CN102110575A - Photomultiplier installation protection structure - Google Patents
Photomultiplier installation protection structure Download PDFInfo
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- CN102110575A CN102110575A CN 201110043438 CN201110043438A CN102110575A CN 102110575 A CN102110575 A CN 102110575A CN 201110043438 CN201110043438 CN 201110043438 CN 201110043438 A CN201110043438 A CN 201110043438A CN 102110575 A CN102110575 A CN 102110575A
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- photomultiplier
- upper casing
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- clamp sleeve
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Abstract
The invention discloses a photomultiplier installation protection structure. The structure has the following beneficial effects: a rubber clamp sleeve is sleeved on a tail tube of a photomultiplier, and a metal shell is added to the outside the rubber clamp sleeve to apply certain pre-tightening force to the rubber clamp sleeve, so that the photomultiplier can be tightly wrapped up and can not radially drift; a clamp slot is arranged in the rubber clamp sleeve and a ceramic substrate of the photomultiplier is clamped in the clamp slot, thus solving the problem of axial drifting of the photomultiplier; therefore, the photomultiplier is hard to damage due to vibration; besides, the whole photomultiplier is hermetically put in the metal shell, thus avoiding the possible impact of hard light irradiation on the photomultiplier; in terms of installation, a through slot is arranged at one side of the rubber clamp sleeve and a slot with middle parts connected is arranged at the opposite side of the rubber clamp sleeve, so that the two parts of the clamp sleeve are incompletely disconnected, when the photomultiplier is put in the clamp sleeve, the two parts of the clamp sleeve are disconnected along the through slot and the tail tube of the photomultiplier is put in the inner cavity of the clamp sleeve, and the operations are very convenient; and the structure is simple and packaging process is simple and convenient, effects are good.
Description
Technical field
The present invention relates to the sniffer field of X imaging system, particularly relate to a kind of photomultiplier the protection structure is installed.
Background technology
Photomultiplier is a kind of vacuum device, and it is made up of photo-emissive cathode (photocathode) and focusing electrode, dynode and electron collector (anode) etc.Typical photomultiplier can be divided into two types of end-window and side window types by incident auroral poles receive mode.End window photomultiplier efficient compares higher.Its groundwork process is as follows:
When illumination was mapped to photocathode, photocathode inspired photoelectron in vacuum.These photoelectrons enter dynode system by focusing electric field, and obtain the multiplication amplification by further Secondary Emission.Electronics after the amplification is collected by electron collector and is exported as signal.
Because adopted the Secondary Emission dynode system, so photomultiplier in the photodetector of detecting x-ray radiation energy, has high sensitivity and extremely low noise.In addition, photomultiplier also has advantages such as response is quick, cost is low, cathode area is big.At present, many to the research of photomultiplier aspect of performance, but the few of concern protected in the installation of photomultiplier, in fact, the installation of photomultiplier protection is also very important for its use.
The encapsulation tail pipe of photomultiplier is subjected to external force or vibration easily and damages.The synthetic quartz shell photomultiplier that particularly has transition encapsulation more is subject to external impacts and mechanical oscillation and damages.
Simultaneously, when sunlight or other strong illuminations during to photomultiplier, the photocathode in the damage pipe easily also.So when photomultiplier is deposited, should not be exposed in the high light.
As from the foregoing, the installation protection for photomultiplier should have the higher requirement of ratio.Especially when installing space was restricted, fixedly photomultiplier was difficult to, as easy as rolling off a log fragmentation and the light leak that causes shell.Under this situation, it is more necessary that photomultiplier is installed protection.
In the prior art, the installation of photomultiplier protection mostly is rubber blanket on the tail pipe external cladding, or puts rubber ring, sealing ring etc., belong to local damping, protect effect bad.When protective devices such as cover rubber ring or sealing ring, be to enter from photomultiplier tail end cover, inconvenient operation.
