CN207216033U - It is a kind of to carry time-gated multichannel hard x-ray imaging detector - Google Patents
It is a kind of to carry time-gated multichannel hard x-ray imaging detector Download PDFInfo
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- CN207216033U CN207216033U CN201721160966.7U CN201721160966U CN207216033U CN 207216033 U CN207216033 U CN 207216033U CN 201721160966 U CN201721160966 U CN 201721160966U CN 207216033 U CN207216033 U CN 207216033U
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Abstract
Time-gated multichannel hard x-ray imaging detector is carried the utility model discloses a kind of, solves the problems, such as prior art temporal resolution and spatial resolution is low and visual field is small so as to not reaching actual detection demand when detecting hard X ray.The utility model includes mainly filtering window by detector framework, ray and fluorescent screen encloses the vacuum cavity set into sealing jointly, multichannel hard X ray detection photocathode and microchannel plate in vacuum cavity, and pulsed high voltage generator；Pulsed high voltage generator is respectively multichannel hard X ray detection photocathode and microchannel plate provides operating voltage, and on-load voltage between multichannel hard X ray detection photocathode and microchannel plate and between microchannel plate and fluorescent screen.The utility model is simple in construction, design science is reasonable, and temporal resolution, optimization spatial resolution and object space can be effectively improved when detecting hard X ray and is differentiated, and possesses time-gated function, while has very big detection viewing field.
Description
Technical field
It the utility model is related to plasma physics and nuclear detection field, and in particular to a kind of to lead to time-gated more
Road hard x-ray imaging detector.
Background technology
Hard X ray and matter interaction, photoelectric effect and Compton effect mainly occurs, and every kind of effect is all produced
Raw corresponding high energy primary electron.These primary electrons continue and matter interaction so that the atom of material, molecular ionization and
Excite.If caused ionization and the signal excited, can draw from the material in certain material, formed through collecting amplification
To be available for the electric impulse signal that analysis records, this material can be used as the detection medium of Hard X-ray Detector.
Photoelectric effect and Compton effect can occur in any material for hard X ray, but not be that any material all may be used
Detection medium as hard X ray.Secondary electron produced in material ionization and excite be produce electronic and ionic to, flash of light and electricity
Sub- hole equity.These obvious signals can not be drawn in opaque insulating materials and thicker conductor.It is and very thin
Metal film detection negative electrode can only detect grenz ray, so current hard x-ray imaging detector is generally scintillator detector.
Because scintillator has the longer sunset glow time (several ns to hundreds of ns), the time in some scientific experiments far can not be met
Differentiate and require and gate duration technical requirements.Therefore, design a kind of with time-gated multichannel hard x-ray imaging detection
Device, using detection can hard X ray of the segment limit as 10keV-300keV when, improve temporal resolution, optimization spatial resolution and
Object space is differentiated, and turns into technical field technical staff technical problem urgently to be resolved hurrily.
Utility model content
The technical problems to be solved in the utility model is：There is provided and a kind of carry time-gated multichannel hard x-ray imaging
Detector, solve prior art temporal resolution and space point when detection energy segment limit is 10keV-300keV hard X ray
Resolution is low and detection viewing field it is small so as to not reach actual detection demand the problem of.
To achieve the above object, the technical solution adopted in the utility model is as follows：
It is a kind of to carry time-gated multichannel hard x-ray imaging detector, including mainly filtered by detector framework, ray
Window and fluorescent screen enclose the vacuum cavity set into sealing jointly, the multichannel hard X ray detection in the vacuum cavity
Photocathode and microchannel plate, and pulsed high voltage generator；
The ray filter window, multichannel hard X ray detection photocathode, the microchannel plate and the fluorescent screen are successively
It is arranged in parallel, and ray filter window and the fluorescent screen are located at the front-end and back-end of the vacuum cavity respectively；It is described to penetrate
Line filter window is used to receive to allow hard X ray to pass through during radiation exposure and inject in the vacuum cavity, while shields grenz ray and β
Ray, the multichannel hard X ray detection photocathode, which is used to detect through ray filter window, enters the vacuum cavity
Hard X ray, at the same by the hard X ray signal detected be converted to electronic signal output, the microchannel plate be used for from
The electronics of multichannel hard X ray detection photocathode carries out gain, and the fluorescent screen is used for the electricity after micro channel plate gain
Subsignal is converted into visible light signal；
The pulsed high voltage generator is located at outside the vacuum cavity, and detects time with the multichannel hard X ray respectively
Pole, the microchannel plate and fluorescent screen electrical connection, for detecting photocathode and described micro- logical for the multichannel hard X ray
Guidance tape provides operating voltage, meanwhile, the pulsed high voltage generator also detects photocathode and described micro- in the multichannel hard X ray
On-load voltage, the on-load voltage play guiding electricity between channel plate and between the microchannel plate and the fluorescent screen
Son is propagated and increases electron energy so as to strengthen the effect of visible light signal.
