Detection device

Abstract

The invention relates to the technical field of photoelectric signals, and provides a detection device which comprises an optical fiber, a photomultiplier and an optical fiber coupler, the optical fiber is provided with a light output end face, and the photomultiplier is provided with a light receiving end face. The optical fiber coupler comprises a limiting piece and a fixing base, the limiting piece comprises a limiting column and a limiting plate, the limiting column forms a limiting cavity with openings in the two axial sides, and the limiting plate is arranged at the opening in the first axial side of the limiting cavity; the fixing base is arranged on the second side of the limiting piece in the axial direction, a containing cavity communicated with the limiting cavity is formed in the fixing base, part of the optical fiber is contained in the limiting cavity, the limiting plate abuts against the optical fiber along the side face in the axial direction, the photomultiplier is connected with the fixing base, part of the photomultiplier is located in the containing cavity, and the light receiving end face faces the light output end face. According to the detection device provided by the embodiment of the invention, the detection efficiency of the detection device can be improved.

Description

Technical Field

[0001] The present application relates to the field of photoelectric signal technology, and in particular to a detection device. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] Silicon Photomultiplier (SiPM), Silicon Photomultiplier is an emerging photodetector device that can be powered by low voltage and used to make large-area detector arrays. SiPM consists of hundreds or thousands of self-quenched single photon avalanche photodiodes (SAPDs), also known as pixels or micro units. When a photon is incident on a photodiode, an electron-hole pair is generated. Due to the electric field distribution of the PN junction in the photodiode, the electrons and holes are accelerated and separated to form a current, which is called dark current. It is proportional to the energy of the photon and the intensity of the incident light.

[0004] In the related art, light is guided to the silicon photomultiplier through an optical fiber, but the coupling effect between the optical fiber and the silicon photomultiplier is poor, which affects the detection efficiency. Summary of the invention

[0005] In view of this, an embodiment of the present application hopes to provide a detection device that can improve the detection efficiency of the detection device.

[0006] The present application provides a detection device, including:

[0007] An optical fiber having a light output end face;

[0008] A photomultiplier having a light receiving end surface;

[0009] An optical fiber coupler, the optical fiber coupler comprising:

[0010] A limiting member, the limiting member comprising a limiting column and a limiting plate, the limiting column forming a limiting cavity with openings on both sides along the axial direction, the limiting plate being arranged at the opening of the limiting cavity on the first side along the axial direction;

[0011] A fixing seat is arranged on the second side of the limiting member along the axial direction, the fixing seat forms a receiving cavity connected with the limiting cavity, part of the optical fiber is received in the limiting cavity, the side surface of the limiting plate along the axial direction abuts against the optical fiber, the photomultiplier is connected to the fixing seat, part of the photomultiplier is located in the receiving cavity, and the light receiving end face faces the light output end face.

[0012] In some embodiments, the detection device includes a plastic scintillator, and one end of the optical fiber away from the photomultiplier is connected to the plastic scintillator.

[0013] In some embodiments, one end of the optical fiber away from the photomultiplier is embedded in the plastic scintillator.

[0014] In some embodiments, the detection device includes a protective sleeve, and the protective sleeve includes a first sleeve body that is sleeved on the outside of the optical fiber, the first sleeve body is located in the limiting cavity, and the first sleeve body and the limiting plate are abutted along axially opposite sides.

[0015] In some embodiments, the protective sleeve includes a second sleeve body sleeved on the outside of the optical fiber, and the second sleeve body extends from the first sleeve body toward the first side to the outside of the limiting cavity.

[0016] In some embodiments, a plane perpendicular to the axial direction is taken as a projection plane, and the projection of the limiting cavity is located within the projection range of the accommodating cavity.

[0017] In some embodiments, the photomultiplier includes a photomultiplier module, and the photomultiplier module is accommodated in the accommodating cavity, and a cavity wall surface of the accommodating cavity abuts against a circumferential surface of the photomultiplier module.