Summary of the invention
Technical problem to be solved by this invention is that photomultiplier is vibrated easy damaged; can not be subjected in the characteristics of strong illumination and the prior art on the high side to the photomultiplier performance study; it is on the low side to protection research is installed; it is bad that the protection effect is installed; operation inconvenience and protection has proposed a kind of photomultiplier to the use of photomultiplier very important problem installation protection structure is installed; this structure can well be protected photomultiplier; make its can because of the vibration damaged; also can not be subjected to the influence of strong illumination; simultaneously do not influence installation again, install easily.
The photomultiplier that uses on the X-ray detector is a kind of end-window glass shell multiplier tube, does not pass through the encapsulation of any mechanical aspects when this pipe dispatches from the factory, and is commonly called as naked pipe.Introduce us and know by top, multiplier tube can not can not be squeezed by strong illumination, vibration etc.Photomultiplier is in use played a role preferably, must carry out reliable and stable protection it.
The technical problem that the present invention requires to solve can be achieved through the following technical solutions:
A kind of photomultiplier is installed the protection structure, comprises upper casing, lower casing, rubber cutting ferrule, over cap; Described upper casing is a circular cylindrical cavity, and the external diameter of interlude is greater than the two ends external diameter, and described upper casing one end face has the hole of diameter less than the upper casing internal diameter, and the other end bore dia equals the upper casing internal diameter; Described lower casing is the circular cylindrical cavity of a termination external diameter greater than the remainder external diameter, this termination internal diameter that external diameter is big is corresponding to the remainder internal diameter, the described lower casing other end has shoulder hole, in the less cavity of lower casing diameter, nearly mid point and near there being this end place of shoulder hole that one dividing plate is arranged, described dividing plate center has the hole of diameter less than the place cavity diameter; Described rubber cutting ferrule is a circular cylindrical cavity, is provided with draw-in groove near an end place in the cavity, and the other end is provided with location notch, and described rubber cutting ferrule one side-walls has been opened groove, and relative opposite side also has groove, and the mid portion of groove links to each other; Described rubber card is placed in one section cavity of this big end of lower casing dividing plate and external diameter, and the one end withstands on an end face of upper casing, and the other end withstands on an end face of lower casing dividing plate, and last lower house closely connects, and described over cap covers at the upper casing other end.
Described upper casing has on the end excircle of small diameter bore screw thread is arranged, and on big this end inwall of described lower casing external diameter screw thread is arranged also, the threaded engagement on this screw thread and the upper casing, and last lower house closely connects by screwing this two places screw thread.
Described over cap covers a end at upper casing by thread connecting mode.
The rubber cutting ferrule adopts silicon rubber, and silicon rubber has certain elasticity, and its deflection radially is related with suffered external pressure, specifically formula as follows: δ r=-pr
2 2/ E (r
2 2-r
1 2) * ［ (1-μ) r+ (1+ μ) r
1 2/ r ］, wherein:
Δ r---radial displacement (m)
P---interior pressure (Pa)
E---modulus of elasticity (G Pa)
r
1---barrel bore (m)
Calculate radial displacement place radius (m) in r---the cylinder
r
2---outside diameter of cylinder (m)
μ---Poisson's ratio
Utilize the deformation characteristics of silicon rubber, the outside adds a metal shell and applies certain pretightning force to it, multiplier tube will be encapsulated in the metal shell, like this pipe play radially not just.In addition, silicon rubber cutting ferrule inner chamber has a groove, and the base of ceramic of multiplier tube is stuck in this groove, has just solved the problem of pipe axial endplay.By said structure, effectively solved photomultiplier and vibrated flimsy problem.Because whole multiplier tube places in the metal shell, the whole shell of photomultiplier is all played a protective role, unlike localised protection just in the prior art; Avoided simultaneously photomultiplier to be subjected to the problem of strong illumination damage again.Another key characteristic of this structure is that the rubber cutting ferrule is convenient to install, and it is unlike the cutting ferrule of routine, and majority is annular; pack into from protected part one end; but along narrow slit of axial incision of cutting ferrule one side, only need when laying break into two with one's hands along this seam, pipe is lain in the inner chamber of cutting ferrule.Lay very conveniently, and have good positioning function.
Description of drawings
Fig. 1 installs the protection overall pattern for photomultiplier.
