Scintillating Fiber Optic Detectors

Abstract

The present invention relates to a scintillation fiber detector, comprising: a plurality of groups of scintillation fiber bundles (10), wherein the plurality of groups of scintillation fiber bundles (10) extend in parallel and are arranged side by side in sequence in a vertical direction of the extending direction; two fixed brackets (20), respectively fixed to the ends of the scintillation fiber bundles; and two groups of photoelectric detection devices (30), respectively fixed to the corresponding fixed brackets (20) and attached to the end faces of the scintillation fiber bundles (10) to electrically couple with the scintillation fiber bundles (10); according to detection requirements, a large number of scintillation fibers are grouped as required to form a plurality of scintillation fiber bundles through calculation, and the parallel extending scintillation fiber bundles are arranged side by side, thereby reducing the ineffective area of ​​the detection layer composed of the fiber bundles; and since the number of optical fibers in each group is small, the reserved length for bending is short, thereby reducing the volume and weight of the scintillation fiber detector.

Description

Technical Field

[0001] The present disclosure relates to the field of ray detection, and in particular, to a scintillation optical fiber detector. Background Art

[0002] In the decommissioning of nuclear facilities, 90 The measurement of Sr content is very important. The stacked scintillator detector can eliminate the redundant interfering rays in the signal and realize the measurement of Sr content in the soil. 90 Measurement of Sr. The commonly used detection equipment at present is to form a detection surface with hundreds of optical fibers, which are tightly bundled at both ends, and coupled with PMT after polishing the end face. The fluorescence caused by the rays in the optical fiber is transmitted to both ends and received by PMT and converted into electrical signals. The results are analyzed in the back-end circuit. The problem with this collection method is that hundreds of optical fibers converge into a bundle, which will cause more invalid areas on the detection surface due to mutual influence, and at the end of the optical fiber bundle, in order to control the fluorescence transmission loss caused by excessive bending, a sufficient length of optical fiber is usually reserved for bundling, which will increase the size and weight of the detector and make it inconvenient to use. Summary of the invention

[0003] An object of the present disclosure is to provide a scintillation fiber optic detector to at least partially solve the problems in the related art.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a scintillation fiber detector, comprising: a plurality of groups of scintillation fiber bundles, wherein the plurality of groups of scintillation fiber bundles extend in parallel and are arranged side by side in sequence in a vertical direction of the extension direction; two fixed brackets, respectively fixed to the ends of the scintillation fiber bundles; and two groups of photoelectric detection devices, respectively fixed to the corresponding fixed brackets and attached to the end faces of the scintillation fiber bundles to be electrically coupled with the scintillation fiber bundles.

[0005] Optionally, the photoelectric detection device is S i PM, S i PM includes a chip, the scintillating fiber bundle runs from the first side of the fixing bracket to the opposite second side and is flush with the second side, the chip is coated with an optical silicone grease layer, the chip is attached to the second side and completely covers the end face of the scintillating fiber bundle.

[0006] Optionally, the photoelectric detection device further comprises a circuit board, the chip is attached to and protrudes from the circuit board, the circuit board is fixed to the fixing bracket and presses the chip against the end face of the scintillation fiber bundle.

[0007] Optionally, a sealing gasket surrounding the chip is further included, wherein the sealing gasket fills a gap between the circuit board and the second side of the fixing bracket.

[0008] Optionally, the circuit board and the sealing gasket are fixed to the fixing bracket by threaded fasteners passing through the first through hole and the second through hole in sequence.

[0009] Optionally, the sealing gasket is interference fit with the chip.

[0010] Optionally, a thermally conductive adhesive sheet is further included, and the thermally conductive adhesive sheet is adhered and fixed to a side of the plurality of circuit boards away from the chip.

[0011] Optionally, it also includes a radiator and a liquid cooling pipeline arranged on the thermal conductive film, and the liquid cooling pipeline is connected to the radiator.

[0012] Optionally, a constraint hole is opened on the fixing bracket for the scintillating optical fiber bundle to pass through, and the scintillating optical fiber bundle is tightly inserted into the constraint hole and cured into the fixing bracket by epoxy resin.

[0013] Optionally, the fixing bracket is configured as a long strip extending along an arrangement direction of the plurality of groups of scintillation optical fiber bundles.

