CN204718774U - A kind of measurement mechanism of microchannel plate resolving power - Google Patents
A kind of measurement mechanism of microchannel plate resolving power Download PDFInfo
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- CN204718774U CN204718774U CN201520439225.7U CN201520439225U CN204718774U CN 204718774 U CN204718774 U CN 204718774U CN 201520439225 U CN201520439225 U CN 201520439225U CN 204718774 U CN204718774 U CN 204718774U
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Abstract
The utility model discloses a kind of measurement mechanism of microchannel plate resolving power, be mainly used in microchannel plate manufacturer and user measures its resolving power.Main technical schemes is: apparatus structure, in vacuum chamber, coordinate installation fixture, vacuum chamber is stamped a view window, on the top of view window, optical lens, ccd video camera are installed, ccd video camera is connected with computing machine, and the bottom of vacuum chamber connects vacuum pump, is connected with wire by stem with high-voltage power supply.The utility model passes through probationary certificate: filled up the blank that producer and user cannot measure microchannel plate resolving power, fundamentally eliminate because microchannel plate resolving power does not reach the phenomenon requiring the utility model to cause the related products such as gleam image intensifier in batch to scrap, reach the quality effectively improving and ensure that microchannel plate, adapt to the demand of modern production.
Description
Technical field
the utility model belongs to a kind of measurement mechanism to microchannel plate, specifically a kind of device measuring its resolving power for microchannel plate manufacturer and user.
Background technology
microchannel plate (being called for short MCP), it is a kind of large battle array microchannel, face electron-multiplier, see Fig. 1, it is by many hollow glass tubes 3, solid edge 1 and electrode 2 form, the diameter of glass tube is about φ 4 ~ 50 μm, and when the two ends of each root glass tube are added with certain operating voltage, they are just equivalent to the photomultiplier of a continuous dynode.MCP, as a kind of electron-multiplier, is used widely in relevant industries, and as applied as electron multiplication means in gleam image intensifier, the MCP in gleam image intensifier, except requiring to have except higher gain, also requires to have higher resolving power.Resolving power is one of the key technical indexes of MCP, and resolving power refers under given conditions, and the best result that MCP output electronic image demonstrates optical imagery on video screen distinguishes power (unit lp/mm).Identical in operating voltage, under the identical and distance the same terms between MCP output terminal and video screen of video screen, resolving power depends on the diameter phi of MCP passage, the factor (see figure 2)s such as width a, the degree of depth b of output electrode and electron scrubbing.At present when measuring the performance of MCP, because technical difficulty can not be measured the resolving power of MCP greatly, also not yet find both at home and abroad to measure the method for MCP resolving power or the report of device.
in practice, the manufacturer of MCP, all can be measured by test board performance index such as its gain, plate resistance, dark current, visual field cleanliness, to ensure that dispatched from the factory MCP reaches the requirement of performance index.Also be like this user of MCP, as in the application process of gleam image intensifier, when MCP is loaded after in image intensifier, before encapsulation photocathode is carried out to gleam image intensifier, also must test the performance index of MCP, otherwise after gleam image intensifier manufacture completes, then find that MCP has problem, so will produce pipe being scrapped, be common concern in this respect lesson industry.Owing to can not measure the resolving power of MCP, after gleam image intensifier manufacture completes, sometimes really belong to resolving power and do not reach requirement, cause gleam image intensifier in batch to be scrapped, the example causing tremendous economic to lose is not very rare.But resolving power do not reach requirement according to all can not find, reasoning from logic analysis have to look for reason from many aspects, but the reason found out is not objective after all directly draws, confidence level is poor.Sometimes the manufacturer of MCP and the quality dispute of gleam image intensifier manufacturer is also caused.Therefore being no matter the user that the manufacturer of MCP or gleam image intensifier etc. are produced, all in the urgent need to there being a kind of device can measuring MCP resolving power, solving this technical barrier long-standing in industry.