Fig. 2 is that the A of overall pattern shown in Figure 1 is to cutaway view.
Fig. 3 is a photomultiplier external structure schematic diagram.
Fig. 4 is a silicon rubber cutting ferrule front view.
Fig. 5 is a silicon rubber cutting ferrule end view.
Fig. 6 is a silicon rubber cutting ferrule cutaway view.
Fig. 7 is the upper casing front view.
Fig. 8 is that the B of upper casing front view shown in Figure 7 is to cutaway view.
Fig. 9 is the lower casing front view.
Figure 10 is that the C of lower casing front view shown in Figure 8 is to cutaway view.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
The installation protection structure of whole photomultiplier is seen accompanying drawing 1 and accompanying drawing 2, the protection structure is installed comprises upper casing 1, lower casing 2, silicon rubber cutting ferrule 3, over cap 4.
The structure of photomultiplier is seen accompanying drawing 3.
The profile of silicon rubber cutting ferrule 3 and structure are seen accompanying drawing 4, accompanying drawing 5, accompanying drawing 6; silicon rubber cutting ferrule 3 is designed to a columniform cavity; draw-in groove 31 and location notch 32 are arranged in the cavity; be used for protection and spacing photomultiplier; for the ease of placing, a side has been opened groove 33 on the protective sleeve, the groove 34 that has fraction to link to each other in the middle of opposite side has; make two parts not exclusively disconnect, not painstaking when breaking the placement photomultiplier into two with one's hands like this.
The profile of upper casing 1 and structure are seen accompanying drawing 7 and accompanying drawing 8, the end that the photomultiplier diameter is relatively little is that an end of 82 puts in from upper casing 1 aperture during encapsulation, and be that an end of 62 stretches out from the aperture, it is this end of 82 that the other end that the photomultiplier diameter is big stretches out upper casing 1 aperture.A side that silicon rubber cutting ferrule 3 is had groove is broken into two with one's hands then, photomultiplier is placed in the silicon rubber cutting ferrule inner chamber from this section that upper casing 1 stretches out, and make the base of ceramic 5 of photomultiplier be positioned at draw-in groove 31, the aperture that one end of silicon rubber cutting ferrule 3 withstands on upper casing 1 is this end face of 62, plays the effect of location.
The profile of lower casing 2 and structure are seen accompanying drawing 9 and accompanying drawing 10, the silicon rubber cutting ferrule 3 that said fixing is good puts in from this head of lower casing 2 slightly larger in diameter, the other end of silicon rubber cutting ferrule 3 withstands on dividing plate 21 end faces of lower casing 2, the screw thread of upper casing 1 with lower casing 2 screwed mutually, utilize the plastic deformation of silicon rubber and the pretightning force of metal shell, will be with photomultiplier wrapping tightly.
Over cap 4 being covered in upper casing 1 aperture at last is this side end of 82.Over cap 4 is by being threaded in an end of upper casing 1.When needs use photomultiplier, over cap 4 is backed out, again photomultiplier is screwed on the housing of detector and gets final product.Each parts of encapsulating structure closely connect, and light can not enter inside, when preventing that photomultiplier can be because of vibration damage, avoided again rayed the damage that may cause.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. a photomultiplier is installed the protection structure, it is characterized in that, comprises upper casing, lower casing, rubber cutting ferrule, over cap;
Described upper casing is a circular cylindrical cavity, and the external diameter of interlude is greater than the two ends external diameter, and one end has the hole of diameter less than the upper casing internal diameter, and the other end bore dia equals the upper casing internal diameter;
Described lower casing is the circular cylindrical cavity of a termination external diameter greater than the remainder external diameter, this termination internal diameter that external diameter is big is corresponding to the remainder internal diameter, the lower casing other end has shoulder hole, in the less cavity of lower casing diameter, nearly mid point and near there being this end place of shoulder hole that one dividing plate is arranged, described dividing plate center has the hole of diameter less than the place cavity diameter;
Described rubber cutting ferrule is a circular cylindrical cavity, is provided with draw-in groove near an end place in the cavity, and the other end is provided with location notch, and rubber cutting ferrule one side-walls has been opened groove, and relative opposite side also has groove, and the mid portion of groove links to each other;
Described rubber card is placed in one section cavity of this big end of lower casing dividing plate and external diameter, and the one end withstands on an end face of upper casing, and the other end withstands on an end face of lower casing dividing plate, and last lower house closely connects, and described over cap covers at the upper casing other end.
