Device for controlling receiving angle of muon detector

Abstract

The utility model relates to a device for controlling the receiving angle of a muon detector. The device comprises a fixed support, the fixed support comprises a rotating shaft in the horizontal direction, and the muon detector can rotate around the rotating shaft; the muon detector is fixedly arranged on the inner plate, the inner plate can rotate around the rotating shaft, a plurality of inner holes are formed in an arc area on the inner plate, the distances between the inner holes and the rotating shaft are equal, and the included angles between every two adjacent inner holes are equal; the outer plate is fixedly arranged on the fixing support, a plurality of outer through holes are formed in an arc area on the outer plate, the distance between each outer through hole and the rotating shaft is equal, the distance between each outer through hole and the rotating shaft is equal, and the included angle between every two adjacent outer through holes is equal; and the bolt can penetrate through any outer through hole and is inserted into any inner hole, so that the receiving angle of the muon detector is locked. According to the technical scheme of the device for controlling the receiving angle of the muon detector, the receiving angle of the muon detector can be adjusted with higher precision.

Description

Technical Field

[0001] The present application relates to the field of radiation physics and detection, and in particular to a device for controlling the receiving angle of a muon detector. Background Art

[0002] Muon is one of the fundamental particles in nature with extremely strong penetrating power, which can achieve non-contact, deep penetration and non-destructive imaging of large targets.

[0003] In the field of geology, this technology can be used to detect the density distribution of underground structures and rock formations, which is helpful for oil and mineral exploration. In the field of archaeology, muon imaging technology has significant advantages. Traditional detection technology may cause irreversible damage to the appearance of cultural relics and monuments, while muon imaging technology can detect through the appearance of cultural relics, which not only protects the original appearance of cultural relics, but also reveals their internal structure. For example, researchers used muon imaging technology to detect the Pyramid of Khufu in Egypt, successfully inferred the internal structure of the pyramid, and discovered what may be one of the largest cavities to date.

[0004] In the process of muon detection, it is often necessary to adjust the receiving angle of the detector to detect muon flux at different zenith angles. However, the mass of the muon detector is large, and it is difficult to achieve precise angle control. Therefore, in existing muon detectors at home and abroad, the angle is generally adjusted by means of holes and pins (such as Figure 1-Figure 3 ), generally speaking, a single row of holes and a latch can achieve a control accuracy of 10° per level, and a double row of holes and a latch can achieve a control accuracy of 5° per level. For this design, in order to achieve higher-precision angle control, more holes need to be punched, but due to the limited space on the board, the number of holes cannot be too large, so it is difficult to further improve the accuracy.

[0005] In some scenarios, this accuracy can meet the experimental requirements, but for situations where the angle accuracy is higher, this design accuracy cannot meet the requirements. Therefore, it is urgent to design an angle control solution that can achieve higher accuracy without changing the cost. Utility Model Content

[0006] In order to at least partially solve one or more technical problems mentioned in the background technology, the present application provides a technical solution for a device for controlling the receiving angle of a muon detector. By cleverly designing the array of holes, a substantial increase in the number of adjustable receiving angles of the muon detector is achieved.

[0007] The present application provides a device for controlling the receiving angle of a muon detector, characterized in that it includes: a fixed bracket, the fixed bracket includes a horizontal rotating shaft, and the muon detector can rotate around the rotating shaft; an inner plate, the muon detector is fixedly arranged on the inner plate, the inner plate can rotate around the rotating shaft, a plurality of inner holes are arranged in a circular arc area on the inner plate, each inner hole is at an equal distance from the rotating shaft, and the angles between two adjacent inner holes are equal; an outer plate, the outer plate is fixedly arranged on the fixed bracket, a plurality of outer through holes are arranged in a circular arc area on the outer plate, each outer through hole is at an equal distance from the rotating shaft, and is the same as the distance from each inner hole to the rotating shaft, and the angles between two adjacent outer through holes are equal; a pin, which can pass through any outer through hole and be inserted into any inner hole, so that the receiving angle of the muon detector is locked.

[0008] In some embodiments, the inner hole diameter is the same as the outer through hole diameter.