[0018] In some embodiments, the photomultiplier includes a circuit board, the optical fiber coupler includes a fastener, the fixing seat is formed with a fixing hole, and the fastener is inserted through the fixing hole and the circuit board.

[0019] In some embodiments, the fixing base is formed with a penetrating heat dissipation groove, the circuit board is formed with a through hole, the heat dissipation groove is connected to the through hole, the detection device includes components, the components are arranged on a side of the circuit board axially away from the fixing base, and the pins of the components can be passed through the heat dissipation groove and the through hole.

[0020] In some embodiments, taking a plane perpendicular to the top and bottom directions as a projection plane, at least a portion of the projection of the through hole is located within the projection range of the heat dissipation slot.

[0021] In some embodiments, the limiting member is threadably matched with the fixing seat.

[0022] In some embodiments, the optical fiber is a wave-shifted optical fiber.

[0023] The detection device provided by the embodiment of the present application, on the one hand, the side of the limit plate along the axial direction abuts the optical fiber, and the end of the optical fiber away from the limit plate along the axial direction abuts the photomultiplier, and the limit plate and the photomultiplier limit the displacement of the optical fiber along the axial direction to prevent the displacement of the optical fiber from scratching the surface of the photomultiplier. On the other hand, the limit column is formed with a limit cavity extending along the axial direction, so that the circumferential surface of the limit cavity limits the displacement of the optical fiber along the radial direction. On the other hand, the photomultiplier is connected to the fixed seat, which can prevent the fixed seat from loosening and shifting, and maintain the stability of the light in the process of transmitting from the light output end face to the light receiving end face. On the other hand, the light receiving end face faces the light output end face, and the light emitted from the light output end face can be transmitted to the light receiving end face as much as possible, thereby increasing the number of photons received by the light receiving end face, so that the coupling between the optical fiber and the photomultiplier tube is better, which can not only improve the detection efficiency, but also be suitable for processing low-intensity light signals and expand the scope of use of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a detection device provided in some embodiments of the present application;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 for Figure 2 Cross-sectional view at position aa;

[0027] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0028] Figure 5 A schematic diagram of the structure of a protective cover provided in some embodiments of the present application;

[0029] Figure 6 A schematic diagram of the structure of the optical fiber and the photomultiplier assembly provided in some embodiments of the present application;

[0030] Figure 7 A schematic diagram of the structure of a fixing base provided in some embodiments of the present application;

[0031] Figure 8 for Figure 2 Schematic diagram of the structure from another perspective;

[0032] Fig. 9 A schematic diagram of the structure of a limiter provided in some embodiments of the present application.

[0033] Description of Reference Numerals

[0034] Detection device 100;

[0035] Optical fiber 1; light output end face 1a;

[0036] Photomultiplier 2; light receiving end surface 2a; photomultiplier module 21; circuit board 22; through hole 22a;

[0037] Fiber coupler 3; limiting member 31; limiting column 311; limiting cavity 311a; external thread 311b; limiting plate 312;

[0038] Fixed seat 32; accommodating cavity 32a; fixing hole 32b; heat dissipation groove 32c; internal thread 32d;

[0039] Plastic scintillator 4;

[0040] Protective cover 5; first cover body 51; first cavity 51a; second cover body 52; second cavity 52a. DETAILED DESCRIPTION

[0041] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0042] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in this application are no longer described separately. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] See also Figures 1 to 9 The embodiment of the present application provides a detection device 100, including an optical fiber 1, a photomultiplier 2 and an optical fiber coupler 3, wherein the optical fiber 1 has a light output end face 1a, and the photomultiplier 2 has a light receiving end face 2a.

[0044] The optical fiber 1 is used to transmit light, and the light is emitted from the light output end face 1a after multiple reflections in the optical fiber 1. The photomultiplier 2 is used to receive light, and the light enters the photomultiplier 2 through the light receiving end face 2a to form a pulse current.