Utility model content
main task of the present utility model and object are, for the defect can not measured MCP resolving power existed at present, according to the theory of MCP, design a kind of measurement mechanism of MCP resolving power, MCP resolving power is measured by the method compared, fills up the blank that producer and user cannot measure MCP resolving power.Fundamentally eliminate because resolving power does not reach requirement, the phenomenon causing gleam image intensifier in batch and other related products to be scrapped, reaches the quality effectively improving and ensure MCP, adapts to the demand of modern production.
main technical schemes of the present utility model is: equipments overall structure, in vacuum chamber, place an insulating base, insulating base coordinates installation fixture, vacuum chamber is stamped a view window, has optical lens, ccd video camera on the top of view window by support installing, ccd video camera is connected with computing machine, the lower left quarter of vacuum chamber connects vacuum gauge, vacuum valve, turbomolecular pump, mechanical pump, and the right lower quadrant of vacuum chamber is equipped with stem, is connected with high-voltage power supply by wire.
the utility model passes through probationary certificate: reach development object completely, fill up the blank that producer and user cannot measure MCP resolving power, pick out underproof MCP, stop waste product to dispatch from the factory the phenomenon that waste product comes into operation, my company is as user, no longer occur the example that the gleam image intensifier after manufacturing completion is scrapped because the resolving power of MCP is defective, fundamentally improve and ensure that product quality, economical, societal benefits are improved significantly.
Accompanying drawing explanation
below in conjunction with accompanying drawing, the utility model is described in further detail.
fig. 1 is the shape and structure schematic diagram of MCP.
fig. 2 is the enlarged diagram that Fig. 1 marks A.
fig. 3, be MCP single passage in dark launch the Single Electron 4 produced, the schematic diagram of the dark transmitting speck 5 produced on video screen 28 after multiplication.
fig. 4 is structural representation of the present utility model.
fig. 5 is clamp structure schematic diagram of the present utility model, is also the installation diagram of MCP.
fig. 6, when being measurement standard MCP, the dark transmitting speck schematic diagram that video screen produces.
fig. 7, when being measurement No. 1 MCP to be measured, the dark transmitting speck schematic diagram that video screen produces.
fig. 8, when being measurement No. 2 MCP to be measured, the dark transmitting speck schematic diagram that video screen produces.
Embodiment
with reference to Fig. 4, main technical schemes of the present utility model is described: (namely the resolving power of the single passage of MCP is higher according to the theory of MCP for the utility model, the resolving power of MCP is higher, the resolving power of single passage is lower, the resolving power of MCP also decreases, therefore the resolving power height of the single passage of MCP also just represents the height of MCP resolving power, simultaneously the resolving power of the single passage of MCP again with it on video screen institute become the dark diameter launching speck to be inversely proportional to, speck is larger, the resolving power of the single passage of MCP is lower), devise a kind of comparison of MCP resolving power and the device of measurement.The utility model is by vacuum chamber 6, and upper cover 7, computing machine 8, ccd video camera 9, optical lens 10, view window 11, fixture 12, insulating base 13, vacuum valve 14, vacuum gauge 15, turbomolecular pump 16, mechanical pump 17, high-voltage power supply 18, stem 19 form.Equipments overall structure, in vacuum chamber 6, place an insulating base 13, insulating base coordinates installation fixture 12, the upper cover 7 of vacuum chamber has a view window 11, optical lens 10, ccd video camera 9 is had by support installing on the top of view window, ccd video camera is connected with computing machine 8, and the lower left quarter of vacuum chamber 6 connects vacuum gauge 15, vacuum valve 14, turbomolecular pump 16, mechanical pump 17, the right lower quadrant of vacuum chamber 6 is equipped with stem 19, is connected with high-voltage power supply 18 by wire;