[0009] In some embodiments, the included angle between two adjacent inner holes is different from the included angle between two adjacent outer through holes.

[0010] In some embodiments, the angle between the two inner holes that are farthest apart is 90° to 180°.

[0011] In some embodiments, the angle between the two outer through holes that are farthest apart is 90° to 180°.

[0012] In some embodiments, an arc through groove is provided in another arc region of the outer plate, and the distance between the arc through groove and the rotating shaft is the same as the distance between each inner hole and the rotating shaft.

[0013] In some embodiments, two inner plates, two outer plates, and two latches are respectively located on both sides of the muon detector.

[0014] In some embodiments, when the pin is inserted into the leftmost outer hole and the rightmost inner hole, the muon detector is at the rightmost maximum receiving angle; when the pin is inserted into the rightmost outer hole and the leftmost inner hole, the muon detector is at the leftmost maximum receiving angle.

[0015] In some embodiments, the angle between two adjacent inner holes is 10°, and the angle between two adjacent outer through holes is 9°.

[0016] In some embodiments, the angle between two adjacent inner holes is 9°, and the angle between two adjacent outer through holes is 10°.

[0017] Through the technical solution of the device for controlling the receiving angle of the muon detector of the present application, by designing a combination of several fixed rows of holes and several rotatable rows of holes, it is possible to achieve higher-precision adjustment of the receiving angle of the muon detector compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 A schematic diagram showing an inner plate of a muon detector receiving angle adjustment template in the prior art;

[0020] Figure 2 A schematic diagram showing an outer plate of a muon detector receiving angle adjustment template in the prior art;

[0021] Figure 3 A schematic diagram showing that the receiving angle of a muon detector in the prior art is fixed by a latch;

[0022] Figure 4 A front view of a device for controlling the receiving angle of a muon detector according to an embodiment of the present application is shown;

[0023] Figure 5 A left view of a device for controlling the receiving angle of a muon detector according to an embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram showing an inner panel according to an embodiment of the present application;

[0025] Figure 7 A schematic diagram showing an outer panel according to an embodiment of the present application;

[0026] Figure 8 A schematic diagram showing an inner panel according to another embodiment of the present application;

[0027] Fig. 9 A schematic diagram showing an outer panel according to another embodiment of the present application;

[0028] Fig.10 A perspective view showing an inner panel according to yet another embodiment of the present application;

[0029] Fig.11 A schematic diagram showing the processing of an inner panel according to another embodiment of the present application is shown;

[0030] Fig.12 A perspective view showing an outer panel according to yet another embodiment of the present application;

[0031] Fig.13 A schematic diagram showing the processing of an outer panel according to another embodiment of the present application is shown;

[0032] Fig.14 A schematic diagram showing a number of an outer panel according to another embodiment of the present application;

[0033] Fig.15 A schematic diagram showing a number of an inner panel according to another embodiment of the present application;

[0034] Fig.16 A schematic diagram showing a reading bar of an outer plate arc slot according to another embodiment of the present application;

[0035] Fig.17 A schematic diagram showing arc slot hole readings according to yet another embodiment of the present application is shown. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] It should be understood that the terms "first", "second", "third", and "fourth" in the claims, specification, and drawings of the present application are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specification and claims of the present application indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their collections.

[0038] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this application specification and claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms. It should also be further understood that the term "and / or" used in this application specification and claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0039] As used in this specification and claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0040] The specific implementation of the present application is described in detail below with reference to the accompanying drawings.

[0041] The purpose of this application is to provide a device for controlling the receiving angle of a muon detector, which greatly improves the control accuracy of the receiving angle of the muon detector while ensuring that the cost remains basically unchanged.

[0042] Figure 4 and Figure 5 The overall structure of the device for controlling the receiving angle of the muon detector according to an embodiment of the present application is shown.