[0045] The optical fiber coupler 3 includes a limit member 31 and a fixing seat 32. The limit member 31 includes a limit column 311 and a limit plate 312. The limit column 311 forms a limit cavity 311a with openings on both sides along the axial direction. The limit plate 312 is arranged at the opening of the limit cavity 311a on the first side along the axial direction; the fixing seat 32 is arranged on the second side along the axial direction of the limit member 31. The fixing seat 32 forms a accommodating cavity 32a connected to the limit cavity 311a. Part of the optical fiber 1 is accommodated in the limit cavity 311a. The side surface of the limit plate 312 along the axial direction abuts against the optical fiber 1. The photomultiplier 2 is connected to the fixing seat 32. Part of the photomultiplier 2 is located in the accommodating cavity 32a, and the light receiving end face 2a faces the light output end face 1a.

[0046] The limiting member 31 has a limiting and guiding effect on the optical fiber 1. On the one hand, the side surface of the limiting plate 312 along the axial direction abuts against the optical fiber 1, and the end of the optical fiber 1 away from the limiting plate 312 along the axial direction abuts against the photomultiplier 2. The limiting plate 312 and the photomultiplier 2 limit the displacement of the optical fiber 1 along the axial direction to prevent the displacement of the optical fiber 1 from scratching the surface of the photomultiplier 2. On the other hand, the limiting column 311 is formed with a limiting cavity 311a extending along the axial direction, so that the circumferential surface of the limiting cavity 311a limits the displacement of the optical fiber 1 along the radial direction.

[0047] The photomultiplier 2 is connected to the fixing seat 32. Specifically, the photomultiplier 2 is fixedly connected to the fixing seat 32, so that the connection stability between the photomultiplier 2 and the fixing seat 32 can be enhanced, the fixing seat 32 can be prevented from loosening and shifting, and the stability of the light can be maintained during the process of light being transmitted from the light output end face 1a to the light receiving end face 2a.

[0048] See also Figures 2 to 4 , a portion of the photomultiplier 2 located in the accommodating cavity 32a is formed with a light receiving end face 2a. The light receiving end face 2a facing the light output end face 1a means that the normal directions of the light receiving end face 2a and the light output end face 1a are basically consistent. For example, with the light receiving end face 2a as the projection surface, the projection of the light output end face 1a and the projection of the light receiving end face 2a at least partially overlap, so that the light emitted from the light output end face 1a can be transmitted to the light receiving end face 2a as much as possible, thereby increasing the number of photons received by the light receiving end face 2a, so that the coupling between the optical fiber 1 and the photomultiplier tube is better, which can not only improve the detection efficiency, but also be suitable for processing light signals with lower intensity, and expand the use range of the detection device 100.

[0049] It should be noted that the first axial side and the second axial side are located in opposite directions. For example, the axial direction may be an up-down direction, the first axial side may be an up direction, and the second axial side may be a down direction. Down refers to the direction toward the ground, and up is the opposite direction to down.

[0050] In the detection device 100 provided in the embodiment of the present application, on the one hand, the side surface of the limit plate 312 along the axial direction abuts against the optical fiber 1, and the end of the optical fiber 1 away from the limit plate 312 along the axial direction abuts against the photomultiplier 2. The limit plate 312 and the photomultiplier 2 limit the displacement of the optical fiber 1 along the axial direction to prevent the displacement of the optical fiber 1 and scratch the surface of the photomultiplier 2. On the other hand, the limit column 311 is formed with a limit cavity 311a extending along the axial direction, so that the circumferential surface of the limit cavity 311a limits the radial displacement of the optical fiber 1. On the other hand, the photomultiplier 2 is connected to the fixing seat 32, which can prevent the fixing seat 32 from loosening and shifting, and maintain the stability of the light in the process of transmitting from the light output end face 1a to the light receiving end face 2a. On the other hand, the light receiving end face 2a faces the light output end face 1a, and the light emitted from the light output end face 1a can be transmitted to the light receiving end face 2a as much as possible, thereby increasing the number of photons received by the light receiving end face 2a, so that the coupling between the optical fiber 1 and the photomultiplier tube is better, which can not only improve the detection efficiency, but also is suitable for processing lower intensity light signals, thereby expanding the scope of use of the detection device 100.

