CN213210489U - Moisture absorption scintillation crystal is two dampproofing packaging structure that passes through - Google Patents
Moisture absorption scintillation crystal is two dampproofing packaging structure that passes through Download PDFInfo
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- CN213210489U CN213210489U CN202021000822.7U CN202021000822U CN213210489U CN 213210489 U CN213210489 U CN 213210489U CN 202021000822 U CN202021000822 U CN 202021000822U CN 213210489 U CN213210489 U CN 213210489U
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Abstract
The utility model discloses a two dampproofing packaging structure that pass through of hygroscopicity scintillation crystal, two position circles of its characterized in that connect soon through interior external screw and constitute the cavity, are fixed with the hygroscopicity scintillation crystal of the attached reflector layer of lateral wall in this cavity. And the outer edge of the outer end face of the positioning ring is provided with a chamfer which is matched with the chamfer at the inner bottom end of the shell. The outer end face of the positioning ring is higher than the end face of the scintillation crystal at the same side by a certain distance to form a circular groove with a certain depth. The outer end face of the positioning ring is tightly attached to the optical window, the optical window is in coupling connection with the end face of the scintillation crystal through the optical coupling layer in the groove, and the depth of the groove determines the thickness of the optical coupling layer. The utility model effectively controls the optical coupling glue quantitatively, and ensures the uniformity of the thickness of the optical coupling glue; the scintillation crystal is effectively positioned, the vibration resistance and the impact resistance of the double-transmission packaging part are enhanced, and the dislocation of the crystal and the delamination of an optical coupling surface are avoided.
Description
Technical Field
The utility model relates to a hygroscopicity scintillation crystal packaging technology especially relates to a moisture-proof packaging structure of two encapsulation pieces that pass through of hygroscopicity scintillation crystal.
Background
The scintillation crystal has wide application in environmental monitoring, industrial measurement and control, nuclear medicine imaging, safety inspection, nuclear physics, high-energy physical science research and the like. At present, the scintillation crystals with excellent scintillation performance belong to crystals with hygroscopicity, such as cerium-doped lanthanum bromide (LaBr)3Ce crystal, cerium-doped lanthanum chloride (LaCl)3Ce crystal, cerium bromide (CeBr)3) Crystal, thallium-doped sodium iodide (NaI: Tl) crystal, europium-doped strontium iodide (SrI)2Eu) crystal, etc. The hygroscopic scintillation crystal needs to be strictly moisture-proof packaged before application, so that the hygroscopic scintillation crystal can be further manufactured into various nuclear instruments and applied to indoor or outdoor nuclear detection devices or systems.
For moisture-proof packaging of the hygroscopic scintillation crystal, most of the mature processes are single-transmission packaging (namely, one end of the packaging part is used as a light-emitting surface), and the double-transmission packaging (namely, two end surfaces of the packaging part are both light-emitting surfaces) has higher requirements on the processes. At present, the problems frequently occurring in the double-transmission moisture-proof packaging part of the hygroscopic scintillation crystal include crystal cracking, delamination of an optical coupling surface and the like, and the two main reasons are that the thickness of the optical coupling layer cannot be effectively controlled, and the crystal cannot be effectively positioned. Generally, when the conventional packaging method is used to perform double-transmission packaging on the hygroscopic scintillation crystal, in order to ensure that the optical coupling surface has no bubbles, the crystal needs to be repeatedly and forcibly squeezed to remove the bubbles. It is difficult to control the thickness of the optical coupling layer, and thus it is difficult to make the optical coupling layers on both end faces uniform. If no effective positioning mode exists, when the package is vibrated or impacted, the crystal and the package shell are easy to loosen, so that the position of the crystal is deviated, the optical coupling surface is delaminated, even the crystal is cracked, and the double-transparent package is scrapped.
Although a chinese patent (patent No. CN 210442513U) entitled "a high temperature resistant scintillation crystal package structure with light output windows at two ends" relates to a scintillation crystal package structure with light output optical windows at two ends, it does not relate to an effective control technique for the thickness of the optical coupling layer, nor to an effective positioning technique for the scintillation crystal in the housing, and thus it is difficult to avoid delamination of the optical coupling layer in the dual-transparent package. For the double-through packaging of the hygroscopic scintillation crystal, a reasonable and feasible solution is needed to realize the controllability and stability of the double-through packaging process of the hygroscopic scintillation crystal.
Disclosure of Invention
In order to solve the optical coupling layer thickness unevenness and the delaminating of appearing and the antidetonation of the two encapsulation pieces that pass through of hygroscopicity scintillation crystal among the prior art and move the poor difficult problem of impact, the utility model provides a two dampproofing packaging structure that pass through of novel hygroscopicity scintillation crystal is through the distance of new structural design control crystal and optical window to crystal in to the casing is effectively fixed a position.