Further, the vacuum of the vacuum cavity is higher than 1 × 10-2Pa, ray filter window are titanium window or beryllium window, and
And thickness is 0.1mm-1mm.
Further, the multichannel hard X ray detection photocathode is included under hard X ray photon irradiation and the irradiation
Hard X ray photon, which is had an effect, produces primary photoelectronic cathode substrate, and two be equidistantly given in the cathode substrate
Individual above cathode channel, one layer of alkali metal coating each is equipped with the cathode channel inwall, all cathode channels are equal
Through the penetrability duct of the cathode substrate tow sides, to be reached when resulting from the primary photoelectron in the cathode substrate
The alkali metal coating on the cathode channel inwall will be ionized during the cathode channel so as to produce low energy secondary electrons, and it is described
Secondary electrons detect photocathode and the microchannel after snowslide is amplified in the cathode channel in the multichannel hard X ray
The microchannel plate is come under voltage effect between plate；The diameter of all cathode channels is identical, is 3 μm -30 μm, owns
Spacing between the adjacent cathode channel is identical, is 5 μm -35 μm, and all cathode channels and the negative electrode base
Angle between the normal at bottom is consistent, is 0.1 ° -15 °.
Further, the working gain of the multichannel hard X ray detection photocathode is 5-100, the cathode substrate
Thickness is 0.5mm-3mm, and the secondary electrons are less than 50eV electronics, the preferred metal Na coating of alkali metal coating for energy
Or metal K coating.
Further, it is 1mm- that the multichannel hard X ray detection photocathode filters the distance between window with the ray
30mm, the microchannel plate and multichannel hard X ray detection the distance between photocathode are 0.3mm-2mm, the fluorescence
The distance between screen and the microchannel plate are 0.8mm-3mm.
Further, the thickness of the microchannel plate is 0.4mm-2mm, and its gain to electronics is 200-10000.
Further, the phosphor powder layer on the fluorescent screen is located in the vacuum cavity, and the thickness of the phosphor powder layer is 3
μm -8 μm, and the preferred P11 types fluorescent material of fluorescent material or P46 type fluorescent material used by the phosphor powder layer.
Further, the voltage between former and later two end faces of the multichannel hard X ray detection photocathode is 200V-
2000V, the voltage between former and later two end faces of the microchannel plate is 500V-2000V, the multichannel hard X ray detection
Voltage between photocathode and the microchannel plate is 50V-500V, and the voltage between the microchannel plate and the fluorescent screen is
3000V-8000V。
Further, the voltage between former and later two end faces of the microchannel plate is pulse voltage, and its pulse is wide
Spend and be respectively less than 1.5ns for 3ns-20ns, the rise time and fall time of pulse voltage；The microchannel plate and the fluorescent screen
Between voltage be pulse voltage, and its pulse width is 5 μ s-20 μ s.
Further, the hard X ray is the hard X ray that energy segment limit is 10keV-300keV.
Compared with prior art, the utility model has the advantages that：
(1) the utility model is simple in construction, design science is reasonable, easy to use, is 10keV- in detection energy segment limit
Temporal resolution, optimization spatial resolution can be effectively improved during 300keV hard X ray, and possesses time-gated function, together
When possess very big detection viewing field.