2. photomultiplier as claimed in claim 1 is installed the protection structure; it is characterized in that; described upper casing has on the end excircle of small diameter bore screw thread is arranged; on big this end inwall of described lower casing external diameter screw thread is arranged also; threaded engagement on this screw thread and the upper casing, last lower house closely connects by screwing this two places screw thread.
3. photomultiplier as claimed in claim 1 or 2 is installed the protection structure, it is characterized in that, described over cap covers a end at upper casing by thread connecting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100434384A CN102110575B (en) | 2011-02-23 | 2011-02-23 | Photomultiplier installation protection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100434384A CN102110575B (en) | 2011-02-23 | 2011-02-23 | Photomultiplier installation protection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102110575A true CN102110575A (en) | 2011-06-29 |
| CN102110575B CN102110575B (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100434384A Expired - Fee Related CN102110575B (en) | 2011-02-23 | 2011-02-23 | Photomultiplier installation protection structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319214A (en) * | 2014-09-30 | 2015-01-28 | 北京空间机电研究所 | Packaging method of anti-vibration type photoelectric detector |
| WO2019104902A1 (en) * | 2017-11-29 | 2019-06-06 | 苏州绿磁精密仪器有限公司 | Sealing clamp for scintillation detector |
| CN110265281A (en) * | 2019-06-12 | 2019-09-20 | 中国科学院高能物理研究所 | A kind of waterproof enclosure of the photomultiplier tube based on microchannel plate structure |
| CN110310879A (en) * | 2019-06-12 | 2019-10-08 | 中国科学院高能物理研究所 | The waterproof enclosure of dynode photomultiplier tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632539A (en) * | 2004-12-24 | 2005-06-29 | 北京源德生物医学工程有限公司 | Photoelectric detection device for single photon counter |
| US20060164007A1 (en) * | 2005-01-25 | 2006-07-27 | Kimitsugu Nakamura | Electron multiplier unit and photomultiplier including the same |
-
2011
- 2011-02-23 CN CN2011100434384A patent/CN102110575B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632539A (en) * | 2004-12-24 | 2005-06-29 | 北京源德生物医学工程有限公司 | Photoelectric detection device for single photon counter |
| US20060164007A1 (en) * | 2005-01-25 | 2006-07-27 | Kimitsugu Nakamura | Electron multiplier unit and photomultiplier including the same |
Non-Patent Citations (1)
| Title |
|---|
| 《物理实验》 19891031 罗售余 两种简便的光电倍增管管套与接口的设计制作 223-225 1-3 第9卷, 第5期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319214A (en) * | 2014-09-30 | 2015-01-28 | 北京空间机电研究所 | Packaging method of anti-vibration type photoelectric detector |
| CN104319214B (en) * | 2014-09-30 | 2017-04-26 | 北京空间机电研究所 | Packaging method of anti-vibration type photoelectric detector |
| WO2019104902A1 (en) * | 2017-11-29 | 2019-06-06 | 苏州绿磁精密仪器有限公司 | Sealing clamp for scintillation detector |
| CN110265281A (en) * | 2019-06-12 | 2019-09-20 | 中国科学院高能物理研究所 | A kind of waterproof enclosure of the photomultiplier tube based on microchannel plate structure |
| CN110310879A (en) * | 2019-06-12 | 2019-10-08 | 中国科学院高能物理研究所 | The waterproof enclosure of dynode photomultiplier tube |
| CN110310879B (en) * | 2019-06-12 | 2020-07-17 | 中国科学院高能物理研究所 | Waterproof encapsulation of dynode photomultiplier |
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| Publication number | Publication date |
|---|---|
| CN102110575B (en) | 2012-07-04 |
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