[0051] The photomultiplier 2 includes, but is not limited to, a silicon photomultiplier.

[0052] For some examples, see Figure 1 The detection device 100 includes a plastic scintillator 4, and one end of the optical fiber 1 away from the photomultiplier 2 is connected to the plastic scintillator 4. The plastic scintillator 4 is used to absorb radiation and convert it into light. The plastic scintillator 4 has high transparency, good light transmission performance, and is easy to manufacture. A larger volume of the plastic scintillator 4 can be manufactured to improve the detection efficiency.

[0053] For some examples, see Figure 1 , the end of the optical fiber 1 away from the photomultiplier 2 is embedded in the plastic scintillator 4. In this way, by partially embedding the optical fiber 1 in the plastic scintillator 4, not only the number of photons collected by the optical fiber 1 can be increased, and the collection efficiency of the optical fiber 1 can be improved. The length of the plastic scintillator 4 can also be extended, thereby increasing the surface area of ​​the plastic scintillator 4, and the plastic scintillator 4 can absorb more radiation rays, thereby improving the detection accuracy.

[0054] For some examples, see Figure 2 , Figure 3 and Figure 5 The detection device 100 includes a protective sleeve 5, which includes a first sleeve body 51 sleeved on the outside of the optical fiber 1, and the first sleeve body 51 is located in the limiting cavity 311a. The first sleeve body 51 and the limiting plate 312 are abutted against each other along the axially opposite sides.

[0055] The protective cover 5 protects the optical fiber 1 and prevents the stopper 31 from scratching the outer surface of the optical fiber 1. Figure 3The cavity wall surface of the limiting cavity 311a abuts against the circumferential surface of the first sleeve 51. The first sleeve 51 forms a first cavity 51a extending in the axial direction, and the cavity wall surface of the first cavity 51a abuts against the circumferential surface of a portion of the optical fiber 1. In this way, the first cavity 51a allows the portion of the optical fiber 1 located in the fixing column to extend in the axial direction, so that the portion of the optical fiber 1 can be laid in a relatively straight posture, and the optical fiber 1 can be prevented from being bent or entangled, thereby reducing the number of reflections of the light in the optical fiber 1, so that the light emitted from the light output end face 1a is more collimated.

[0056] The first sleeve 51 and the limiting plate 312 are in contact with each other along the axially opposite sides. For details, please refer to Figure 3 The end face of the first side of the first sleeve 51 along the axial direction abuts against the side face of the limiting plate 312. In this way, the limiting plate 312 also provides a supporting force for the first sleeve 51 to prevent the first sleeve 51 from moving along the axial direction, thereby maintaining the stability of the optical fiber 1 and preventing the optical fiber 1 from moving and scratching the surface of the photomultiplier 2.

[0057] The specific material of the protective cover 5 is not limited. For example, the protective cover 5 can be made of flexible material. The flexible material refers to a material that can produce elastic deformation such as bendable, foldable, twistable, compressible and / or stretchable. In this way, the first cover body 51 can be prevented from scratching the outer surface of the optical fiber 1, thereby providing better protection for the optical fiber 1.

[0058] Exemplarily, the flexible material may be plastic, that is, the protective cover 5 is made of plastic, which is cheap and can reduce production costs.

[0059] For some examples, see Figure 2 , Figure 3 and Figure 5 The protective sleeve 5 includes a second sleeve body 52 sleeved on the outside of the optical fiber 1, and the second sleeve body 52 extends from the first sleeve body 51 toward the first side to the outside of the limiting cavity 311a.

