CN207977293U - A kind of Trinity striped image converter tube group - Google Patents
A kind of Trinity striped image converter tube group Download PDFInfo
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- CN207977293U CN207977293U CN201820052683.9U CN201820052683U CN207977293U CN 207977293 U CN207977293 U CN 207977293U CN 201820052683 U CN201820052683 U CN 201820052683U CN 207977293 U CN207977293 U CN 207977293U
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- image converter
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Abstract
The utility model is related to a kind of Trinity striped image converter tube groups, including the first striped image converter tube, the second striped image converter tube, third striped image converter tube, first striped image converter tube, the second striped image converter tube, third striped image converter tube laid out in parallel and a shared fluorescent screen, first striped image converter tube, the second striped image converter tube, third striped image converter tube incidence end be located at homonymy, optical signal is tested for receiving, shares fluorescent screen for exporting visible light signal.By implementing the utility model, Trinity striped image converter tube group is the core component of X-ray streak camera cathode detecting system, according to the requirement of Theoretical Design and Project Realization, it takes into account and mutual restriction problem between the parameters such as balanced large working area product, small size, high voltage, optimization design striped image converter tube electron-optical system and electrode structure quickly detect while realizing X-ray streak camera photocathode.
Description
Technical field
The utility model is related to X-ray streak cameras, more specifically to a kind of Trinity striped image converter tube group.
Background technology
X-ray streak camera can be with imaging x-ray and ultraviolet signal, but commonly referred to as X-ray streak camera.X-ray
Streak camera is the important diagnostic instrument for obtaining the continuous change in time and space information of ultrafast X-ray/ultraviolet radiation, X-ray/ultraviolet light
The imaging research of ultrafast phenomena to natural science, clean energy resource, Material Physics, photo-biological, photochemistry, ultrashort laser technology, swash
The scientific researches such as optical physics, high-energy physics and technical field play an important roll.Especially Study of Laser driving inertial confinement is poly-
Implosion dynamics are obtained in change and information is compressed in implosion, obtain indispensable the examining of the continuous change in time and space image of plasma radiation
Disconnected instrument.
The photocathode of X-ray streak camera is converted into electronic impulse by opto-electronic conversion, ultrafast light pulse to be measured,
Electronic impulse carries optical pulse information in time, space and intensity, this is the first step of streak camera diagnosing image.It is common
There are golden (Au) and cesium iodide (CsI), both photocathodes all can be because of long-time, height in the photocathode of X-ray streak camera
The X-ray of intensity is bombarded and performance degradation or failure, though the quantum efficiency of especially CsI opto-electronic conversions is high, easily deliquesces crystallization,
Exposure several hours will fail under air environment.In addition the difference of cathode-making process, the size of thicknesses of layers, also influence
Camera imaging stability.With the increase of X-ray energy and intensity, the validity of periodic detection photocathode, screenability is steady
Fixed photocathode has importance and necessity.
Photocathode piece only can not obtain validity from visual inspection at present, and it is enterprising to attach it to X-ray streak camera
When row diagnosing image, it can just show whether photocathode is effective, and a large amount of photocathode piece can only check one by one.This method
Not only testing cost is high, and efficiency is low, and the image quality of different photocathode pieces can not compare in same width picture.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, provide three one a kind of
Body striped image converter tube group.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of Trinity striped image converter tube
Group, including the first striped image converter tube, the second striped image converter tube, third striped image converter tube, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube laid out in parallel, the first striped image converter tube, the second striped image converter tube, third striped become
As the incidence end of pipe is located at homonymy, for receiving test optical signal.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, the structure of third striped image converter tube are identical.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube includes light
Electric cathode, aperture plate, focusing electrode, anode and deflecting plates, wherein
The photocathode is removably mounted on the incidence end of the first striped image converter tube by cathode pedestal, is used for
Light pulse is converted into electronic impulse, the photocathode is parallel with the aperture plate；The focusing electrode is located at described first
The flight corridor and axial symmetry of line image converter tube are distributed；The anode is located at the flight corridor and axis pair of the first striped image converter tube
Claim distribution；The deflecting plates is located at exit end both sides of the first striped image converter tube and symmetrical.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube are located in vacuum chamber.
Preferably, Trinity striped image converter tube group described in the utility model has openable and closable the moon on the vacuum chamber
Window is replaced in pole, and the cathode replaces the aperture position and the first striped image converter tube, the second striped image converter tube, third striped of window
The incidence end of image converter tube corresponds to, and the cathode is replaced and provides operating space when window is opened to replace photocathode.