The utility model provides a technical scheme that its technical problem adopted is: a novel hygroscopic scintillation crystal double-transmission moisture-proof packaging structure is adopted, and comprises a shell, a hygroscopic scintillation crystal, a reflecting layer, positioning rings, an optical window and an optical coupling layer, wherein a first positioning ring and a second positioning ring are sleeved on two end faces of the hygroscopic scintillation crystal, the cylindrical surface of the hygroscopic scintillation crystal is coated with the reflecting layer, the outer wall of the first positioning ring is provided with external threads, the inner wall of the second positioning ring is provided with internal threads, the two positioning rings are fastened and screwed through the internal threads and the external threads, the first positioning ring, the hygroscopic scintillation crystal, the reflecting layer and the second positioning ring form a scintillation crystal wrapping body, the outer end face of the first positioning ring is attached to the first optical window, the second positioning ring is attached to the second optical window, the first optical window is coupled with the first end face of the hygroscopic scintillation crystal through the first optical coupling layer, the second optical window is coupled with the second end face of the hygroscopic scintillation crystal through the second, the first optical window and the first shell are in sealing bonding through epoxy sealant, and the second optical window and the second shell are in sealing bonding through epoxy sealant.
Furthermore, the first locating ring and the second locating ring are made of polytetrafluoroethylene, the side face of the hygroscopic scintillation crystal is wrapped by the reflecting layer and fastened in a cavity formed by the locating ring rings, and the first locating ring is connected with the second locating ring through matched threads.
Furthermore, chamfers are machined on the outer edges of the outer end faces of the first positioning ring and the second positioning ring and are matched with chamfers at the inner bottom end of the shell.
Furthermore, the end faces of the first positioning ring and the second positioning ring are respectively provided with an end face with a step higher than the hygroscopic scintillation crystal, and the first positioning ring, the second positioning ring and the hygroscopic scintillation crystal respectively form two circular grooves with the first end face and the second end face.
Further, the circular groove is used for accommodating optical coupling glue to control the thickness of the first optical coupling layer and the second optical coupling layer.
Furthermore, the material of the light reflecting layer is a polytetrafluoroethylene film or an ESR reflecting film.
Furthermore, the hygroscopic scintillation crystal is NaI Tl crystal, CsI Tl crystal and LaCl3Ce crystal and LaBr3Ce crystal, CeBr3Crystal, SrI2Eu crystal, Cs2LiYCl6One of the Ce crystals.
Furthermore, the shell is made of one of stainless steel, titanium alloy, aluminum alloy and copper alloy.
Firstly, two positioning rings made of polytetrafluoroethylene or white hard plastic are prepared according to the shape of the hygroscopic scintillation crystal, and chamfers are machined on the outer edges of the outer end faces of the two positioning rings. The two positioning rings are connected through matched threads. The first locating ring is sleeved on the first end face of the scintillation crystal with the side face coated with the light reflecting layer, the second locating ring is sleeved on the second end face of the hygroscopic scintillation crystal, then the second locating ring is rotated to enable the two locating rings to be connected through threads, and the hygroscopic scintillation crystal is fastened in a cavity formed by the two locating rings to form the scintillation crystal inclusion. The outer end face of the positioning ring is 0.5-1 mm away from the end face of the hygroscopic scintillation crystal, namely the end face of the hygroscopic scintillation crystal inclusion is a groove of 0.5-1 mm, and the groove is used for accommodating and injecting a certain amount of optical coupling glue, thereby being beneficial to controlling the thickness of the optical coupling glue. The optical window is bonded to the metal case using an adhesive to constitute a first case and a second case. The outer edge of hygroscopicity scintillation crystal inclusion terminal surface all has 0.5-1.5 mm wide, 45 degrees chamfer, scintillation crystal inclusion outside and the inboard size phase-match of first shell, the chamfer of the outer terminal surface outward edge of first position circle and second position circle and the interior bottom chamfer phase-match of casing promptly, can make things convenient for scintillation crystal inclusion and first shell to carry out concentric location, avoid two encapsulation pieces to appear misplacing or damage when receiving vibrations or assaulting inside scintillation crystal, prevent that the phenomenon of delaminating from appearing in the optical coupling face. Four grooves are processed on the inner wall of the first shell, so that air bubbles and redundant glue can be discharged during optical coupling, and the coupling quality among the scintillation crystal, the optical coupling glue and the optical window can be ensured. And after the scintillation crystal inclusion and the first shell are optically coupled and cured, injecting optical coupling glue into the second end face of the scintillation crystal inclusion, and then buckling the second shell from the second end face so that the optical window on the second shell is fully coupled with the second end face through the optical coupling glue. The first housing and the second housing are sealed with a sealing adhesive therebetween.