[0060] For example, see Figure 3 The second sleeve 52 forms a second cavity 52 a extending in the axial direction, and the cavity wall surface of the second cavity 52 a abuts against the circumferential surface of a portion of the optical fiber 1 .

[0061] In this embodiment, the second sleeve 52 can separate the limit plate 312 and the optical fiber 1, reducing the probability of the limit plate 312 scratching and wearing the outer surface of the optical fiber 1. In the process of assembling the detection device 100, the protective sleeve 5 and the optical fiber coupler 3 can be assembled first, and then the optical fiber 1 and the protective sleeve 5 can be assembled. Alternatively, the optical fiber 1 can be sleeved in the protective sleeve 5 first, and the first side of the optical fiber 1 along the axial direction does not extend out of the second cavity 52a. After the protective sleeve 5 and the optical fiber coupler 3 are assembled, the optical fiber 1 is pulled out of the second cavity 52a and embedded with the plastic scintillator 4.

[0062] For some examples, see Figure 4 , taking the plane perpendicular to the axial direction as the projection plane, the projection of the limiting cavity 311a is located within the projection range of the accommodating cavity 32a. In other words, the projection of the light receiving end surface 2a is located within the projection range of the accommodating cavity 32a, so that the light emitted from the light output end surface 1a can enter the accommodating cavity 32a as much as possible, and then be transmitted to the light receiving end surface 2a, preventing the light from diverging outside the light receiving end surface 2a.

[0063] For example, see Figure 4 , taking the plane perpendicular to the axial direction as the projection plane, the projection of the light output end surface 1a is located within the projection range of the light receiving end surface 2a. In other words, the area of ​​the light receiving end surface 2a is larger than the area of ​​the light output end surface 1a, so that the number of photons received by the light receiving end surface 2a can be increased, the detection efficiency can be improved, and the use range of the detection device 100 can be expanded.

[0064] For some examples, see Figure 4 and Figure 6 The photomultiplier 2 includes a photomultiplier module 21, which is accommodated in the accommodating cavity 32a, and the cavity wall surface of the accommodating cavity 32a abuts against the circumferential surface of the photomultiplier module 21. Specifically, the photomultiplier module 21 forms a light receiving end surface 2a.

[0065] Please continue reading Figure 4 The cavity wall surface of the accommodating cavity 32a abuts against the circumferential surface of the photomultiplier module 21, that is, the fixing seat 32 can provide support force for the photomultiplier module 21, prevent the photoelectric conversion module from loosening and displacement, improve the stability of the photoelectric conversion module, and ensure the operating reliability of the detection device 100.

[0066] In one embodiment, please refer to Figure 7 , with the plane perpendicular to the axial direction as the projection plane, the projection of the limiting cavity 311a is a square, that is, the limiting cavity 311a is roughly hexahedral, and the side length of the square is between 3mm and 4mm. Exemplarily, the side length of the square can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm or 4mm, etc. By setting a suitable size, photomultiplier modules 21 of different sizes can be prevented.

[0067] For some examples, see Figure 2 and Figure 6 The photomultiplier 2 includes a circuit board 22 , the optical fiber coupler 3 includes a fastener, the fixing seat 32 is formed with a fixing hole 32 b , and the fastener is penetrated through the fixing hole 32 b and the circuit board 22 .

[0068] The fasteners are provided through the fixing holes 32 b and the circuit board 22 , which can enhance the connection stability between the circuit board 22 and the fixing base 32 , prevent the fixing base 32 from loosening and shifting during operation, and ensure the operation reliability of the detection device 100 .

[0069] Fasteners include but are not limited to bolts or screws, etc.

[0070] In one embodiment, please refer to Figure 2 , Figure 7 and Figure 8 There are two fixing holes 32b, and the two fixing holes 32b are evenly spaced apart along the circumferential direction.