[0014] Through the above technical scheme, according to the detection requirements, through calculation, a large number of scintillation optical fibers are grouped as required to form multiple scintillation optical fiber bundles, and the parallel extending scintillation optical fiber bundles are arranged side by side, so as to reduce the ineffective area of ​​the detection layer composed of the optical fiber bundles. Moreover, since the number of optical fibers in each group is small and the reserved length for bending is short, the volume and weight of the scintillation optical fiber detector can be reduced.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 is a first perspective schematic diagram of a scintillation fiber detector according to an exemplary embodiment of the present disclosure, wherein, in order to clearly show the structure, the SiPM, the thermal conductive film and the liquid cooling pipeline are shown in the form of an exploded view;

[0018] Figure 2 is a second perspective schematic diagram of a scintillation fiber detector according to an exemplary embodiment of the present disclosure, wherein, in order to clearly show the structure, the SiPM, the thermal conductive film and the liquid cooling pipeline are shown in the form of an exploded view;

[0019] Figure 3 yes Figure 2 A partial enlarged view of part A.

[0020] Description of Reference Numerals

[0021] 10 Flashing fiber bundle 20 Fixing bracket

[0022] 21 Constraint hole 30 Photoelectric detection device

[0023] 31 Chip 32 Circuit Board

[0024] 321 first through hole 40 sealing gasket

[0025] 41 second through hole 50 thermal conductive film

[0026] 51 Liquid cooling pipeline DETAILED DESCRIPTION

[0027] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0028] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] Reference Figure 1 The present disclosure provides a scintillation fiber detector, comprising a plurality of scintillation fiber bundles 10, two fixed brackets 20, and two groups of photoelectric detection devices corresponding to the two brackets 20. The plurality of scintillation fiber bundles 10 extend in parallel and are arranged side by side in a vertical direction of the extending direction, thereby forming Figure 1 The two fixed brackets 20 are respectively fixed to the ends of the scintillation fiber bundles, that is, the ends of each group of scintillation fiber bundles 10 are fixed to the fixed brackets 20. The photoelectric detection device 30 is fixed to its corresponding fixed bracket 20 and attached to the end surface of the scintillation fiber bundle 10 to electrically couple with the scintillation fiber bundle 10 and receive the detection signal.

[0030] It should be noted that "scintillating optical fiber" refers to a functional material that has both particle detection and optical signal transmission, which is composed of a core layer and a cladding layer, and the refractive index of the core layer is greater than the refractive index of the cladding layer. Scintillating optical fiber has the advantages of small detection unit granularity, long light attenuation length, short luminous decay time, and strong plasticity. The specific structure of the scintillating optical fiber is well known to those skilled in the art, and will not be described in detail here. In some embodiments, the scintillating optical fiber is a plastic scintillating optical fiber. Of course, in some other embodiments, it can also be replaced by a glass scintillating optical fiber or a crystal scintillating optical fiber. Each group of scintillating optical fiber bundles 10 is formed by a plurality of scintillating optical fibers gathered together, and the number of scintillating optical fibers in each group can be set according to actual needs. For example, when the total number of scintillating optical fibers is 100, it can be divided into 10 groups, and the number of each group can be 10. When the total number of scintillating optical fibers is 500, it can be divided into 20 groups, and the number of each group can be 25. The ratio of the number of groups to the total number can be, for example, 1:10-1:30, and the ratio of the cross-sectional area of ​​each scintillating optical fiber to the cross-sectional area of ​​a group of scintillating optical fiber bundles 1 can be 1:20-1:40. In addition, the number of scintillation optical fibers in each bundle may be the same or different. For the convenience of description, the following only takes the case where the number of each bundle is the same as an example for explanation.

[0031] Through the above technical solution, after a large number of scintillating optical fibers are grouped and arranged in bundles, multiple groups of scintillating optical fiber bundles are arranged in a single row, thereby reducing the ineffective area of ​​the detection layer composed of the optical fiber bundles. Since the number of each group is less than the number of all the scintillating optical fibers in one bundle, the required bending reserve length becomes smaller, so that the volume and weight of the optical fiber detector are reduced.

[0032] In order to arrange the multiple groups of scintillating optical fiber bundles 10 side by side in sequence in the vertical direction of the extension direction, in some embodiments, the fixing bracket 20 is configured as a long strip extending along the arrangement direction of the multiple groups of scintillating optical fiber bundles 10, so as to minimize the volume of the fixing bracket 20. In addition, in some other embodiments, the fixing bracket 20 may also be a long plate extending along the arrangement direction of the multiple groups of scintillating optical fiber bundles 10, which is not limited in the present disclosure.