The utility model has the advantages that the optical coupling glue is effectively and quantitatively controlled, and the uniformity of the thickness of the optical coupling glue is ensured; the scintillation crystal is effectively positioned, the vibration resistance and the impact resistance of the double-transmission packaging part are enhanced, and the dislocation of the crystal and the delamination of an optical coupling surface are avoided.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the package structure of the present invention;
FIG. 3 is a schematic view of the square structure of the present invention;
fig. 4 is a cross-sectional view of the square package structure of the present invention.
In the figure, 1, a first optical window, 2, a first optical coupling layer, 3, a first shell, 4, a first positioning ring, 5, a light reflecting layer, 6, a second positioning ring, 7, a second shell, 8, a second optical coupling layer, 9, a second optical window, 10, a second end face, 11, a hygroscopic scintillation crystal and 12, a first end face are shown.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with specific embodiments.
[ example 1 ]
The embodiment provides a cerium-doped lanthanum bromide crystal (hereinafter referred to as crystal) double-transparent moisture-proof packaging structure, so that the optical coupling glue is effectively and quantitatively controlled, and the thickness uniformity of the optical coupling glue is ensured; effectively positioning the scintillation crystal. The double-transmission moisture-proof packaging structure comprises a first optical window 1, a first optical coupling layer 2, a first shell 3, a first positioning ring 4, a reflecting layer 5, a second positioning ring 6, a second shell 7, a second optical coupling layer 8, a second optical window 9 and a crystal 11. First optical window 1 and the 9 materials of second optical window are optical quartz glass, first casing 3 and the 7 materials of second casing are the stainless steel, 5 materials of reflector layer are polytetrafluoroethylene film or ESR reflectance coating, first optical coupling layer 2 and the 8 materials of second optical coupling layer are the condensate of liquid optics organic silica gel, first position circle 4 and the 6 materials of second position circle are polytetrafluoroethylene. The crystal 11 can be a cylindrical crystal with the diameter of 76 mm and the height of 25 mm, the thickness of the reflecting layer 5 is 0.5 mm, and 5 layers of polytetrafluoroethylene films with the thickness of 0.1 mm are superposed to form the reflecting layer.
The corresponding packaging method comprises the following steps: firstly, respectively adhering a first optical window 1 and a first shell 3, and a second optical window 9 and a second shell 7 by using a sealing adhesive, and completely curing for later use; secondly, sequentially grinding and polishing the crystal in a vacuum glove box with the humidity less than or equal to 10 ppm and the oxygen content less than or equal to 10 ppm, and coating 5 layers of polytetrafluoroethylene films with the thickness of 0.1 mm on the side surface of the crystal to be used as a reflective layer to obtain the crystal with the reflective layer; and thirdly, sleeving the first positioning ring 4 on the first end surface 12 of the crystal with the reflective layer, sleeving the second positioning ring 6 from the second end surface 10, rotating the second positioning ring 6 to enable the two positioning rings to be connected through threads, and forming circular grooves with the diameter of 49 mm and the depth of 0.5-1 mm between the outer end surface of the first positioning ring 4 and the first end surface 12 of the crystal and between the outer end surface of the second positioning ring 6 and the second end surface 10 of the crystal respectively, wherein the circular grooves are called as a first circular groove and a second circular groove respectively. Thus, the crystal with the reflecting layer is tightly fixed in the cavity formed by the two positioning rings to form a so-called crystal inclusion body; fourthly, injecting liquid optical organic silica gel into the first circular groove of the crystal inclusion, then placing the crystal inclusion into the cavity of the first shell 3, uniformly coupling and bonding the crystal inclusion with the inner surface of the first optical window 1, injecting liquid optical organic silica gel into the second circular groove of the scintillator inclusion after the optical organic silica gel in the first circular groove is solidified, and then buckling the second shell 7 to uniformly coupling and bonding the inner surface of the second optical window 9 with the optical organic silica gel; and a fifth step of hermetically welding the joint between the first case 3 and the second case 7 using a laser welding machine installed in a vacuum glove box. And finally, taking the packaging piece out of the vacuum glove box after the temperature of the packaging piece shell is cooled to room temperature.
[ example 2 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the first positioning ring 4 and the second positioning ring 6 may be made of white hard plastic.
[ example 3 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the hygroscopic scintillation crystal 11 can also have a diameter dimension of 15-100 mm and a thickness dimension of 2-100 mm.