(2) ray is filtered window by the utility model, multichannel hard X ray detects photocathode, microchannel plate and fluorescent screen successively
Setting arranged in parallel, ray is filtered into window and fluorescent screen is located at the front-end and back-end of vacuum cavity, multichannel hard X ray detection time
Pole uses several cathode channels that equidistant array distribution is opened up in cathode substrate, and plating sets alkali on the inwall of cathode channel
The coat of metal, the thickness of multichannel hard X ray detection photocathode (namely cathode substrate) are set to 0.5mm-3mm, all negative electrodes
Set one 0.1 ° -15 ° of angle between passage and the normal of cathode substrate, the phosphor powder layer thickness on fluorescent screen is into 3 μm -8 μm；
Meanwhile multichannel hard X ray detection photocathode filters the distance between window with ray and is set to 1mm-3mm, microchannel plate and multichannel
The distance between hard X ray detection photocathode is set to 0.3mm-2mm, and the distance between fluorescent screen and microchannel plate are set to 0.8mm-
3mm；Also, 200V-2000V voltage, microchannel are loaded between former and later two end faces of multichannel hard X ray detection photocathode
Between former and later two end faces of plate load 500V-2000V voltage, multichannel hard X ray detection photocathode and microchannel plate it
Between load 50V-500V voltage, between microchannel plate and fluorescent screen load 3000V-8000V voltage；By above-mentioned special tight
The design gathered, make the utility model detection can segment limit be 10keV-300keV hard X ray when, can will effectively by when
Between resolution ratio improve at least one magnitude, spatial resolution is optimized to 0.6mm, object space can be made by suitable experimental layout
Spatial discrimination reaches 10 μm, meanwhile, the utility model is possessed time-gated function, and be also equipped with very big detection and regard
.
(3) for the utility model when being exposed to ray filter window by detected ray, ray filter window shielding is in by detected ray
Grenz ray and β rays, and the hard X ray that energy segment limit is 10keV-300keV in by detected ray may pass through ray filter window and enter
Enter in vacuum cavity and expose to multichannel hard X ray detection photocathode, into the hard X ray signal in vacuum cavity through excessive
Electronic signal is converted into after passage hard X ray detection photocathode, the electronic signal changed detects light in multichannel hard X ray
The cathode channel of negative electrode can obtain gain, by the electronic signal of the detection photocathode conversion of multichannel hard X ray and gain more logical
Microchannel plate is come under voltage effect between road hard X ray detection photocathode and microchannel plate and its signal is by microchannel plate
Enhancing, enhanced electronic signal comes fluorescent screen under the voltage effect between microchannel plate and fluorescent screen, due to uniqueness
Multichannel hard X ray detects photocathode and the hard X ray signal that energy segment limit is 10keV-300keV is converted into electronic signal simultaneously
Gain is carried out to electronic signal, under the high pressure effect between microchannel plate and fluorescent screen, electronic signal is enhanced again, significantly
The electronic signal of gain is changed into the visible light signal for being easy to record to detect by fluorescent screen, so the detector has preferably
It detection efficient, can be used for weak light detection, disclosure satisfy that time resolution requirement and gate duration technical requirements in scientific experiment.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is that the utility model multichannel hard X ray detects photocathode structural representation.
Fig. 3 is the Section A-A figure in Fig. 2.
Fig. 4 is the utility model pulsed high voltage generator external circuitses block diagram.
Wherein, it is entitled corresponding to reference：
1- detectors framework, 2- rays filter window, 3- multichannels hard X ray detection photocathode, 4- microchannel plates, 5- fluorescence
Screen, 6- pulsed high voltage generators, 7- vacuum cavities, 31- cathode substrates, 32- cathode channels, 33- alkali metal coating.
Embodiment
The utility model is described in further detail with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the present utility model includes
But it is not limited only to following examples.
As Figure 1-4, it is provided by the utility model a kind of with time-gated multichannel hard x-ray imaging detection
Device, it is simple in construction, design science is reasonable, it is easy to use, detection can segment limit be 10keV-300keV hard X ray when can have
Effect improves temporal resolution, optimization spatial resolution, and possesses time-gated function, while possesses very big detection viewing field.