[0071] In one embodiment, the diameter of the fixing hole 32b is between 1 mm (millimeter) and 2 mm. For example, the diameter of the fixing hole 32b can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2 mm, etc. By setting a suitable size, it can be applicable to fasteners of different sizes.

[0072] For some examples, see Figure 2 and Figure 8 The fixing seat 32 is formed with a penetrating heat dissipation groove 32c, the circuit board 22 is formed with a through hole 22a, the heat dissipation groove 32c is connected to the through hole 22a, the detection device 100 includes components, and the components are arranged on a side of the circuit board 22 axially away from the fixing seat 32, and the pins of the components can be inserted into the heat dissipation groove 32c and the through hole 22a.

[0073] Components refer to basic units used to construct circuits, and include but are not limited to resistors, capacitors, inductors, etc. The components are connected to the circuit board 22 by welding through the through holes 22a.

[0074] On the one hand, the heat dissipation groove 32c is connected with the through hole 22a. In the process of welding components and circuit board 22, the heat generated by welding can be discharged outward through the heat dissipation groove 32c, thereby improving the heat dissipation efficiency and preventing hot air, welding slag, etc. from damaging the optical fiber coupler 3, the photomultiplier module 21 and other components. On the other hand, the pins of the components can be inserted into the heat dissipation groove 32c and the through hole 22a, and the heat dissipation groove 32c can be regarded as an avoidance space, so that the operator can weld and connect the components and circuit board 22 through the heat dissipation groove 32c, and the operation is convenient.

[0075] In one embodiment, please refer to Figure 8 There are two through holes 22a, and the two through holes 22a are evenly spaced apart along the circumferential direction.

[0076] For some examples, see Figure 8With the plane perpendicular to the axial direction as the projection plane, at least part of the projection of the through hole 22a is located within the projection range of the heat dissipation slot 32c. In this way, it is convenient for operators to observe the welding conditions of components and circuit boards 22 through the heat dissipation slot 32c.

[0077] In some embodiments, the stopper 31 and the fixing seat 32 are detachably connected. In this way, on the one hand, the stopper 31 and the fixing seat 32 can be manufactured separately, reducing the difficulty of designing and manufacturing the optical fiber coupler 3. On the other hand, during the assembly process, the fixing seat 32 can be first installed on the circuit board 22 so that the photomultiplier module 21 is accommodated in the accommodating cavity 32a, and then the optical fiber 1 is fixed to the stopper 31 through the protective cover 5, and finally the stopper 31 is installed on the fixing seat 32 so that the light output end face 1a faces the light receiving end face 2a, which is convenient and quick, and improves the assembly efficiency.

[0078] For some examples, see Figure 7 and Fig. 9 The limiting member 31 is threadedly matched with the fixing seat 32 .

[0079] The threaded fit between the stopper 31 and the fixing seat 32 not only facilitates the detachable connection between the stopper 31 and the fixing seat 32, but also allows the axial fixed position of the stopper 31 to be adjusted by adjusting the connection position between the stopper 31 and the fixing seat 32. For example, if the stopper 31 needs to be adjusted to the first side, the stopper 31 can be rotated forward to move the stopper 31 to the first side until the stopper 31 moves to the target fixed position, then the rotation can be stopped to complete the adjustment of the fixed position of the stopper 31; if the stopper 31 needs to be adjusted to the second side, the stopper 31 can be rotated reversely to move the stopper 31 to the second side until the stopper 31 moves to the target fixed position, then the rotation can be stopped to complete the adjustment of the fixed position of the stopper 31. In addition, the stopper 31 with a rod-shaped structure is easy to hold, which is convenient for the operator to adjust the axial fixed position of the stopper 31.

[0080] For example, see Figure 7 and Fig. 9 The limiting column 311 is formed with an external thread 311b, and the fixing seat 32 is formed with an internal thread 32d that cooperates with the external thread 311b. Through the cooperation of the external thread 311b and the internal thread 32d, the rotational motion of the limiting member 31 can be converted into axial motion of the limiting member 31. In this way, the limiting member 31 can be fixed at any fixed position to meet different usage requirements.