Preferably, Trinity striped image converter tube group described in the utility model, the vacuum chamber is close to described first
Line image converter tube, the second striped image converter tube, third striped image converter tube incidence end side be provided with dismountable vacuum slide valve, lead to
The vacuum slide valve is crossed to close the vacuum chamber.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube are fixed by upper clamp plate and lower clamp plate, and the lower clamp plate is fixed on the interior of the vacuum chamber
On wall.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube exit end be provided with and project electronic impulse and luminous fluorescence for receiving exit end
Screen, the fluorescent screen are the first striped image converter tube, the second striped image converter tube, the shared fluorescent screen of third striped image converter tube.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube are separately connected power supply；
The first striped image converter tube, the second striped image converter tube, third striped image converter tube are grounded by sharing grounding electrode.
Preferably, Trinity striped image converter tube group described in the utility model, the first striped image converter tube, Article 2
Line image converter tube, third striped image converter tube are separately connected power supply by high input voltage flange.
A kind of Trinity striped image converter tube group for implementing the utility model, has the advantages that：Including first
Line image converter tube, the second striped image converter tube, third striped image converter tube, the first striped image converter tube, the second striped image converter tube, third striped
Image converter tube laid out in parallel, the first striped image converter tube, the second striped image converter tube, third striped image converter tube incidence end be located at homonymy,
Optical signal is tested for receiving.By implementing the utility model, Trinity striped image converter tube group is X-ray streak camera cathode
The core component of detecting system, according to the requirement of Theoretical Design and Project Realization, take into account and balanced large working area product, small size,
Mutual restriction problem between the parameters such as high voltage, optimization design striped image converter tube electron-optical system and electrode structure realize X
It is quickly detected while ray streak camera photocathode.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is a kind of structural schematic diagram of X-ray streak camera photocathode rapid detection system of the utility model；
Fig. 2 is the structural schematic diagram of the utility model Trinity striped image converter tube group；
Fig. 3 is the cross-sectional view of the utility model the first striped image converter tube；
Fig. 4 is the test image of the utility model experiment；
Fig. 5 is the spatial resolution test image of the utility model experiment.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
Fig. 1 is a kind of structural schematic diagram of X-ray streak camera photocathode rapid detection system of the utility model.
Specifically, the X-ray streak camera photocathode rapid detection system includes light source 10, Trinity striped transshaping
Pipe group, CCD camera 302, power supply and computer 40, wherein light source 10 is arranged in Trinity striped image converter tube
The incident end side of group, the incidence end for the test optical signal directive Trinity striped image converter tube group that light source 10 is sent out.Preferably, light
Source 10 is X-ray source or ultraviolet source, and the present embodiment is detected explanation, the detection of X-ray by taking ultraviolet dish type lamp as an example
It can refer to execution.Trinity striped image converter tube group receives the test optical signal of input, generates test image.CCD camera 302
Exit end in Trinity striped image converter tube group is set, the test of the exit end for acquiring Trinity striped image converter tube group
Image.CCD camera 302 connects computer 40, and test image is transmitted to computer 40, and computer 40 is according to preset algorithm
Test image is handled, test result is obtained.
Power supply be used for for entire detecting system power, power supply be separately connected Trinity striped image converter tube group and
CCD camera 302, wherein the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 are separately connected
Power supply, the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 are by sharing grounding electrode
Ground connection.Preferably, the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 pass through high input voltage method
Orchid 503 is separately connected power supply.Further, power supply includes high voltage power supply 501 and divider 502, and high voltage power supply 501 is logical
It crosses divider 502 and is separately connected the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 and CCD
Video camera 302.
Fig. 2 is the structural schematic diagram of the utility model Trinity striped image converter tube group.
Specifically, Trinity striped image converter tube group includes the first striped image converter tube T1, the second striped image converter tube T2, third
Striped image converter tube T3, the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 laid out in parallel, first
Striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 incidence end be located at homonymy, for receiving test light
Signal.Preferably, the first striped image converter tube T1 in the present embodiment, the second striped image converter tube T2, third striped image converter tube T3
Structure is identical, to realize to being tested while three photocathodes, is intuitively compared experimental result, realizes three the moon
The image quality of pole compares in same width picture, improves testing efficiency.
Trinity striped image converter tube group is the core component of X-ray streak camera cathode detecting system, is set according to theory
The requirement of meter and Project Realization takes into account mutual restriction problem between the simultaneously parameters such as balanced large working area product, small size, high voltage,
Optimization design striped image converter tube electron-optical system and electrode structure.