[0043] The device for controlling the receiving angle of the muon detector includes a fixed bracket 20, and the fixed bracket 20 includes a horizontal rotation axis 30, and the muon detector 10 can rotate around the rotation axis 30. Figure 5 The rotating shaft 30 is shown as a long axis, but those skilled in the art will understand that the rotating shaft 30 is only a schematic representation of the rotation around which the muon detector 10 can rotate. It can be a virtual rotating shaft, or only exists at the front and rear ends of the fixed bracket 20 to support both sides of the muon detector 10.

[0044] The device for controlling the receiving angle of the muon detector includes an inner plate 40 , on which the muon detector 10 is fixedly arranged, and the inner plate 40 can rotate around the rotating shaft 30 .

[0045] The device for controlling the receiving angle of the muon detector includes an outer plate, which is fixed on the fixing bracket 20 .

[0046] Fig.10 A three-dimensional diagram of the inner plate 40 according to an embodiment of the present application is shown. A plurality of inner holes are arranged in an arc region on the inner plate 40, each inner hole is at an equal distance from the rotating shaft 30, and the angles between two adjacent inner holes are equal.

[0047] Although the inner plate 40 is shown as a circle, those skilled in the art will appreciate that the inner plate can be in any shape, such as a polygon, a ring, etc. Figure 5 FIG. 4 shows that the inner plate 40 is fixedly connected to the muon detector 10 , but those skilled in the art will appreciate that the inner plate may be integrated as a part of the muon detector 10 , such as a part of the outer shell thereof.

[0048] Similarly, Figure 4 and Figure 5 The outer plate is not particularly shown in the figure, and those skilled in the art will appreciate that the outer plate may be circular or in any shape, such as a polygon, a sector, etc. The outer plate may be fixedly connected to the fixing bracket 20 or may be integrated as a part of the fixing bracket 20.

[0049] A plurality of external through holes are arranged in an arc region of the outer plate, each of which is equidistant from the rotation axis 30, and the angles between two adjacent external through holes are equal. The distance between each external through hole and the rotation axis 30 is the same as the distance between each inner hole and the rotation axis 30.

[0050] The device for controlling the receiving angle of the muon detector includes a pin, which can pass through any outer through hole and be inserted into any inner hole, so that the receiving angle of the muon detector 10 is locked.

[0051] Generally speaking, the inner hole diameter is the same as the outer hole diameter, and both are equal to the outer diameter of the plug, so that the receiving angle of the muon detector 10 can be stabilized when the plug is inserted into the outer hole and the inner hole. Those skilled in the art can understand that the inner hole and / or the outer hole are not necessarily circular, and similarly, the cross section of the plug is not necessarily circular. As long as the insertion of the plug can lock the inner plate 40 in the rotation direction when the inner hole overlaps the outer hole, the inner hole diameter can be regarded as the same as the outer hole diameter.

[0052] Preferably, the angle between two adjacent inner holes is different from the angle between two adjacent outer through holes, so that different receiving angles are achieved through the angle differences and misalignments between the different inner holes and the outer through holes.

[0053] Based on the common requirements for the adjustment range of the receiving angle of the muon detector 10, the angle range between the two inner holes that are farthest apart can be set to 90° to 180°, and in special cases it can be smaller than 90° or larger than 180°. Similarly, the angle range between the two outer through holes that are farthest apart can be set to 90° to 180°, and in special cases it can be smaller than 90° or larger than 180°. Those skilled in the art will understand that the angle between the two inner holes that are farthest apart can be the same as or different from the angle between the two outer through holes that are farthest apart.

[0054] Preferably, an arc through groove may be provided in another arc region of the outer plate without an outer through hole, such as Fig.16 As shown, the distance between the arc through groove and the rotating axis is the same as the distance between each inner hole and the rotating axis.

[0055] like Figure 5 As shown, the device for controlling the receiving angle of the muon detector preferably includes two inner plates 40, two outer plates, and two pins, which are respectively located on both sides of the muon detector 10. This can make the adjustment of the receiving angle of the muon detector 10 more stable. However, in the case of limited costs or sufficient single-sided stability, a single-sided setting is also feasible.

