CN110095785A - From triggering strobed laser imaging device - Google Patents
From triggering strobed laser imaging device Download PDFInfo
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- CN110095785A CN110095785A CN201910341793.6A CN201910341793A CN110095785A CN 110095785 A CN110095785 A CN 110095785A CN 201910341793 A CN201910341793 A CN 201910341793A CN 110095785 A CN110095785 A CN 110095785A
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- microchannel plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
Abstract
Belong to Laser active illuminated imaging detection technology field from triggering strobed laser imaging device.The imaging detection signal-to-noise ratio of the prior art is to be improved.Microwell array grid its design feature in the present invention are as follows: along axial densely covered micron order through-hole in circular sheet shape glass matrix, all through-holes are in parallel and with the glass matrix axis at 7~15 ° of angles, in glass matrix top surface metal-plated membrane as trigger signal bypass electrode；The bottom surface of microwell array grid is contacted with the incident end face of second level microchannel plate；The trigger signal input terminal of trigger signal bypass electrode contact Power Generation Road, the gating signal output end of trigger circuit is connect with the pulse power, the respective gating signal input terminal of control circuit respectively, two electrode tips of the pulse power connect the incident end face electrode of the outgoing end electrode and second level microchannel plate of level-one microchannel plate respectively, and 50~100V backward voltage or 200~250V forward voltage are added between two electrodes；The electronic shutter of video camera is led in the driving signal output end selecting of control circuit.
Description
Technical field
The present invention relates to a kind of from triggering strobed laser imaging device, belongs to Laser active illuminated imaging detection technology field.
Background technique
Existing range gating Laser active illuminated imaging Detection Techniques are that infrared short-pulse laser, warp are issued by laser imaging light source
Beam splitting after collimation is reflected as detection image signal by target after a branch of illumination target and images in gating video camera；Another beam
External trigger source is reflected as by target after illumination target and is received by external trigger device (such as APD), as delay benchmark arteries and veins
Punching；The delay time that synchronous control circuit is determined according to the distance between laser imaging light source to target, according to imaging detection scape
The deep duration for determining storbing gate and opening, in gating moment, the detection image signal is just into gating video camera gating
Imaging, remaining time gate are closed.The program effectively removes non-pulse imaging time background miscellaneous light and enters gating video camera, mentions
High imaging detection signal-to-noise ratio.The light splitting scheme that only program is taken makes a part of laser and is not used for being imaged, and certainly will reduce
Detection image signal light power is unfavorable for the raising of imaging detection signal-to-noise ratio.
Summary of the invention
In order to further increase strobed laser Active Imaging detection signal-to-noise ratio, we have invented a kind of from triggering strobed laser
Imaging device is equivalent to a kind of electrovacuum amplifying device, still, a kind of automatically controlled gating device especially set out, i.e. microwell array grid
Microwell array grid are triggered as trigger signal in pole, the part for having already passed through the picture signal once amplified by its bypass in turn
Pole gating amplifies once again after the picture signal once amplified is by microwell array grid, finally images in gating camera shooting
Machine.
The strobed laser imaging device of triggering certainly of the present invention is it is characterized in that, as shown in Figure 1, glass window 1 is plugged in absolutely
2 one end of edge shell, from the end inside insulation shell 2 successively mosaic photocathode 3, level-one microchannel plate 4, microwell array grid
5, second level microchannel plate 6, fluorescent screen 7 are plugged in 2 other end of insulation shell, fluorescent screen 7 go out light side successively connect optical fiber cone 8,
Gate video camera 9；Its design feature of microwell array grid 5 are as follows: as shown in Fig. 2, along axial direction in circular sheet shape glass matrix
Gather micron order through-hole 10, all through-holes 10 it is parallel and with the glass matrix axis at 7~15 ° of angles, in the glass matrix
Top surface metal-plated membrane is as trigger signal bypass electrode 11；The bottom surface of microwell array grid 5 and the incidence of second level microchannel plate 6
End face contact；Trigger signal bypass electrode 11 contacts the trigger signal input terminal of Power Generation Road, the gating signal output of trigger circuit
End is connect with the pulse power, the respective gating signal input terminal of control circuit respectively, and two electrode tips of the pulse power connect respectively
The incident end face electrode of the outgoing end electrode and second level microchannel plate 6 of level-one microchannel plate 4, is added between two electrodes
50~100V backward voltage or 200~250V forward voltage；Video camera 9 is led in the driving signal output end selecting of control circuit
Electronic shutter.