Fig. 3 is the cross-sectional view of the utility model the first striped image converter tube.
Specifically, the first striped image converter tube T1 is seven electrode electrostatic focusing profile bar line image converter tubes, including photocathode 201
(P/C in figure), aperture plate M, focusing electrode F, anode A and deflecting plates DP, wherein photocathode 201 is removable by cathode pedestal
Be mounted on the incidence end of the first striped image converter tube T1 with unloading, for light pulse to be converted to electronic impulse, electronic impulse the time,
Optical pulse information is carried in space and intensity, this is the basis of streak camera diagnosing image.And ensure photocathode 201
It is strictly parallel between aperture plate M, realize that photoelectronic Proportional Acceleration Field is not destroyed.Focusing electrode F includes the first focusing electrode
Cylinder F1 and the second focusing electrode cylinder F2, the first focusing electrode cylinder F1 and the second focusing electrode cylinder F2 is located at the first striped image converter tube T1
Flight corridor and axial symmetry be distributed.Anode A includes first anode cylinder A1 and second plate cylinder A2, first anode cylinder A1 and
Two anode canister A2 are located at the flight corridor of the first striped image converter tube T1 and axial symmetry is distributed.First focusing electrode cylinder F1, second gather
Burnt electrode container F2, first anode cylinder A1 and second plate cylinder A2 are in be intervally arranged.Deflecting plates DP is located at the first striped image converter tube T1
Exit end both sides and symmetrical.In addition, existing shared grounding electrode between electrode, ensures each self-focusing and anode electrode
Property independent of one another, do not interfere with each other between electrostatic field.The exit end of first striped image converter tube T1 is directed at fluorescent screen 301 (in figure
P/S)。
Second striped image converter tube T2 and third striped image converter tube T3 are identical as the first striped image converter tube T1 structures, can refer to
One striped image converter tube T1, details are not described herein.
Further, mould is shelved using precision, keep each electrode not only hanging but also keeps accurate symmetrical structure.Preferably,
One striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 are fixed by upper clamp plate and lower clamp plate, above each
The contact conductor of electrode is introduced by upper clamp plate, and lower clamp plate is fixed on the inner wall of vacuum chamber 20.
In the present embodiment, the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 are located at true
In empty room 20, incidence of the vacuum chamber 20 close to the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3
End side is provided with the test optical signal input window 203 for testing optical signal entrance.In the non-test stage, vacuum chamber 20 is close
First striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 incidence end side be provided with removably
Vacuum slide valve 204 is closed vacuum chamber 20 by vacuum slide valve 204.In test phase, vacuum slide valve 204 is removed.
For more convenient quick replacement photocathode, there is openable and closable cathode to replace window 202, cathode on vacuum chamber 20
Replace the incidence of the aperture position and the first striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 of window 202
End corresponds to, and cathode is replaced and provides operating space when window 202 is opened to replace photocathode 201.Vacuum slide valve 204 is being closed,
It opens cathode and replaces window 202, three photocathodes 201 can be replaced easily and fast using cathode inserter tool.Can be realized every
From experiment target chamber, the quick-replaceable photocathode 201 in the case where not breaking test target chamber vacuum does not dismantle calibration system.It should
System structure is compact, and detection and quick-replaceable while three photocathodes may be implemented.
First striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3 exit end be provided with and be used for
It receives exit end and projects electronic impulse and luminous fluorescent screen 301, fluorescent screen 301 is the first striped image converter tube T1, the second striped
Image converter tube T2, third striped image converter tube T3 share fluorescent screen.CCD camera 302 is arranged in the side of fluorescent screen 301, for adopting
Collect the test image on fluorescent screen.Three striped image converter tubes share a fluorescent screen 301 and CCD camera 302, can save into
This reduction volume can also realize that the image quality of three cathodes compares in same width picture.
Vacuum chamber 20 further includes the vacuum meter 205 for measuring vacuum degree in vacuum chamber 20；Vacuum chamber 20, which is connected with, to be used for
Change the vacuum pump 206 of vacuum degree in vacuum chamber 20.Vacuum pump 206 connects divider 502 by high input voltage flange 503, point
Pressure 502 connects high voltage power supply 501, powers for vacuum pump 206.
Above system is tested below by way of experiment.