[ example 4 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the hygroscopic scintillation crystal 11, the positioning ring, the shell and the optical window can also be cuboid or cubic, and the first positioning ring 4 and the second positioning ring 6 can be bonded by epoxy glue.
[ example 5 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the first shell 3 and the second shell 7 may also be made of titanium alloy or other metal materials.
[ example 6 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the optical coupling layer can be a solid flexible optical organic silica gel sheet.
[ example 7 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: and the contact position between the first shell 3 and the second shell 7 is hermetically connected by adopting epoxy sealant.
[ example 8 ]
The same features of this embodiment as those of embodiment 1 are not described again, and the different features of this embodiment from those of embodiment 1 are: the hygroscopic scintillation crystal 11 is other scintillation crystals such as NaI Tl crystal, CsI Tl crystal, and LaCl crystal3Ce crystal, CeBr3Crystal, SrI2Eu crystals or Cs crystals2LiYCl6Ce crystal.
Claims (8)
1. A hygroscopic scintillation crystal double-transmission moisture-proof packaging structure is characterized by comprising a shell, a hygroscopic scintillation crystal, a reflecting layer, positioning rings, an optical window and an optical coupling layer, wherein a first positioning ring and a second positioning ring are sleeved on two end faces of the hygroscopic scintillation crystal, the reflecting layer is coated on the cylindrical surface of the hygroscopic scintillation crystal, the outer wall of the first positioning ring is provided with an external thread, the inner wall of the second positioning ring is provided with an internal thread, the two positioning rings are fastened and screwed through the internal thread and the external thread, the first positioning ring, the hygroscopic scintillation crystal, the reflecting layer and the second positioning ring form a scintillation crystal wrapping body, the outer end face of the first positioning ring is attached to the first optical window, the second positioning ring is attached to the second optical window, the first optical window is coupled with the first end face of the hygroscopic scintillation crystal through the first optical coupling layer, the second optical window is coupled with the second end face of the hygroscopic scintillation crystal through the, the first optical window and the first shell are in sealing bonding through epoxy sealant, and the second optical window and the second shell are in sealing bonding through epoxy sealant.
2. The hygroscopic scintillation crystal dual-permeable moisture-proof package structure of claim 1, wherein: the first positioning ring and the second positioning ring are made of polytetrafluoroethylene, the side face of the hygroscopic scintillation crystal wraps the reflecting layer and is fastened in a cavity formed by the positioning rings, and the first positioning ring is connected with the second positioning ring through matched threads.
3. The hygroscopic scintillation crystal dual-permeable moisture-proof package of claim 2, wherein: and chamfers are processed on the outer edges of the outer end faces of the first positioning ring and the second positioning ring and are matched with the chamfers at the inner bottom end of the shell.
4. The hygroscopic scintillation crystal dual-permeable moisture-proof package structure of claim 1, wherein: the end faces of the first positioning ring and the second positioning ring are respectively provided with an end face with a step higher than the hygroscopic scintillation crystal, and the first positioning ring, the second positioning ring and the hygroscopic scintillation crystal respectively form two circular grooves with the first end face and the second end face.
5. The hygroscopic scintillation crystal dual-permeable moisture-proof package of claim 4, wherein: the circular groove is used for accommodating optical coupling glue to control the thickness of the first optical coupling layer and the second optical coupling layer.
6. The hygroscopic scintillation crystal dual-permeable moisture-proof package structure of claim 1, wherein: the material of the light reflecting layer is a polytetrafluoroethylene film or an ESR reflecting film.
7. The hygroscopic scintillation crystal dual-permeable moisture-proof package structure of claim 1, wherein: the hygroscopic scintillation crystal is NaI Tl crystal, CsI Tl crystal and LaCl3Ce crystal and LaBr3Ce crystal, CeBr3Crystal, SrI2Eu crystal, Cs2LiYCl6One of the Ce crystals.
8. The hygroscopic scintillation crystal dual-permeable moisture-proof package structure of claim 1, wherein: the shell is made of one of stainless steel, titanium alloy, aluminum alloy and copper alloy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021000822.7U CN213210489U (en) | 2020-06-04 | 2020-06-04 | Moisture absorption scintillation crystal is two dampproofing packaging structure that passes through |
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| CN202021000822.7U CN213210489U (en) | 2020-06-04 | 2020-06-04 | Moisture absorption scintillation crystal is two dampproofing packaging structure that passes through |
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| CN213210489U true CN213210489U (en) | 2021-05-14 |
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| CN202021000822.7U Active CN213210489U (en) | 2020-06-04 | 2020-06-04 | Moisture absorption scintillation crystal is two dampproofing packaging structure that passes through |
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