The present invention's is as described below from triggering its gated imaging process of strobed laser imaging device.
Pulsed infrared laser irradiates target and background back reflection, and the optical detection image incidence of generation triggers strobed laser certainly
Imaging device focuses on photocathode 3 through glass window 1, and excitation generates photoelectron, forms electron beam image, adds just outer
Incident level-one microchannel plate 4 enhances image under to electric field action；Under normal conditions, outgoing of the pulse power in level-one microchannel plate 4
50~100V backward voltage is added between end electrode and the incident end face electrode of second level microchannel plate 6, when from level-one microchannel
The electron beam image that plate 4 is emitted is in time between two laser pulses, and electron beam image at this time is actually corresponding
Background din-light image, though obtain level-one microchannel plate 4 enhancing, it is still weaker, will be prevented by the backward voltage, perhaps this
When electron beam image it is stronger, fall in the trigger signal bypass electrode 11 of microwell array grid 5, generate electric current and as triggering
Signal flow trigger circuit；Before at one, specifically detection project is carried out, according to the actual detection in terms of target, background
Condition has been preset a current threshold for trigger circuit adjustment, has been generated by electron beam image corresponding with background din-light image
Electric current is less than the current threshold, and trigger circuit does not export gating signal, and background din-light image is thoroughly prevented；When micro- from level-one
The electron beam image that channel plate 4 is emitted is in laser pulse in time, although electron beam image at this time is still in reversely
Under voltage, constitute electron beam image electronics in a part have larger kinetic energy, reach trigger signal bypass electrode 11 and to
Trigger circuit inputs trigger current, which is greater than preset current threshold, then trigger circuit output and laser pulse
The identical gating signal of duration；After the pulse power receives gating signal, the backward voltage of output is instantaneously converted into 200~250V
Forward voltage so that electron beam image at this time is amplified normal through microwell array grid 5 by second level microchannel plate 6 again,
It under the effect of positive high pressure, is transmitted on fluorescent screen 7, and be reduced to optical imagery, gating camera shooting is coupled to by optical fiber cone 8
Machine 9；The normality for gating the electronic shutter of video camera 9 is to close, and control circuit receives the gating signal of the trigger circuit output
Afterwards, it is exported by delay process as driving signal and gives gating video camera 9, drive its electronic shutter to open, by gating video camera 9
Absorb the optical imagery.
The present invention it has technical effect that, using a part of laser acquisition image signal energy, believes as triggering
Number, meanwhile, a kind of automatically controlled gating device especially set out, i.e. microwell array grid 5, receive the touching for reaching threshold current in invention
It signals, trigger circuit then sends gating signal to the pulse power, and the pulse power then controls choosing in a manner of changing voltage direction
The logical and pass of logical device, here it is so-called " from triggering ".Reverse voltage restraint is within the scope of 50~100V, so that being no more than
40% electron beam image energy is bypassed as trigger signal, in addition the electron beam image also have passed through primary increasing before this
By force, still more there are also secondary beneficiating process for the reservation part of electron beam image.This gated fashion also brings a subsidiary effect,
That is exactly to gate dynamic effect to be improved, this is because gating process is completed in the link extremely concentrated at one.It is practical
On, the present invention also using the electronic shutter in gating video camera 9 and then time delay secondary gating, further increases laser acquisition image
The signal-to-noise ratio of signal.
Detailed description of the invention
Fig. 1 is the present invention from triggering strobed laser image device structure schematic diagram, which is used as Figure of abstract simultaneously.Figure
2 be the microwell array gate structure partial enlargement schematic cross-sectional view in the strobed laser imaging device of triggering certainly of the present invention.
