore, the electronic device may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 960. The network adapter 960 may communicate with other modules of the electronic device via a bus 930. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0114] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. The technical solution according to the implementation method of the present application can be embodied in the form of a software product, which can be stored in a computer-readable storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including a number of computer program instructions to enable a computing device (which can be a personal computer, a server, or a network device, etc.) to execute the above method according to the implementation method of the present application.

[0115] The software product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0116] Computer readable storage media may include data signals propagated in baseband or as part of a carrier wave, wherein readable program codes are carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program codes contained on the readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0117] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0118] The computer-readable medium carries one or more program instructions. When the one or more program instructions are executed by a device, the computer-readable medium implements the aforementioned functions.

[0119] Those skilled in the art will appreciate that the above modules can be distributed in the device according to the description of the embodiment, or can be changed accordingly and only used in one or more devices different from the embodiment. The multiple modules of the above embodiments can be combined into one module, or one module can be further divided into multiple sub-modules.

[0120] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. The technical solution according to the implementation method of the present application can be embodied in the form of a software product, which can be stored in a computer-readable storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including a number of computer program instructions to enable a computing device (which can be a personal computer, a server, or a network device, etc.) to execute the above method according to the implementation method of the present application.

[0121] The software product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0122] Computer readable storage media may include data signals propagated in baseband or as part of a carrier wave, wherein readable program codes are carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program codes contained on the readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0123] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0124] The computer-readable medium carries one or more program instructions. When the one or more program instructions are executed by a device, the computer-readable medium implements the aforementioned functions.

[0125] Those skilled in the art will appreciate that the above modules can be distributed in the device according to the description of the embodiment, or can be changed accordingly and only used in one or more devices different from the embodiment. The multiple modules of the above embodiments can be combined into one module, or one module can be further divided into multiple sub-modules.

[0126] Although the present application provides method operation steps such as the above embodiments or flow charts, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the embodiments of the present application.

[0127] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0128] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A neutron generator, characterized in that: include: A target material, wherein the target material has a neutron generating cavity, a particle flow inlet and a neutron outlet, wherein the particle flow inlet and the neutron outlet are both connected to the neutron generating cavity; The target material is configured to be controllably movable to adjust the direction of the neutron outlet and the target material is configured to be bombarded by the particle flow so that at least two neutrons emitted through the neutron outlet have different directions.

2. The neutron generator according to claim 1, characterized in that: The neutron generating chamber is configured in a regular or irregular shape.

3. The neutron generator according to claim 1, characterized in that: The target material includes a first part and a second part, the first part has a cavity, and the space surrounded by the first part and the second part is the neutron generating cavity.

4. The neutron generator according to claim 1, characterized in that: The neutron generator also includes: The first driving mechanism is connected to the target material, and the first driving mechanism is configured to drive the target material to rotate around its axis to adjust the direction of the neutron outlet.

5. The neutron generator according to claim 4, characterized in that: The neutron generator also includes: A fixing member is connected between the target material and the first driving mechanism.

6. The neutron generator according to claim 4, characterized in that: The neutron generator also includes: The second driving mechanism is connected to the target material, and the second driving mechanism is configured to drive the target material to adjust the angle between the axial direction of the target material and a reference direction, thereby adjusting the direction of the neutron outlet.

7. The neutron generator according to claim 1, characterized in that: The position in the neutron generating chamber opposite to the neutron outlet is configured as a curved surface.

8. The neutron generator according to claim 1, characterized in that: The diameter of the particle flow inlet is greater than or equal to the diameter of the particle flow.

9. A method for detecting an element, characterized in that: The element detection method comprises: Neutrons are emitted by the neutron generator according to any one of claims 1 to 8.

10. The element detection method according to claim 9, characterized in that: The element detection method further comprises: Recording the initial position of the neutron outlet, and a first adjustment path of the target driven by the first driving mechanism and / or a second adjustment path of the target driven by the second driving mechanism; The orientation of the neutron outlet of the target material is obtained according to the initial position and the first adjustment path and / or the second adjustment path, thereby determining the position information of the element to be measured.

11. The element detection method according to claim 9, characterized in that: The element detection method further comprises: A third adjustment path for setting the orientation of the neutron outlet according to detection requirements; The first driving mechanism and / or the second driving mechanism are controlled to adjust the direction of the neutron outlet according to the third adjustment path.

12. The element detection method according to claim 9, characterized in that: The element detection method further comprises: The rays are collimated by a collimator arranged between the position to be detected and the detector.

13. The element detection method according to claim 9, characterized in that: The element detection method further comprises: The energy spectrum data obtained by the detector sampling is acquired, and the type of the element is obtained according to the energy spectrum data.

14. The element detection method according to claim 13, characterized in that: The type of element obtained according to the energy spectrum data includes: The linear attenuation constant of the element is calculated using a preset formula; The type of the element is obtained by searching a preset table according to the linear attenuation constant.

15. The element detection method according to claim 14, characterized in that: The preset formula is: Where n is the number of scattered photons received by the detector, is the differential cross section, E0 is the incident neutron energy, E1 is the outgoing ray energy, θ is the scattering angle, n0 is the number of incident neutrons, dV is the volume where scattering occurs at the test point, dΩ is the solid angle of the detector to the scattering point, and ρ e is the density of the element at the test point, f i( E 0) is the incident attenuation, f s( E1 is the scattering attenuation, k is the detection efficiency of the detector, μ is the linear attenuation constant of the element, a is the starting point of the incident neutron, r is the ending point of the incident neutron and the starting point of the outgoing ray, b is the ending point of the outgoing ray, I is the number of photons per unit area propagated by the incident photon to the depth x, and μ is the linear attenuation constant of the element.

16. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the element detection method according to any one of claims 9 to 15.

17. An element detection device, characterized in that: The element detection device comprises: a neutron generator according to any one of claims 1 to 8.

18. The element detection device according to claim 17, characterized in that The element detection device also includes: A detector and a collimator, wherein the collimator is located between the object to be detected and the detector.

19. A storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the processor is enabled to implement the element detection method according to any one of claims 9 to 15.

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