[0081] In some embodiments, the optical fiber 1 is a wave-shifting optical fiber.

[0082] Wave-length shifting fiber (WLS) is a special light-guiding fiber, which usually includes a green-light-emitting fiber surface material and a non-luminescent fiber core material, and can be used in conjunction with the plastic scintillator 4. Its working principle is to absorb the fluorescent photons in the blue light band emitted by the plastic scintillator 4, and re-emit the green scintillation light with a longer wavelength inside the fiber, and then transmit it to the photomultiplier module 21. By using the wave-shifting fiber, photons can be stably transmitted from the light output end face 1a to the light receiving end face 2a, thereby improving the detection efficiency of the detection device 100 and the uniformity of the light output.

[0083] In the description of this specification, the description with reference to the terms "an embodiment", "some embodiments" and "exemplary" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0084] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction. The above description is only a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A detection device, characterized in that: include: An optical fiber having a light output end face; A photomultiplier having a light receiving end surface; An optical fiber coupler, the optical fiber coupler comprising: A limiting member, the limiting member comprising a limiting column and a limiting plate, the limiting column forming a limiting cavity with openings on both sides along the axial direction, the limiting plate being arranged at the opening of the limiting cavity on the first side along the axial direction; A fixing seat is arranged on the second side of the limiting member along the axial direction, the fixing seat forms a receiving cavity connected with the limiting cavity, part of the optical fiber is received in the limiting cavity, the side surface of the limiting plate along the axial direction abuts against the optical fiber, the photomultiplier is connected to the fixing seat, part of the photomultiplier is located in the receiving cavity, and the light receiving end face faces the light output end face.

2. The detection device according to claim 1, characterized in that: The detection device comprises a plastic scintillator, and one end of the optical fiber away from the photomultiplier is connected to the plastic scintillator.

3. The detection device according to claim 2, characterized in that: One end of the optical fiber away from the photomultiplier is embedded in the plastic scintillator.

4. The detection device according to claim 1, characterized in that: The detection device comprises a protective sleeve, and the protective sleeve comprises a first sleeve body sleeved on the outside of the optical fiber, the first sleeve body is located in the limiting cavity, and the first sleeve body and the limiting plate are in abutment with each other along axially opposite sides.

5. The detection device according to claim 4, characterized in that: The protective sleeve comprises a second sleeve body sleeved on the outside of the optical fiber, and the second sleeve body extends from the first sleeve body toward the first side to the outside of the limiting cavity.

6. The detection device according to claim 1, characterized in that: Taking the plane perpendicular to the axial direction as the projection plane, the projection of the limiting cavity is located within the projection range of the accommodating cavity.

7. The detection device according to claim 1, characterized in that: The photomultiplier comprises a photomultiplier module, which is accommodated in the accommodating cavity, and a cavity wall surface of the accommodating cavity abuts against a circumferential surface of the photomultiplier module.

8. The detection device according to claim 1, characterized in that: The photomultiplier includes a circuit board, the optical fiber coupler includes a fastener, the fixing seat is formed with a fixing hole, and the fastener is inserted through the fixing hole and the circuit board.

9. The detection device according to claim 8, characterized in that: The fixing seat is formed with a penetrating heat dissipation groove, the circuit board is formed with a through hole, the heat dissipation groove is connected to the through hole, the detection device includes components, the components are arranged on a side of the circuit board axially away from the fixing seat, and the pins of the components can be inserted into the heat dissipation groove and the through hole.

10. The detection device according to claim 9, characterized in that: Taking the plane perpendicular to the top and bottom directions as the projection plane, at least part of the projection of the through hole is located within the projection range of the heat dissipation slot.

11. The detection device according to any one of claims 1 to 10, characterized in that: The limiting member is threadably matched with the fixing seat; And / or, the optical fiber is a wave-shifted optical fiber.

Images