[0056] When the pin is inserted into the leftmost outer hole and the rightmost inner hole, the muon detector 10 is at the rightmost maximum receiving angle; when the pin is inserted into the rightmost outer hole and the leftmost inner hole, the muon detector 10 is at the leftmost maximum receiving angle. The left and right mentioned in this article refer to relative position concepts, which are only for the convenience of description and are not absolute. For example, when facing Figure 4In the front view shown, if the outer through hole and the inner hole are both located below the rotation axis 30, it is one orientation, and if the outer through hole and the inner hole are both located above the rotation axis 30, it is the opposite orientation. Similarly, if it is set on both sides, it will also be the opposite orientation when facing the rear view. In the actual measurement process, it will be converted into the zenith angle for calibration.

[0057] Preferably, the angle between two adjacent inner holes is 10°, and the angle between two adjacent outer holes is 9°. The inner and outer holes can also be exchanged, that is, the angle between two adjacent inner holes is 9°, and the angle between two adjacent outer holes is 10°.

[0058] In a specific embodiment, the inner holes are arranged on the inner plate at intervals of 15°, and a total of 7 are arranged, that is, all the inner holes cover a range of 90°, such as Figure 6 As shown, the inner holes are numbered i1, i2, ..., i7. The outer through holes are arranged on the outer plate at intervals of 18°, and a total of 6 are arranged, that is, all the outer through holes cover a range of 90°, as shown in FIG. Figure 7 As shown, the external through holes are numbered e1, e2...e6 in sequence. When the leftmost outer through hole is aligned with the leftmost inner hole, or when the rightmost outer through hole is aligned with the rightmost inner hole, the receiving angle of the muon detector can be calibrated to 0° for example. Those skilled in the art will understand that the present application does not impose any limitation on the angle calibration method, and the calibration can be performed in any manner, and is intended to describe the convenience of the angle adjustment scheme. The insertion of the pin into different outer through holes and inner holes corresponds to different receiving angles, which can be calculated, obtained by looking up a table, or directly read by installing a protractor on the bracket.

[0059] If calculation or table lookup is used, the external through hole numbers can be seen directly, but the internal hole numbers can be read through the arc barrel groove set on the outer plate, or through the extended mark corresponding to each internal hole on the inner plate (exposed from the outer plate). It can be understood by those skilled in the art that the numbering method can be optional as long as the corresponding hole can be identified.

[0060] Table 1

[0061]

[0062] If only 7 holes are set within the range of 90° according to the prior art, only a 90° receiving angle range can be achieved, and only 7 angles can be adjusted with an accuracy of 15°. In this embodiment, a ±90° receiving angle range is achieved, that is, a 180° receiving angle range. A total of 41 angles can be adjusted. Among them, within the ±30° receiving angle range, an adjustment accuracy of 3° is achieved.

[0063] Those skilled in the art will appreciate that, alternatively, the inner holes may be arranged at intervals of 18° on the inner plate, and the outer holes may be arranged at intervals of 15° on the outer plate. In addition, the arc range covered by all the inner holes may be different from the arc range covered by all the outer holes, for example, all the inner holes cover 90°, and all the outer holes cover 180°, then a receiving angle range of 270° may be achieved.

[0064] There is a lower limit to the angle between adjacent holes, so it is difficult to achieve lower precision through a single row of holes, and there is also a lower limit to the distance between the hole and the rotating shaft, so the prior art uses a double row of holes at most to double the precision. The reason is that, due to cost and controllability considerations, it is impossible to design the inner or outer plate to exceed the size of the muon detector, so the diameter of the inner or outer plate generally does not exceed 40cm. The muon detector is heavy, and the diameter of the pin cannot be too small, otherwise it may break. The distance between the hole and the rotating shaft cannot be too small, otherwise it will significantly increase the force on the pin. In addition, the distance between the holes cannot be too small. For example, assuming that the distance between the hole and the rotating shaft is 30cm, the hole diameter is at least 2cm, and the hole spacing is at least 3cm, then the angle between adjacent holes is at least (2+3)*180° / (π*30)=9.6°.