with reference to Fig. 5, the concrete structure of fixture 12: on the top of fixture be one by glass sheet 27 assembly with sealing ring 29 sealing-in, one deck video screen 28 is manufactured with at the inside surface of glass sheet 27, short ceramic ring 20, middle ceramic ring 21, long ceramic ring 22 seal with mounting ring 23, installing ring 25 and sealing ring 29, and a removably split ring trim ring 24 is housed between mounting ring 23 and installing ring 25;
with reference to Fig. 4, the concrete operations (carrying out in the clean room manufacturing electron tube) of MCP resolution measurement: a, a selection reasonable gleam image intensifier using MCP as electron multiplication of all technical, common gleam image intensifier test board is measured its resolution force value R 0 standard value as MCP resolving power to be measured (is generally45lp/mm,
because the resolving power of gleam image intensifier depends primarily on the quality of MCP, other factor is little, can ignore), b, the MCP26 in gleam image intensifier is removed as standard MCP, load on the installing ring 25 in fixture 12 after clean, afterwards split ring trim ring 24 is arranged between MCP26 and mounting ring 23, MCP is fixed on installing ring 25, MCP is connected with mounting ring, installing ring (see figure 5) respectively, c, close the vacuum valve 14 of vacuum chamber 6, drying nitrogen is poured in vacuum chamber, when pressure in vacuum chamber reaches atmospheric pressure, open the upper cover 7 of vacuum chamber, to install the fixture 12 of MCP, put on the insulating base 13 of vacuum chamber, connect MCP26 input end mounting ring 23 respectively, the wire of output terminal installing ring 25 and video screen 28 output terminal sealing ring 29, cover the upper cover 7 of vacuum chamber, close nitrogen charging valve, open mechanical pump 17 in order, turbomolecular pump 16 and vacuum valve 14, vacuum chamber 6 is vacuumized, when reach capacity vacuum time, keep vacuumizing more than 1 hour, now vacuum tightness should be better than 10 -4 handkerchief, opens high-voltage power supply 18, slowly applies operating voltage to MCP 26 and video screen 28, ccd video camera 9 and optical lens 10 is adjusted directly over view window 11, opens the power supply of ccd video camera 9 and computing machine 8, on d, on the computer screen observation video screen 28, MCP secretly launches speck image (see figure 6), after MCP works 10 minutes, start to gather image (time shutter of CCD is set as 20ms), utilize the diameter of all specks of computer software measurement, and calculate mean value d 1 as the standard value of the dark transmitting speck diameter of MCP to be measured, (as φ 17.5, φ 18.2, φ 17.8, φ 17.9, φ 17.4, φ 17.5, mean diameter d 1 be 17.7), e, measure after, close vacuum valve 14, in vacuum chamber 6, pour drying nitrogen, when the pressure in vacuum chamber reaches atmospheric pressure, open vacuum chamber upper cover 7, take out fixture 12, unload standard MCP, f, program according to step b, c, d, e, measure the mean value d that five of MCP to be measured secretly launch speck diameters 2 , the resolving power R of g, MCP to be measured is according to formular=
d 1 / d 2 × R 0 calculate.
with reference to Fig. 4, the magnification of described CCD optical lens 10 is 5 times; Ccd video camera 9 model is EO-5023M, and CCD chip is Sony ICX655, and output interface is USB2.0; Video screen 28 is P20 type video screens of standard, and the distance between MCP26 output terminal and video screen 28 is that 0.8mm(is shown in Fig. 5); The input terminal voltage of MCP is zero, and output end voltage is 1200V, and screen voltage is 7200V.
with reference to Fig. 4, clamp body size of the present utility model can design according to the size specification of tested MCP, and therefore the utility model is not only applicable to a kind of MCP measurement of specification, and the MCP being applicable to the plurality of specifications such as φ 25mm, φ 18mm, φ 40mm measures.Not only be used in the measurement of monolithic MCP, be also applicable to the biplate of specification of the same race or the measurement of three.For the measurement of biplate, can load in fixture 12 by two panels MCP superposition, similar with the assembly method of monolithic, unlike voltage added when measuring, the input terminal voltage of MCP is zero, and output end voltage is 2000V, and screen voltage is 8000V.For the measurement of three, can load in fixture 12 by three MCP superpositions, similar with two panels stacking method, be zero unlike the input terminal voltage of MCP when measuring, output end voltage is 2400V, and screen voltage is 8400V.