The utility model includes mainly filtering window 2 by detector framework 1, ray and fluorescent screen 5 encloses the vacuum cavity set into sealing jointly
7, multichannel hard X ray detection photocathode 3 and microchannel plate 4 in the vacuum cavity 7, and pulsed high voltage generator
6, the vacuum cavity 7 is vacuum environment；The vacuum of the vacuum cavity 7 is higher than 1 × 10-2Pa, the ray filter window 2 is titanium
Window or beryllium window, and thickness is 0.1mm-1mm, and the hard X ray is the hard X ray that energy segment limit is 10keV-300keV.
Ray described in the utility model filters window 2, multichannel hard X ray detection photocathode 3, the and of the microchannel plate 4
The fluorescent screen 5 is arranged in parallel successively, and ray filter window 2 and the fluorescent screen 5 are respectively positioned at the vacuum cavity 7
Front-end and back-end；The ray filter window 2 is used to receive to allow hard X ray to pass through during radiation exposure and inject in the vacuum cavity 7,
Grenz ray and β rays are shielded simultaneously, and the multichannel hard X ray detection photocathode 3, which is used to detect through the ray, filters window 2
The hard X ray of the vacuum cavity 7 is entered, while the hard X ray signal detected is converted into electronic signal output, institute
State microchannel plate 4 to be used to carry out the electronics for detecting photocathode 3 from multichannel hard X ray gain, the fluorescent screen 5 is used for will
Visible light signal is converted into by 4 enhanced electronic signal of microchannel plate.
Pulsed high voltage generator 6 described in the utility model is located at outside the vacuum cavity 7, and respectively with the hard X of the multichannel
X-ray detection X photocathode 3, the microchannel plate 4 and the fluorescent screen 5 electrically connect, for being detected for the multichannel hard X ray
Photocathode 3 and the microchannel plate 4 provide operating voltage, meanwhile, the pulsed high voltage generator 6 is also penetrated in the hard X of the multichannel
Line detects between photocathode 3 and the microchannel plate 4 and loaded between the microchannel plate 4 and the fluorescent screen 5 electricity
Pressure.
For the utility model when being exposed to ray filter window by detected ray, ray filter window shields the soft X in by detected ray
Ray and β rays, and the hard X ray that energy segment limit is 10keV-300keV in by detected ray may pass through ray and filter window into very
In cavity body and multichannel hard X ray detection photocathode is exposed to, passes through multichannel into the hard X ray signal in vacuum cavity
Electronic signal is converted into after hard X ray detection photocathode, the electronic signal changed detects photocathode in multichannel hard X ray
Cathode channel can obtain gain, by multichannel hard X ray detection photocathode conversion and gain electronic signal in the hard X of multichannel
Microchannel plate is come under voltage effect between X-ray detection X photocathode and microchannel plate and its signal is strengthened by microchannel plate,
Enhanced electronic signal comes fluorescent screen under the voltage effect between microchannel plate and fluorescent screen, due to the multichannel of uniqueness
Hard X ray detects photocathode and the hard X ray signal that energy segment limit is 10keV-300keV is converted into electronic signal and to electronics
Signal carries out gain, while microchannel plate carries out significant gains to electronic signal again, between microchannel plate and fluorescent screen
Under high pressure effect, electronic signal is enhanced again, and the electronic signal that significant gains are crossed is changed into by fluorescent screen is easy to record to detect
Visible light signal, so the detector has preferable detection efficient, can be used for weak light detection, disclosure satisfy that scientific experiment
Middle time resolution requirement and gate duration technical requirements.