[0033] Here, the present disclosure does not limit the selection of the photoelectric detection device 30. For example, according to some embodiments, the photoelectric detection device 30 may be selected from S i PM (Silicon photomultiplier). Of course, S i The PM may be replaced with other components with better photoelectric conversion performance, such as high-temperature photomultiplier tubes, low-temperature photomultiplier tubes, low-background radiation photomultiplier tubes, etc., and the present disclosure does not limit this.

[0034] S iPM includes a chip 31 coated with an optical silicone grease layer. In order to make the scintillating fiber bundle 10 fit better with the photoelectric detection device 30 and receive the optical signal transmitted by the scintillating fiber bundle 10 to the maximum extent, in some embodiments, the scintillating fiber bundle 10 passes through the first side of the fixed bracket 20 to the opposite second side and is flush with the second side. The chip 31 is attached to the second side and completely covers the end face of the scintillating fiber bundle 10. Of course, in other embodiments, the optical silicone grease can be replaced by other optical coupling agents, such as silicone oil, and the present disclosure does not limit the material selection.

[0035] Reference Figure 2 and 3 The photoelectric detection device 30 further includes a circuit board 32, and the chip 31 is attached to and protrudes from the circuit board 32. The chip 31 can be fixed to the end face of the scintillation fiber bundle 10 by fixing the circuit board 32 to the fixing bracket 20. Specifically, the circuit board 32 is fixed to the fixing bracket 20 and the chip 31 is pressed against the end face of the scintillation fiber bundle 10. In addition, the chip 31 and the circuit board 32 can also be provided separately, and the chip 31 can be fixed to the fixing bracket 20 by welding or bolting and attached to the end face of the scintillation fiber bundle 10. The present disclosure does not limit the specific fixing method.

[0036] Reference Figure 1 and Figure 2 The scintillation fiber detector further includes a sealing gasket 40 surrounding the chip 31, and the sealing gasket 40 fills the gap between the circuit board 32 and the second side of the fixing bracket 20 to prevent the optical silicone grease from volatilizing. Of course, in some other embodiments, the gap between the circuit board 32 and the second side of the fixing bracket 20 can be filled with multiple layers of airtight films to prevent the optical silicone grease from volatilizing when it contacts the air.

[0037] In order to fix the circuit board 32 and the sealing gasket 40 on the fixing bracket 20, refer to Figure 3 In some embodiments, the circuit board 32 may be provided with a first through hole 321, and the sealing gasket 40 may be provided with a second tube through hole 41 at a position corresponding to the first through hole 321. The circuit board 32 and the sealing gasket 40 are fixed to the fixing bracket 20 by threaded fasteners that sequentially pass through the first through hole 321 and the second through hole 41. In addition, in some other embodiments, the circuit board 32 may be fixed to the fixing bracket 20 by welding, and the sealing gasket 40 may be compressed, which is not limited in the present disclosure.

[0038] Furthermore, in some embodiments, the sealing gasket 40 and the chip 31 may be interference-fitted so that no radial relative displacement occurs therebetween, and the sealing gasket 40 completely wraps the optical silicone grease to prevent volatilization.

[0039] In order to remove the heat generated by the circuit board 32 during operation and avoid excessively high accumulated heat temperature causing the circuit board 32 to fail to work normally, refer to Figure 1 and Figure 2 In some embodiments, the scintillation fiber detector may further include a thermal conductive film 50, which is fixed to a side of the plurality of circuit boards 32 away from the chip 31. Of course, in some other embodiments, thermal conductive silicone grease may be used instead of the thermal conductive film 50, which is not limited in the present disclosure.

[0040] Reference Figure 1 and Figure 2 In some embodiments, in order to dissipate the heat of the thermal conductive film 50, the scintillation fiber detector further includes a heat sink and a liquid cooling pipeline 51 disposed on the thermal conductive film 50, and the liquid cooling pipeline 51 is connected to the heat sink. In addition, in some other embodiments, the liquid cooling pipeline 51 can be replaced by an air cooling pipeline, and the present disclosure does not limit the type of the cooling pipeline.