Specific embodiment
The present invention's is as shown in Figure 1 from triggering strobed laser imaging device.
Glass window 1 is plugged in 2 one end of insulation shell, and 1 material of glass window is glass for infrared rays.
From the end inside insulation shell 2 successively mosaic photocathode 3, level-one microchannel plate 4, microwell array grid 5, two
Grade microchannel plate 6, fluorescent screen 7 are plugged in 2 other end of insulation shell, and fluorescent screen 7 goes out light side and successively connects optical fiber cone 8, gating
Video camera 9.
The photocathode 3 is a kind of GaAs photocathode with a thickness of 5mm, diameter 25mm.
The level-one microchannel plate 4,6 diameter of second level microchannel plate are 27mm, and effective aperture 18.4mm, channel aperture is
20 μm, access opening is away from being 8 μm, with a thickness of 0.3mm, draw ratio 15.
Its design feature of microwell array grid 5 are as follows: as shown in Fig. 2, gathering in circular sheet shape glass matrix along axial
Micron order through-hole 10, all through-holes 10 it is parallel and with the glass matrix axis at 7~15 ° of angles, in the glass matrix top surface
Metal-plated membrane is as trigger signal bypass electrode 11；The diameter of the circular sheet shape glass matrix is 23mm, with a thickness of
0.3mm；10 aperture of through-hole is the one third of level-one microchannel plate 4,6 channel aperture of second level microchannel plate, micro- logical in view of level-one
Guidance tape 4,20 μm of 6 channel aperture of second level microchannel plate determine that 10 aperture of through-hole is 6~7 μm, this ratio is conducive to reduce electronics
Beam images aberration；The metal film is aluminium film, and with a thickness of 630nm, the metal film extends to often from the glass matrix top surface
On the inner wall of a 10 aperture depth 30nm of through-hole, so that the 40% of electron beam image energy is oriented to touching by trigger signal bypass electrode 11
Power Generation Road makes electron beam image energy retain part and is no more than 60%, avoid micro- by second level while realizing effectively triggering
Channel plate 6 carries out being unlikely to be saturated when secondary enhancing, to improve the imaging resolution and dynamic range of detection image.
Described its design feature of fluorescent screen 7 are as follows: in glass basic surface dispensing of conductive film, conductive material is tin indium oxide
(ITO) or fluorine-doped tin oxide (FTO) fluorescence coating, is distributed on conductive film, fluorescent material is ZnO or CsPbX3(X:Cl,
Br、I)。
Voltage between photocathode 3 and level-one microchannel plate 4 is 200V；Level-one microchannel plate 4, second level microchannel plate 6
Respective both end voltage is 800~1000V；Voltage between 7 conductive film of second level microchannel plate 6 and fluorescent screen is 2000~
4000V。
The optoelectronic sensor of the gating video camera 9 is CMOS or ICCD.
The bottom surface of microwell array grid 5 is contacted with the incident end face of second level microchannel plate 6；Trigger signal bypass electrode 11 connects
The trigger signal input terminal of trigger circuit, the gating signal output end of trigger circuit respectively with the pulse power, control circuit respectively
Gating signal input terminal connection, two electrode tips of the pulse power connect respectively level-one microchannel plate 4 outgoing end electrode and
50~100V backward voltage or 200~250V is added in the incident end face electrode of second level microchannel plate 6 between two electrodes
Forward voltage；The electronic shutter of video camera 9 is led in the driving signal output end selecting of control circuit.