Multichannel hard X ray detection photocathode 3 described in the utility model is included under hard X ray photon irradiation and the irradiation
Hard X ray photon have an effect the primary photoelectronic cathode substrate 31 of generation, and be equidistantly given in the cathode substrate 31
On two or more cathode channel 32, the pulsed high voltage generator 6 electrically connects with the cathode substrate 31 and is the negative electrode base
Bottom 31 provides operating voltage.One layer of alkali metal coating 33, all negative electrodes are equipped with each inwall of cathode channel 32
Passage 32 be through the penetrability duct of the tow sides of cathode substrate 31, when result from the cathode substrate 31 just
Level photoelectron reaches during the cathode channel 32 that the alkali metal coating 33 ionized on the inwall of cathode channel 32 is low so as to produce
Can secondary electrons, and the secondary electrons in the cathode channel 32 after snowslide is amplified in the multichannel hard X ray
The microchannel plate 4 is come under voltage effect between detection photocathode 3 and the microchannel plate 4；All negative electrodes
The diameter of passage 32 is identical, is 3 μm -30 μm, and the spacing between all adjacent cathode channels 32 is identical, is 5 μm of -35 μ
M, and the angle between all cathode channels 32 and the normal of the cathode substrate 31 is consistent, is 0.1 ° -15 °.
The working gain of multichannel hard X ray described in the utility model detection photocathode 3 is 5-100, the cathode substrate
31 thickness is 0.5mm-3mm, and the secondary electrons are less than 50eV electronics, the 33 preferred metal of alkali metal coating for energy
Na coating or metal K coating.
Cathode substrate 31 described in the utility model can select existing known cathode substrate, can also select by Pb, Si
With O these three elements made of cathode substrate (wherein the mass percent of lead element is not less than 40%).
The thickness of the utility model multichannel hard X ray detection photocathode (namely cathode substrate) is 0.5-3mm, shape
It can be formulated according to actual conditions, a diameter of 3 μm -30 μm of cathode channel, the spacing of neighbouring cathode passage is 5 μm -35 μm, and
It is in one 0.1 ° -15 ° of angle between cathode channel and the normal of cathode substrate；At the beginning of the spacing of neighbouring cathode passage forms high energy
" wall thickness " that level photoelectron is passed through between the neighbouring cathode passage, hindering equidistant array because of cathode substrate has multiple negative electrodes to lead to
Road, therefore " wall thickness " that high energy primary photoelectron only needs to pass through between cathode channel with regard to that can reach in cathode channel, therefore
Cathode substrate can be done thick to detect hard X ray of the energy segment limit as 10-300keV；Meanwhile the utility model is carrying out energy section
When scope is the detection of 10-300keV hard X ray, the process of caused primary photoelectron and secondary electrons is ionization,
And ionization process then can be regarded as transient physical process, time scale is about 1 × 10-21S's, far smaller than scintillator moves back
Swash the relaxation time, effectively realize sunset glow time short purpose；So temporal resolution can at least be carried compared to prior art
A high magnitude, while also spatial resolution can be optimized to 0.06mm.
It is 1mm- that multichannel hard X ray detection photocathode 3 described in the utility model filters the distance between window 2 with the ray
3mm, the microchannel plate 4 and multichannel hard X ray detection the distance between photocathode 3 are 0.3mm-2mm, the fluorescence
It is 0.8mm-3mm to shield the distance between 5 and the microchannel plate 4.
The thickness of microchannel plate 4 described in the utility model is 0.4mm-2mm, and its gain to electronics is 200-
10000；Phosphor powder layer on the fluorescent screen 5 is located in the vacuum cavity 7, and the thickness of the phosphor powder layer is 3 μm of -8 μ
M, and fluorescent material can choose the fluorescent material of suitable type as needed used by the phosphor powder layer, and the present embodiment is preferable
Fluorescent material type is P11 types (ZnS：Ag) fluorescent material or P46 types (YAG：Ce) fluorescent material.
Voltage between former and later two end faces of multichannel hard X ray detection photocathode 3 described in the utility model is 200V-
Voltage between 2000V, that is, former and later two end faces of cathode substrate 31 is 200V-2000V, before the microchannel plate 4
Voltage between latter two end face is 500V-2000V, and the multichannel hard X ray detection photocathode 3 (that is to say cathode substrate
31) voltage between the microchannel plate 4 is 50V-500V, and the voltage between the microchannel plate 4 and the fluorescent screen 5 is
3000V-8000V。
Voltage between former and later two end faces of microchannel plate 4 described in the utility model is pulse voltage, and its pulse
Width is 3ns-20ns, and the rise time and fall time of pulse voltage are respectively less than 1.5ns；The microchannel plate 4 and described glimmering
Voltage between optical screen 5 is pulse voltage, and its pulse width is 5 μ s-20 μ s.