[0041] In order to stably fix the scintillation fiber bundle in the fixed bracket 20, in some embodiments, a constraint hole 21 is opened on the fixed bracket 20 for the scintillation fiber bundle 10 to pass through, and the scintillation fiber bundle 10 is tightly inserted into the constraint hole 21 and cured into the fixed bracket 20 by epoxy resin. Here, the epoxy resin can be replaced with silicone oil, which is not limited in the present disclosure. The arrangement of the multiple scintillation fibers in the scintillation fiber bundle 10 is set according to the shape of the constraint hole 21, for example, referring to Figure 1 The constraint hole 21 is configured as a square hole. Of course, in some other embodiments, it may also be a rectangle, which is not limited in the present disclosure.

[0042] A specific example of the scintillation fiber detector disclosed in the present invention is given below. For example, the scintillation fiber detector is composed of a total of 625 scintillation optical fibers, each of which has a cross-section of a 1mm*1mm square, which are divided into 25 groups, each with 25 fibers, that is, a scintillation fiber bundle includes 25 optical fibers, and the 25 optical fibers are arranged in five rows and five columns, that is, the end face of the scintillation fiber bundle is a 5mm*5mm square, and all the end faces of the scintillation fiber bundles pass through the constraint holes 21 of the fixed bracket 20 respectively. The two fixed brackets 20 here have 25 constraint holes 21 respectively, and the end face of each constraint hole 21 is a 5mm*5mm square.

[0043] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0045] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A scintillation optical fiber detector, characterized in that: include: A plurality of groups of scintillation optical fiber bundles (10), wherein the plurality of groups of scintillation optical fiber bundles (10) extend in parallel and are arranged side by side in sequence in a vertical direction of the extension direction; Two fixing brackets (20) are respectively fixed to the ends of the scintillation optical fiber bundles, each of the fixing brackets (20) is provided with a plurality of restraining holes (21) for the scintillation optical fiber bundles (10) to pass through, and each group of the scintillation optical fiber bundles (10) is inserted into a corresponding restraining hole (21); and Two groups of photoelectric detection devices (30) are respectively fixed on the corresponding fixing brackets (20) and attached to the end surface of the scintillation optical fiber bundle (10) to be electrically coupled with the scintillation optical fiber bundle (10).

2. The scintillation fiber optic detector according to claim 1, characterized in that: The photoelectric detection device (30) is S i PM, S i PM includes CHIP (31); The scintillation optical fiber bundle (10) extends from a first side of the fixing bracket (20) to an opposite second side and is flush with the second side; The chip (31) is coated with an optical silicone grease layer, and the chip (31) is attached to the second side and completely covers the end face of the scintillation optical fiber bundle (10).

3. The scintillation fiber optic detector according to claim 2, characterized in that: The photoelectric detection device (30) further comprises a circuit board (32), the chip (31) being attached to and protruding from the end surface of the circuit board (32), the circuit board (32) being fixed to the fixing bracket (20) and pressing the chip (31) against the end surface of the scintillation optical fiber bundle (10).

4. The scintillation fiber optic detector according to claim 3, characterized in that: It also includes a sealing gasket (40) surrounding the chip (31), wherein the sealing gasket (40) fills a gap between the circuit board (32) and the second side of the fixing bracket (20).

5. The scintillation fiber optic detector according to claim 4, characterized in that: The circuit board (32) and the sealing gasket (40) are fixed to the fixing bracket (20) by means of threaded fasteners that pass through the first through hole (321) and the second through hole (41) in sequence.

6. The scintillation fiber optic detector according to claim 4, characterized in that: The sealing gasket (40) is interference fit with the chip (31).

7. The scintillation fiber optic detector according to claim 3, characterized in that: It also comprises a thermally conductive adhesive sheet (50), wherein the thermally conductive adhesive sheet (50) is adhered and fixed to a side of the plurality of circuit boards (32) away from the chip (31).

8. The scintillation fiber optic detector according to claim 7, characterized in that: It also comprises a radiator and a liquid cooling pipeline (51) arranged on the thermally conductive rubber sheet (50), wherein the liquid cooling pipeline (51) is in communication with the radiator.

9. The scintillation fiber optic detector according to claim 2, characterized in that: The scintillating optical fiber bundle (10) is tightly inserted into the constraining hole (21) and is cured into the fixing bracket (20) by epoxy resin.

10. The scintillation fiber optic detector according to any one of claims 1 to 9, characterized in that: The fixing bracket (20) is configured as a long strip extending along the arrangement direction of the multiple groups of scintillation optical fiber bundles (10).

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