Photocathode detecting system test philosophy such as Fig. 1, light source 10 are ultraviolet dish type lamp.After starting test, by easamatic power brake
Plate valve 204 is changed to ultraviolet light input window, and the ultraviolet light of ultraviolet dish type lamp transmitting is radiated at three striped image converter tubes (first simultaneously
Striped image converter tube T1, the second striped image converter tube T2, third striped image converter tube T3) photocathode (Au cathodes) on.Photocathode
Emit photoelectron, accelerate and focus in three striped image converter tubes respectively, be imaged onto on the same fluorescent screen 301 be converted into it is visible
Light, and then by light-cone QCD sum rules digital signal is converted into CCD camera 302.201 glazing of photocathode is carved with graduation pattern,
Center 15lp/mm, both ends 10lp/mm can be demarcated and be examined by obtaining the digital picture of graduation pattern on photocathode 201
Survey the image quality of the validity and system of photocathode 201.
High voltage power supply and divider are used to provide stable DC high pressure to each electrode of striped image converter tube.Photocathode 201
Graduation pattern length be 30mm, 301 302 size of Φ 50mm, PI1300 type CCD cameras of fluorescent screen, 1300 × 1340 pixel, as
20 × 20 μm of plain size2Included 1.5:1 coupling light cone.
Photocathode detecting system test image such as Fig. 4, Trinity striped image converter tube group is in same width CCD video cameras 302
The striped picture of three length about 39mm is formed in image, striped picture is placed in 40.2 × 39mm2302 central area of CCD camera.
Striped picture is mutually non-overlapping and interference, the apparent bending of the nothing that is integrally mutually parallel, striped are slightly wider than right side, T2 stripeds on the left of spacing
(the second striped image converter tube T2 imagings) completely in 301 imaging region of fluorescent screen, T1 stripeds (the first striped image converter tube T1 institutes at
Picture) with T3 stripeds (third striped image converter tube T3 imagings) as upper end slightly exceed imaging region, resolution ratio pattern region entirety
Clearly.Test result confirms the validity of three photocathodes 201.
Three stripe pattern centers are respectively 619,656,621 pixels in the position of slit direction, 37 pixel of maximum deviation,
The then peak excursion rate δ of slit direction imageyFor：
Same method can obtain the deviation ratio 6.6% perpendicular to slit direction image, data such as table 1.
1 image shift rate test data of table
3mm area of the pattern among T1 images, starting point and end point are 480,688 pixels, and length is 128 pixels, light cone times
Rate 1.5:1, then striped is as enlargement ratio M1For：
Striped image converter tube T1 enlargement ratios be 1.28, same method can measure T2, T3 enlargement ratio be 1.29,
1.29.System magnification test data such as table 2.Three striped image converter tube imaging enlargement ratio errors are up to 0.8%, system
Enlargement ratio has preferable consistency.
2 system magnification test data of table
| Parameter | T1 stripeds | T2 stripeds | T3 stripeds |
| Fringe position/pixel | 480 | 517 | 484 |
| Striped upright position/pixel | 688 | 646 | 612 |
| Length/pixel | 128 | 129 | 128 |
| Enlargement ratio | 1.28 | 1.29 | 1.29 |
The results are shown in Figure 5 for the 10lp/mm resolution tests of T1, T2, T3 stripe pattern edge, and three stripe pictures can be seen
To light and dark resolution ratio pattern, T2 stripeds are the most clear, followed by T1 stripeds and T3 stripeds, by the gray scale of bright and dark pattern
Value can calculate the contrast of image.
T1 striped light and shade striped maximum values Imax10547.33 minimum value Imin8619.47 background intensity 1921.6, therefore
Contrast is C：
Same method can show that T2 stripeds and T3 fringe contrasts are 0.29 and 0.06,10lp/mm image in different resolution pair
Table 3 for example than degrees of data.
3 spatial resolution image contrast of table
It can be seen that being up to 0.29, T1 stripeds, the comparison of T3 stripe patterns positioned at center T2 stripe pattern contrasts in table
Degree is less than T2, the discrimination standard still above 0.05.The spatial resolution of detecting system reaches 10lp/mm.The result proves
201 rapid detection system of set X-ray streak camera photocathode, while detecting three photocathodes 201, three stripe pictures
It is uniformly distributed, spatial resolution reaches 10lp/mm.
By implementing the utility model, by adjusting voltage, structure and the relative position of Trinity striped image converter tube group,
Three slits are imaged on the detectable central area of CCD camera simultaneously, realize fast while X-ray streak camera photocathode
Speed detection.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should all belong to the utility model claims covers model
It encloses.