The utility model is parallel successively with fluorescent screen by ray filter window, multichannel hard X ray detection photocathode, microchannel plate
Spread configuration, ray is filtered into window and fluorescent screen is located at the front-end and back-end of vacuum cavity, multichannel hard X ray detection photocathode is adopted
With several cathode channels that equidistant array distribution is opened up in cathode substrate, and plating sets alkali metal on the inwall of cathode channel
Coating, the thickness of cathode substrate are set to 1mm-3mm, one 0.1 ° -15 ° are set between the normal of all cathode channels and cathode substrate
Angle, the phosphor powder layer thickness on fluorescent screen is into 3 μm -8 μm；Meanwhile multichannel hard X ray detection photocathode and ray filter window
The distance between be set to 1mm-3mm, the distance between microchannel plate and multichannel hard X ray detection photocathode are set to 0.3mm-
2mm, the distance between fluorescent screen and microchannel plate are set to 0.8mm-3mm；Also, before multichannel hard X ray detection photocathode
200V-2000V voltage is loaded between latter two end face, loads 500V-2000V's between former and later two end faces of microchannel plate
Voltage, 50V-500V voltage, microchannel plate and fluorescent screen are loaded between multichannel hard X ray detection photocathode and microchannel plate
Between load 3000V-8000V voltage；By above-mentioned special compact design, make the utility model detection can segment limit be
During 10keV-300keV hard X ray, temporal resolution effectively can will be improved at least one magnitude, by spatial resolution
0.6mm is optimized to, object space is differentiated and reaches 10 μm, meanwhile, the utility model is possessed time-gated function, and also
Possesses powerful visual field effect.
Above-described embodiment is only one of preferred embodiment of the present utility model, be should not be taken to limit of the present utility model
Protection domain, as long as in body design thought of the present utility model and that mentally makes have no the change of essential meaning or profit
Color, the technical problem that it is solved is still consistent with the utility model, should be included in the scope of protection of the utility model
Within.
Claims (10)
1. a kind of carry time-gated multichannel hard x-ray imaging detector, it is characterised in that：Including mainly by detector frame
Body (1), ray filter window (2) and fluorescent screen (5) enclose the vacuum cavity (7) set into sealing jointly, located at the vacuum cavity
(7) multichannel hard X ray detection photocathode (3) and microchannel plate (4) in, and pulsed high voltage generator (6)；
The ray filter window (2), multichannel hard X ray detection photocathode (3), the microchannel plate (4) and the fluorescence
Screen (5) is arranged in parallel successively, and ray filter window (2) and the fluorescent screen (5) are respectively positioned at the vacuum cavity (7)
Front-end and back-end；The ray filter window (2) is used to receive to allow hard X ray to pass through during radiation exposure and inject the vacuum cavity
(7) in, while grenz ray and β rays are shielded, the multichannel hard X ray detection photocathode (3) is used to detect penetrates through described
Line filter window (2) enters the hard X ray of the vacuum cavity (7), while the hard X ray signal detected is converted into electronics
Signal output, the microchannel plate (4) are used to carry out gain, institute to the electronics for detecting photocathode (3) from multichannel hard X ray
Fluorescent screen (5) is stated to be used to the electronic signal after microchannel plate (4) gain being converted into visible light signal；
The pulsed high voltage generator (6) is located at the vacuum cavity (7) outside, and detects light with the multichannel hard X ray respectively
Negative electrode (3), the microchannel plate (4) and the fluorescent screen (5) electrical connection, for detecting time for the multichannel hard X ray
Pole (3) and the microchannel plate (4) provide operating voltage, meanwhile, the pulsed high voltage generator (6) is also in the hard X of the multichannel
Between X-ray detection X photocathode (3) and the microchannel plate (4) and the microchannel plate (4) and the fluorescent screen (5) it
Between on-load voltage, institute's on-load voltage plays a part of to guide electron-propagation and increases electron energy so as to strengthening visible light signal.
