CN214226860U - Faraday cup receiver - Google Patents
Faraday cup receiver Download PDFInfo
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- CN214226860U CN214226860U CN202023275491.0U CN202023275491U CN214226860U CN 214226860 U CN214226860 U CN 214226860U CN 202023275491 U CN202023275491 U CN 202023275491U CN 214226860 U CN214226860 U CN 214226860U
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Abstract
The utility model belongs to the technical field of the isotope mass spectrometer, concretely relates to Faraday cup receiver and receiving method thereof, include: the device comprises a shielding shell assembly, a suppression pole assembly, a cup body assembly and a plurality of mounting screws; and the suppression pole assembly and the cup body assembly are fixedly arranged inside the shielding shell assembly. The utility model discloses a have shielding case and restrain the faraday cup receiver of utmost point, processing is simple, the assembly precision is easily guaranteed, can effectively shield stray ion interference and secondary electron escape, can be used as the detector of receiving more isotope mass spectrometers.
Description
Technical Field
The utility model belongs to the technical field of the isotope mass spectrometer, concretely relates to Faraday cup receiver.
Background
The faraday cup receiver is an important sensor of the mass spectrometer, and converts the ion current moving in vacuum into the electron current in a conductor, thereby realizing the measurement of the ion current intensity. The multi-receiving isotope mass spectrometer measures the intensity of a plurality of ion flows simultaneously by utilizing receivers arranged in parallel, thereby realizing the determination of isotope ratio. When measuring isotopes of high-quality elements, the receiver spacing is small, and therefore the overall width of the receiver of the multi-receiving isotope mass spectrometer is narrow and is generally less than 2.5 mm. The multi-receiving isotope mass spectrometer adopts the signal ratio between the receivers as a final measurement result, and the consistency of the receiving efficiency is directly related to the measurement precision.
However, the receiving efficiency of the faraday cup receiver of the current multi-receiving isotope mass spectrometer is often susceptible to charge interference, leakage current and secondary electron escape to generate differences. Therefore, it is necessary to design a faraday cup receiver based on a metal material and provided with a shield case, a suppression pole, a cup body, and an insulating ceramic and a receiving method thereof to achieve the effects of high uniformity of receiving efficiency, small overall width, and easy processing and assembly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a Faraday cup receiver for solve current Faraday cup receiver shielding stray ion interference and secondary electron escape effect poor, the technical problem that the receiving efficiency uniformity is difficult to guarantee.
The technical scheme of the utility model:
a faraday cup receiver comprising: a shielding shell assembly 10, a suppression pole assembly 20, a cup body assembly 30 and a plurality of mounting screws; the suppressor pole assembly 20 and cup assembly 30 are secured inside the shielded housing assembly 10.
The shield case assembly 10 includes: the shielding shell comprises a shielding shell framework 11, a fixed shielding plate 12, a limiting slit 13, a shielding shell inlet 14, a detachable shielding plate 15, a plurality of nuts 16 and a lead fixing groove 17, wherein the fixed shielding plate 12 is welded on the lower surface of the shielding shell framework 11; the shielding shell framework 11 is integrally of a C-shaped structure, and a shielding shell inlet 14 is formed in the opening end of the shielding shell framework 11; a limiting slit 13 is arranged on the inner surface of the shielding shell framework 11 close to the opening end; the other end of the shielding shell framework 11 is in threaded connection with a lead fixing groove 17; the detachable shielding plate 15 is connected to the upper surface of the shielding shell skeleton 11 through a plurality of nuts 16.
A plurality of screw holes A111 for mounting the detachable shielding plate are symmetrically distributed on the upper surface of the shielding shell framework 11; the side surface of the shielding shell framework 11 is also provided with a suppression pole lead hole 112 and a threaded hole 114 for fixing a receiver; the inner side surface of the shielding shell framework 11 is respectively provided with a suppression pole assembly mounting groove 113 and a cup body assembly mounting groove 117;
the side surface of the lead fixing groove 17 screwed on the shielding shell framework 11 is also respectively provided with a signal wire through hole 115 and a wire pressing threaded hole 116;
the suppressor pole assembly 20 is arranged in the suppressor pole assembly mounting groove 113 of the shielding shell assembly 10; the cup assembly 30 is disposed in the cup assembly mounting groove 117 of the shield shell assembly 10.
A limiting slit 13 is also arranged in the suppression pole assembly mounting groove 113; the whole limiting slit 13 is of a rectangular plate-shaped structure, two ends of the limiting slit 13 are respectively provided with a folded edge 131, and the middle part of the limiting slit 13 is provided with a limiting seam 132; the shield case inlet 14 is a plate-shaped structure as a whole, and the shield case inlet 14 includes: a positioning projection 141 and an inlet slit 142; the positioning protrusions 141 are provided at both ends of the shield case inlet 14; the middle part of the shielding shell inlet 14 is provided with an inlet seam 142; the width of the restriction slit 132 is smaller than the width of the entrance slit 142.