[0065] In another specific embodiment, inner holes are arranged on the inner plate at intervals of 10°, and a total of 19 inner holes are arranged, that is, all inner holes cover a range of 180°, such as Figure 8 As shown, the inner holes are numbered i1, i2, ..., i19 in sequence. The outer through holes are arranged on the outer plate at 9° intervals, and a total of 21 are arranged, that is, all the outer through holes cover a range of 180°, as shown in FIG. Fig. 9 As shown, the external through holes are numbered e1, e2...e21 in sequence. When the leftmost outer through hole is aligned with the leftmost inner hole, or when the rightmost outer through hole is aligned with the rightmost inner hole, the receiving angle of the muon detector can be calibrated to 0° for example. Those skilled in the art will understand that the present application does not impose any limitation on the angle calibration method, and the calibration can be performed in any manner, and is intended to describe the convenience of the angle adjustment scheme. The insertion of the pin into different external through holes and inner holes corresponds to different receiving angles, which can be calculated, obtained by looking up a table, or directly read by installing a protractor on the bracket.

[0066] If calculation or table lookup is used, the external through hole numbers can be seen directly, but the internal hole numbers can be read through the arc barrel groove set on the outer plate, or through the extended mark corresponding to each internal hole on the inner plate (exposed from the outer plate). It can be understood by those skilled in the art that the numbering method can be optional as long as the corresponding hole can be identified.

[0067] Table 2

[0068]

[0069]

[0070] If only 21 holes are set within the range of 180° according to the prior art, only a receiving angle range of 180° can be achieved, and only 21 angles can be adjusted with an accuracy of 9°. In this embodiment, a receiving angle range of ±180° is achieved, that is, a receiving angle range of 360°. A total of more than 200 angles can be adjusted. Among them, within the receiving angle range of ±108°, an adjustment accuracy of 1° is achieved.

[0071] Those skilled in the art will appreciate that, alternatively, the inner holes may be arranged on the inner plate at intervals of 9°, and the outer through holes may be arranged on the outer plate at intervals of 10°.

[0072] This embodiment improves the angle control accuracy to 1°, which can meet the detection requirements of the muon imaging system in most cases. The basic principles of this embodiment are as follows:

[0073] First, the inner plate is perforated. In this embodiment, the inner hole is perforated below the shaft. Those skilled in the art will appreciate that the inner hole can also be located above the shaft or in any continuous arc area on the inner plate. Divide the 180° angle into 18 equal parts and perforate 19 inner holes. The difference between any two adjacent inner holes is 10°. Figure 10-11 .

[0074] Secondly, punch holes in the outer plate, divide the 180° angle into 20 equal parts, and punch 20 outer holes (skip the middle outer hole). The difference between each two adjacent outer holes is 9° (except the two middle outer holes). Figure 12-13 The reason why a hole can be omitted in the middle is that, as can be seen from Table 2, the angles corresponding to e11 can be achieved by other combinations, so e11 can be omitted. Similarly, i10, e1, e21, i1, or i19 can be omitted.

[0075] Under this design, the spacing between adjacent inner holes of the inner plate is 10°, and the spacing between adjacent outer holes of the outer plate is 9°. Since the difference between 10° and 9° is 1°, an angle control accuracy of 1° can be achieved. The specific control principle is as follows:

[0076] Number the holes of the outer plate as follows Fig.14 , the first 10 holes from left to right are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and the first 10 holes from right to left are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 (as mentioned above, the numbering is arbitrary and is intended to describe the principle). When the hole 0 on the left side of the outer plate is aligned with the inner plate (such as Fig.15), the detection angle is 0° (as mentioned above, the angle calibration method is arbitrary and is intended to describe the principle). At this time, there is a difference of 1° between hole No. 1 on the left side of the outer plate and hole b on the inner plate. When the inner plate rotates clockwise, hole No. 1 on the left side of the outer plate is aligned with hole b on the inner plate, the detection angle is 1°, when hole No. 2 on the left side of the outer plate is aligned with hole c on the inner plate, the detection angle is 2°, …, when hole No. 9 on the left side of the outer plate is aligned with hole j on the inner plate, the detection angle is 9°, the inner plate continues to rotate clockwise, when hole No. 0 on the left side of the outer plate is aligned with hole b on the inner plate, the detection angle is 10°, when hole No. 1 on the left side of the outer plate is aligned with hole c on the inner plate, the detection angle is 11°, when hole No. 2 on the left side of the outer plate is aligned with hole d on the inner plate, the detection angle is 12°, and so on. The detection angle can be adjusted from 0° to 90° with a control accuracy of 1°. When the inner plate rotates counterclockwise, the detection angle can be changed from 0° to -90°. The principle is the same as that of clockwise rotation and will not be elaborated here.