2. it is according to claim 1 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：The vacuum of the vacuum cavity (7) is higher than 1 × 10-2Pa, the ray filter window (2) is titanium window or beryllium window, and thickness is
0.1mm-1mm。
3. it is according to claim 2 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：The multichannel hard X ray detection photocathode (3) is included in the hard X ray photon under hard X ray photon irradiation with the irradiation
The primary photoelectronic cathode substrate (31) of generation of having an effect, and two be equidistantly given in the cathode substrate (31) with
Upper cathode channel (32), each it is equipped with one layer of alkali metal coating (33), all described the moon on cathode channel (32) inwall
Pole passage (32) is through the penetrability duct of the cathode substrate (31) tow sides, when resulting from the cathode substrate
(31) the primary photoelectron on plates the alkali metal ionized on cathode channel (32) inwall when reaching cathode channel (32)
Layer (33) so as to produce low energy secondary electrons, and the secondary electrons in the cathode channel (32) after snowslide is amplified
The microchannel is come under voltage effect between the multichannel hard X ray detection photocathode (3) and the microchannel plate (4)
Plate (4)；The diameter of all cathode channels (32) is identical, be 3 μm -30 μm, all adjacent cathode channels (32) it
Between spacing it is identical, be 5 μm -35 μm, and between the normal of all cathode channels (32) and the cathode substrate (31)
Angle it is consistent, be 0.1 ° -15 °.
4. it is according to claim 3 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：The working gain of the multichannel hard X ray detection photocathode (3) is 5-100, and the thickness of the cathode substrate (31) is
0.5mm-3mm, the secondary electrons are the electronics that energy is less than 50eV, and the alkali metal coating (33) is metal Na coating or gold
Belong to K coating.
5. it is according to claim 4 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：It is 1mm-30mm that the multichannel hard X ray detection photocathode (3) filters the distance between window (2) with the ray, described micro-
The distance between channel plate (4) and multichannel hard X ray detection photocathode (3) are 0.3mm-2mm, the fluorescent screen (5)
The distance between described microchannel plate (4) is 0.8mm-3mm.
6. it is according to claim 5 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：The thickness of the microchannel plate (4) is 0.4mm-2mm, and its gain to electronics is 200-10000.
7. it is according to claim 6 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：Phosphor powder layer on the fluorescent screen (5) is located in the vacuum cavity (7), and the thickness of the phosphor powder layer is 3 μm -8 μm,
And fluorescent material is P11 types fluorescent material or P46 type fluorescent material used by the phosphor powder layer.
8. it is according to claim 7 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：Voltage between former and later two end faces of the multichannel hard X ray detection photocathode (3) is 200V-2000V, described micro-
Voltage between former and later two end faces of channel plate (4) is 500V-2000V, the multichannel hard X ray detection photocathode (3)
Voltage between the microchannel plate (4) is 50V-500V, the electricity between the microchannel plate (4) and the fluorescent screen (5)
Press as 3000V-8000V.
9. it is according to claim 8 it is a kind of carry time-gated multichannel hard x-ray imaging detector, its feature exists
In：Voltage between former and later two end faces of the microchannel plate (4) is pulse voltage, and its pulse width is 3ns-
20ns, the rise time and fall time of pulse voltage are respectively less than 1.5ns；The microchannel plate (4) and the fluorescent screen (5) it
Between voltage be pulse voltage, and its pulse width is 5 μ s-20 μ s.
It is 10. a kind of with time-gated multichannel hard x-ray imaging detection according to claim 1-9 any one
Device, it is characterised in that：The hard X ray is the hard X ray that energy segment limit is 10keV-300keV.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613739A (en) * | 2018-04-18 | 2018-10-02 | 北京卫星环境工程研究所 | Small-sized ionosphere photometer suitable for micro-nano satellite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613739A (en) * | 2018-04-18 | 2018-10-02 | 北京卫星环境工程研究所 | Small-sized ionosphere photometer suitable for micro-nano satellite |
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