The whole fixed shielding plate 12 is of a rectangular plate-shaped structure, one short side of the fixed shielding plate 12 is bent to form a folding baffle A121, and a shielding shell inlet positioning hole 122 is formed in the bending position of the folding baffle A121; a plurality of screw holes B123 are also uniformly formed on the surface of the fixed shielding plate 12.
The integral detachable shielding plate 15 is of a rectangular plate-shaped structure, one short edge of the detachable shielding plate 15 is bent to form a folding baffle plate B151, and a shielding shell inlet positioning hole 152 is formed in the bending position of the folding baffle plate B151; a plurality of nut positioning holes 153 are also uniformly formed on the surface of the detachable shielding plate 15.
The whole nut 16 is of a cylindrical structure, a threaded through hole 161 is formed in the position of the center of the circle of the nut 16, and one nut 16 is arranged in each nut positioning hole 153 in the detachable shielding plate 15; and is welded and fixed on the outer cylindrical surface of the nut 16 and the inner surface of the nut positioning hole 153.
The lead fixing groove 17 is further provided with a screw hole C171.
The suppressor pole assembly 20 includes: the device comprises a precision electrode 21, two positioning ceramic blocks 22, a suppression electrode lead 24 and a ceramic tube 23, wherein the positioning ceramic blocks 22 are fixedly arranged at two ends of the precision electrode 21, and the ceramic tube 23 is connected to the positioning ceramic block 22 at one end of the precision electrode 21; one end of the suppression pole lead wire 24 is welded with the precision electrode 21, and the other end of the suppression pole lead wire 24 penetrates out of the positioning ceramic block 22 and the ceramic tube 23.
The bowl assembly 30 includes: the cup body frame 31 and the cup body surrounding plate 32 are attached, spliced and fixed through welding; a positioning pin 33 is arranged on the side surface of the cup body framework 31; the positioning pin 33 is inserted into the inner positioning connection of the positioning ceramic block 22.
The whole cup body framework 31 is of a C-shaped structure; the upper surface of the bottom edge of the cup body framework 31 is provided with an air guide hole 312; the inner surface of the bottom edge of the cup body framework 31 is provided with an inclined angle for inhibiting secondary electron rebound; the inclination angle is greater than 5 degrees; a plurality of positioning holes 311 are formed in the side surface of the cup body frame 31; the cup body surrounding plate 32 is integrally in a U-shaped plate structure, and a cup body inlet 321 is formed in the bending part of the cup body surrounding plate 32;
the utility model discloses profitable technological effect:
the utility model has the following technical advantages:
(1) the utility model discloses install cup bounding wall and adopt the panel beating technology of bending, part is small in quantity, the assembly precision is high.
(2) The bottom of the cup body framework in the device adopts an inclined plane structure, secondary electrons are effectively restrained from directly flying to the entrance slit, and receiving efficiency is improved.
(3) The utility model discloses after the restraint utmost point between the restriction slit of device and the cup body component meets the low potential, and form the prevention electric field of ideal between the cup, effectively restrain the secondary electron escape.
(4) The ceramic positioning block effectively ensures the mutual insulation among the suppression electrode, the shielding shell and the cup body, and suppresses the influence of leakage current on the measurement precision.
(5) The shielding shell framework and the fixed shielding plate form an installation foundation after being welded, and the positioning accuracy of the shielding shell inlet, the limiting slit, the restraining pole assembly and the cup body is effectively guaranteed.
To sum up, the utility model discloses a Faraday cup receiver is a Faraday cup receiver with shielding shell and suppression utmost point, and its processing is simple, the assembly precision is easily guaranteed, can effectively shield stray ion interference and secondary electron escape, can be used as the detector of receiving more isotope mass spectrometers.