[0077] In a preferred embodiment, in order to facilitate reading, a reading bar is provided at the same time, and a circular arc slot is opened on the outer plate, such as Fig.16 The reading principle is as follows: first observe the number of complete circular holes exposed in the reading bar, which is the tens digit of the detection angle. Then observe which hole on the outer plate is aligned with a hole on the inner plate. The number of the outer plate hole is the ones digit of the detection angle, for example Fig.17 In the reading bar, 4 complete circular holes are exposed, and the No. 5 hole of the outer plate is aligned with the corresponding hole of the inner plate, so the detection angle is 45°. After determining the detection angle, insert the pin into the aligned holes to achieve long-term fixation of the detection angle.

[0078] The embodiments of the present application are introduced in detail above. Specific examples are used in this article 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 core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A device for controlling the receiving angle of a muon detector, characterized in that: include: A fixed support, wherein the fixed support comprises a rotating shaft in a horizontal direction, and the muon detector can rotate around the rotating shaft; An inner plate, wherein the muon detector is fixedly arranged on the inner plate, the inner plate can rotate around the rotating shaft, a plurality of inner holes are arranged in an arc region of the inner plate, each inner hole is at an equal distance from the rotating shaft, and the angles between two adjacent inner holes are equal; An outer plate, the outer plate is fixedly arranged on the fixing bracket, a plurality of outer through holes are arranged in an arc region of the outer plate, each outer through hole is at an equal distance from the rotating shaft, and is at the same distance as each inner hole from the rotating shaft, and the angles between two adjacent outer through holes are equal; The latch can pass through any of the outer through holes and be inserted into any of the inner holes, so that the receiving angle of the muon detector is locked.

2. The device for controlling the receiving angle of a muon detector according to claim 1, characterized in that: The inner hole diameter is the same as the outer through hole diameter.

3. The device for controlling the receiving angle of a muon detector according to claim 1, characterized in that: The included angle between two adjacent inner holes is different from the included angle between two adjacent outer through holes.

4. The device for controlling the receiving angle of a muon detector according to claim 1 or 3, characterized in that: The angle between the two inner holes that are farthest apart is 90° to 180°.

5. The device for controlling the receiving angle of a muon detector according to claim 1 or 3, characterized in that: The angle between the two outer through holes which are farthest apart is 90° to 180°.

6. The device for controlling the receiving angle of a muon detector according to claim 1 or 2, characterized in that: A circular arc groove is arranged in another circular arc region of the outer plate, and the distance between the circular arc groove and the rotating shaft is the same as the distance between each inner hole and the rotating shaft.

7. The device for controlling the receiving angle of a muon detector according to any one of claims 1 to 3, characterized in that: It includes two inner plates, two outer plates and two latches, which are respectively located on both sides of the muon detector.

8. The device for controlling the receiving angle of a muon detector according to any one of claims 1 to 3, characterized in that: When the pin is inserted into the leftmost outer through hole and the rightmost inner hole, the muon detector is at the rightmost maximum receiving angle; when the pin is inserted into the rightmost outer through hole and the leftmost inner hole, the muon detector is at the leftmost maximum receiving angle.

9. The device for controlling the receiving angle of a muon detector according to claim 3, characterized in that: The angle between the two adjacent inner holes is 10°, and the angle between the two adjacent outer through holes is 9°.

10. The device for controlling the receiving angle of a muon detector according to claim 3, characterized in that: The angle between the two adjacent inner holes is 9°, and the angle between the two adjacent outer through holes is 10°.

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