Claims (10)
1. a kind of Trinity striped image converter tube group, which is characterized in that including the first striped image converter tube (T1), the second striped transshaping
Manage (T2), third striped image converter tube (T3), the first striped image converter tube (T1), the second striped image converter tube (T2), third striped
Image converter tube (T3) laid out in parallel, the first striped image converter tube (T1), the second striped image converter tube (T2), third striped image converter tube
(T3) incidence end is located at homonymy, for receiving test optical signal.
2. Trinity striped image converter tube group according to claim 1, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), the structure of third striped image converter tube (T3) are identical.
3. Trinity striped image converter tube group according to claim 2, which is characterized in that the first striped image converter tube
(T1) include photocathode (201), aperture plate (M), focusing electrode (F), anode (A) and deflecting plates (DP), wherein
The photocathode (201) is removably mounted on the incidence of the first striped image converter tube (T1) by cathode pedestal
End, for light pulse to be converted to electronic impulse, the photocathode (201) is parallel with the aperture plate (M)；The focusing electrode
(F) flight corridor and axial symmetry for being located at the first striped image converter tube (T1) are distributed；The anode (A) is located at described first
The flight corridor and axial symmetry of line image converter tube (T1) are distributed；The deflecting plates (DP) is located at the first striped image converter tube (T1)
Exit end flight corridor both sides and symmetrical.
4. Trinity striped image converter tube group according to claim 1, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), third striped image converter tube (T3) are located in vacuum chamber (20).
5. Trinity striped image converter tube group according to claim 4, which is characterized in that having on the vacuum chamber (20) can
The cathode replacement window (202) of folding, the aperture position of the cathode replacement window (202) and the first striped image converter tube (T1),
The incidence end correspondence of second striped image converter tube (T2), third striped image converter tube (T3), the cathode, which is replaced when window (202) is opened, is
It replaces photocathode (201) and operating space is provided.
6. Trinity striped image converter tube group according to claim 4, which is characterized in that the vacuum chamber (20) is close to institute
State the first striped image converter tube (T1), the second striped image converter tube (T2), third striped image converter tube (T3) incidence end side be provided with
Dismountable vacuum slide valve (204) is closed the vacuum chamber (20) by the vacuum slide valve (204).
7. Trinity striped image converter tube group according to claim 4, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), third striped image converter tube (T3) are fixed by upper clamp plate and lower clamp plate, and the lower clamp plate is solid
It is scheduled on the inner wall of the vacuum chamber (20).
8. Trinity striped image converter tube group according to claim 4, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), third striped image converter tube (T3) exit end be provided with for receive exit end project electricity
Subpulse and luminous fluorescent screen (301), the fluorescent screen (301) are the first striped image converter tube (T1), the change of the second striped
As pipe (T2), third striped image converter tube (T3) share fluorescent screen (301).
9. Trinity striped image converter tube group according to claim 1, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), third striped image converter tube (T3) are separately connected power supply (50)；
The first striped image converter tube (T1), the second striped image converter tube (T2), third striped image converter tube (T3) are by sharing ground connection
Electrode is grounded.
10. Trinity striped image converter tube group according to claim 9, which is characterized in that the first striped image converter tube
(T1), the second striped image converter tube (T2), third striped image converter tube (T3) are separately connected power supply electricity by high input voltage flange (503)
Source (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820052683.9U CN207977293U (en) | 2018-01-12 | 2018-01-12 | A kind of Trinity striped image converter tube group |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820052683.9U CN207977293U (en) | 2018-01-12 | 2018-01-12 | A kind of Trinity striped image converter tube group |
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| Publication Number | Publication Date |
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| CN207977293U true CN207977293U (en) | 2018-10-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108198739A (en) * | 2018-01-12 | 2018-06-22 | 深圳大学 | A kind of Trinity striped image converter tube group |
| WO2019137096A1 (en) * | 2018-01-12 | 2019-07-18 | 深圳大学 | Quick detection system for photoelectric cathode of x-ray streak camera |
-
2018
- 2018-01-12 CN CN201820052683.9U patent/CN207977293U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108198739A (en) * | 2018-01-12 | 2018-06-22 | 深圳大学 | A kind of Trinity striped image converter tube group |
| WO2019137095A1 (en) * | 2018-01-12 | 2019-07-18 | 深圳大学 | Triune streak image converter tube group |
| WO2019137096A1 (en) * | 2018-01-12 | 2019-07-18 | 深圳大学 | Quick detection system for photoelectric cathode of x-ray streak camera |
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Granted publication date: 20181016 Effective date of abandoning: 20190809 |
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