Claims (8)
1. a kind of from triggering strobed laser imaging device, which is characterized in that glass window (1) is plugged in insulation shell (2) one end,
From the end in insulation shell (2) internal successively mosaic photocathode (3), level-one microchannel plate (4), microwell array grid (5), two
Grade microchannel plate (6), fluorescent screen (7) are plugged in insulation shell (2) other end, and fluorescent screen (7) goes out light side and successively connects optical fiber light
Bore (8), gating video camera (9)；Microwell array grid (5) its design feature are as follows: along axial direction in circular sheet shape glass matrix
It gathers micron order through-hole (10), all through-holes (10) are in parallel and with the glass matrix axis at 7~15 ° of angles, in the glass
Matrix top surface metal-plated membrane is as trigger signal bypass electrode (11)；The bottom surface and second level microchannel of microwell array grid (5)
The incident end face of plate (6) contacts；Trigger signal bypass electrode (11) contacts the trigger signal input terminal of Power Generation Road, trigger circuit
Gating signal output end is connect with the pulse power, the respective gating signal input terminal of control circuit respectively, and two of the pulse power
Electrode tip connects the outgoing end electrode of level-one microchannel plate (4) and the incident end face electrode of second level microchannel plate (6) respectively, at this
50~100V backward voltage or 200~250V forward voltage are added between two electrodes；The driving signal of control circuit exports
The electronic shutter of termination gating video camera (9).
2. according to claim 1 from triggering strobed laser imaging device, which is characterized in that glass window (1) material is
Glass for infrared rays.
3. according to claim 1 from triggering strobed laser imaging device, which is characterized in that the photocathode (3) is thick
Degree is 5mm, diameter 25mm, is a kind of GaAs photocathode.
4. according to claim 1 from triggering strobed laser imaging device, which is characterized in that the level-one microchannel plate
(4), second level microchannel plate (6) diameter is 27mm, and effective aperture 18.4mm, channel aperture is 20 μm, access opening away from being 8 μm,
With a thickness of 0.3mm, draw ratio 15.
5. according to claim 1 from triggering strobed laser imaging device, which is characterized in that the circular sheet shape glass
The diameter of matrix is 23mm, with a thickness of 0.3mm；Through-hole (10) aperture is level-one microchannel plate (4), second level microchannel plate (6) is logical
The one third in road aperture；The metal film is aluminium film, and with a thickness of 630nm, the metal film prolongs from the glass matrix top surface
On the inner wall for reaching each through-hole (10) aperture depth 30nm.
6. according to claim 1 from triggering strobed laser imaging device, which is characterized in that its knot of the fluorescent screen (7)
Structure feature are as follows: in glass basic surface dispensing of conductive film, conductive material is tin indium oxide or fluorine-doped tin oxide, on conductive film
It is distributed fluorescence coating, fluorescent material is ZnO or CsPbX3, one of X Cl, Br, I.
7. according to claim 1 from triggering strobed laser imaging device, which is characterized in that photocathode (3) and level-one
Voltage between microchannel plate (4) is 200V；Level-one microchannel plate (4), second level microchannel plate (6) respective both end voltage are
800~1000V；Voltage between second level microchannel plate (6) and fluorescent screen (7) is 2000~4000V.
8. according to claim 1 from triggering strobed laser imaging device, which is characterized in that the gating video camera (9)
Optoelectronic sensor be CMOS or ICCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910341793.6A CN110095785B (en) | 2019-04-25 | 2019-04-25 | Self-triggering gating laser imaging device |
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| CN201910341793.6A CN110095785B (en) | 2019-04-25 | 2019-04-25 | Self-triggering gating laser imaging device |
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| CN110095785B CN110095785B (en) | 2020-08-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111521119A (en) * | 2020-04-24 | 2020-08-11 | 北京科技大学 | Casting blank thickness self-adaptive online image acquisition method |
| CN112484849A (en) * | 2020-11-23 | 2021-03-12 | 北京卫星环境工程研究所 | Integrated space far ultraviolet radiation detector and quantum efficiency test system thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111521119A (en) * | 2020-04-24 | 2020-08-11 | 北京科技大学 | Casting blank thickness self-adaptive online image acquisition method |
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| CN112484849A (en) * | 2020-11-23 | 2021-03-12 | 北京卫星环境工程研究所 | Integrated space far ultraviolet radiation detector and quantum efficiency test system thereof |
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