embodiment one (see figure 7), by a MCP to be measured, external diameter φ 25mm, measures by above-mentioned steps b, c, d, e program the mean value d that five are secretly launched speck diameter
2
, (as φ 23.2, φ 22.7, φ 23.6, φ 22.6, φ 23.1, mean diameter d
2
for φ 23.04), standard value R0 is 45lp/mm, and the resolving power R of MCP to be measured, calculates R=17.7/23.04 × 45lp/mm=35lp/mm according to above formula, gleam image intensifier technical requirement 30lp/mm according to this kind of model is qualified, and the resolving power of this MCP is qualified.
embodiment two (see figure 8), by No. two MCP to be measured, external diameter φ 25mm, measures by above-mentioned steps b, c, d, e program the mean value d that five are secretly launched speck diameter
2
, (as φ 35.6, φ 35.6, φ 36.5, φ 37.1, φ 35.4, mean diameter d
2
for φ 36.04), standard value R0 is 45lp/mm, and the resolving power R of MCP to be measured, calculates R=17.7/36.04 × 45lp/mm=22.1lp/mm according to above formula, and the resolving power of this MCP is defective.
the whether qualified of resolving power be relative, depend primarily on the technical requirement of the product used for MCP, technical requirement is high, and this MCP may be defective, for technical requirement low may be qualified.
the utility model, also for the measurement of No. three, No. four, No. five MCP to be measured, secretly launches speck mean diameter d
2
be respectively with resolving power R: φ 24.05,33.11 lp/mm, φ 29.01,27.45 lp/mm, φ 28.02,28.42 lp/mm.As the technical requirement of general gleam image intensifier, these MCP should be qualified, many because measuring number, will not enumerate here.
the present invention is by producing the producer of MCP and the on probation, respond well of user.
Claims (2)
1. the measurement mechanism of a microchannel plate resolving power, it is characterized in that: equipments overall structure, in vacuum chamber (6), place an insulating base (13), insulating base coordinates installation fixture (12), the upper cover (7) of vacuum chamber has a view window (11), optical lens (10) is had by support installing on the top of view window, ccd video camera (9), ccd video camera is connected with computing machine (8), the lower left quarter of vacuum chamber (6) connects vacuum gauge (15), vacuum valve (14), turbomolecular pump (16), mechanical pump (17), the right lower quadrant of vacuum chamber (6) is equipped with stem (19), be connected with high-voltage power supply (18) by wire.
2. the measurement mechanism of microchannel plate resolving power according to claim 1, it is characterized in that: the concrete structure of fixture (12), it is an assembly by glass sheet (27) and sealing ring (29) sealing-in on the top of fixture, one deck video screen (28) is manufactured with at the inside surface of glass sheet (27), short ceramic ring (20), middle ceramic ring (21), long ceramic ring (22) and mounting ring (23), installing ring (25) and sealing ring (29) seal, a removably split ring trim ring (24) is housed between mounting ring (23) and installing ring (25).
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| CN201520439225.7U CN204718774U (en) | 2015-06-25 | 2015-06-25 | A kind of measurement mechanism of microchannel plate resolving power |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547686A (en) * | 2016-02-05 | 2016-05-04 | 中国科学院物理研究所 | Method for determining microfluid channel conductivity |
| CN109174698A (en) * | 2018-06-29 | 2019-01-11 | 北京无线电计量测试研究所 | A kind of microchannel plate test method and system |
-
2015
- 2015-06-25 CN CN201520439225.7U patent/CN204718774U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547686A (en) * | 2016-02-05 | 2016-05-04 | 中国科学院物理研究所 | Method for determining microfluid channel conductivity |
| CN109174698A (en) * | 2018-06-29 | 2019-01-11 | 北京无线电计量测试研究所 | A kind of microchannel plate test method and system |
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