Drawings
FIG. 1 is a schematic view of the assembly structure of a Faraday cup receiver
FIG. 2 is a schematic view of the structure of the shielding case assembly of the present invention
FIG. 3 is a skeleton structure diagram of the shielding case of the present invention
FIG. 4 is a structural diagram of a fixed shield plate
FIG. 5 is a view of the structure of the restriction slit of the present invention
FIG. 6 is a structural diagram of the inlet of the shielding case
FIG. 7 is a structural diagram of a detachable shielding plate
Fig. 8 is a structure view of the nut of the present invention
FIG. 9 is a structure diagram of a lead wire fixing groove of the present invention
FIG. 10 is a schematic view of the structure of the suppressor module according to the present invention
FIG. 11 is a schematic view of a structure of the cup body assembly
FIG. 12 is a structural view of a cup body frame
Fig. 13 is the structure diagram of the cup coaming of the present invention, wherein: 10-a shielding shell assembly; 20-a suppressor pole assembly; 30-a cup assembly;
11-shielding shell skeleton; 12-fixing the shielding plate; 13-a restriction slit; 14-shield shell access; 15-detachable shielding plate; 16-a nut; 17-lead fixation groove, 111-screw hole a; 112-suppressor lead hole; 113-suppressor component mounting slots; 114-a threaded hole; 115-signal line via; 116-thread-pressing thread holes; 117-cup assembly mounting groove, 121-folding baffle a; 122-inlet positioning square hole; 123-screw holes B, 131-flanging; 132-restriction slit, 141-positioning projection; 142-entrance slit, 151-folding baffle B; 152-inlet positioning holes; 153-nut positioning hole, 161-thread through hole and 171-screw hole C;
21-precision electrodes; 22-positioning a ceramic block; 23-a ceramic tube; 24-a suppressor lead;
31-a cup body framework; 32-cup body coaming; 33-positioning pin, 311-positioning hole; 312-gas-conducting holes; 313-inclined plane, 321-cup inlet.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments,
as shown in fig. 1 to 6, a faraday cup receiver includes: a shielding shell assembly 10, a suppression pole assembly 20, a cup body assembly 30 and a plurality of mounting screws; the notch of the rectangular groove in the middle of the precision electrode 21 on the suppression pole assembly 20 is opposite to the opening of the cup body inlet 321 on the cup body assembly 30, and the suppression pole assembly 20 and the cup body assembly 30 are fixed inside the shielding shell assembly 10.
The shield case assembly 10 includes: the shielding shell comprises a shielding shell framework 11, a fixed shielding plate 12, a limiting slit 13, a shielding shell inlet 14, a detachable shielding plate 15, a plurality of nuts 16 and a lead fixing groove 17, wherein the fixed shielding plate 12 is welded on the lower surface of the shielding shell framework 11; the shielding shell framework 11 is integrally of a C-shaped structure, and a shielding shell inlet 14 is formed in the opening end of the shielding shell framework 11; a limiting slit 13 is arranged on the inner surface of the shielding shell framework 11 close to the opening end; the other end of the shielding shell framework 11 is in threaded connection with a lead fixing groove 17; the detachable shielding plate 15 is connected to the upper surface of the shielding shell skeleton 11 through a plurality of nuts 16.
The shielding shell assembly 10 can effectively prevent stray ions from shooting to the outer wall of the cup body assembly 30; a suppression electric field is formed between the suppression pole assembly 20 and the cup body assembly 30 to prevent secondary electrons from escaping; the cup assembly 30 converts the ion flow signal into an electron flow signal, which is transmitted to the amplifier via the lead.
A plurality of screw holes A111 for mounting the detachable shielding plate are symmetrically distributed on the upper surface of the shielding shell framework 11; the side surface of the shielding shell framework 11 is also provided with a suppression pole lead hole 112 and a threaded hole 114 for fixing a receiver; the inner side surface of the shielding shell framework 11 is respectively provided with a suppression pole assembly mounting groove 113 and a cup body assembly mounting groove 117;
the side surface of the lead fixing groove 17 screwed on the shielding shell framework 11 is also respectively provided with a signal wire through hole 115 and a wire pressing threaded hole 116;
the detachable shielding plate 15 is further provided with a folding baffle B151, a shielding case inlet positioning hole 152, and a nut positioning hole 153.
The suppressor pole assembly 20 is arranged in the suppressor pole assembly mounting groove 113 of the shielding shell assembly 10; the cup assembly 30 is disposed in the cup assembly mounting groove 117 of the shield shell assembly 10.
A limiting slit 13 is also arranged in the suppression pole assembly mounting groove 113; the whole limiting slit 13 is of a rectangular plate-shaped structure, two ends of the limiting slit 13 are respectively provided with a folded edge 131, and the middle part of the limiting slit 13 is provided with a limiting seam 132; the shield case inlet 14 is a plate-shaped structure as a whole, and the shield case inlet 14 includes: a positioning projection 141 and an inlet slit 142; the positioning protrusions 141 are provided at both ends of the shield case inlet 14; the middle part of the shielding shell inlet 14 is provided with an inlet seam 142; the width of the restriction slit 132 is smaller than the width of the entrance slit 142.
The whole fixed shielding plate 12 is of a rectangular plate-shaped structure, one short side of the fixed shielding plate 12 is bent to form a folding baffle A121, and a shielding shell inlet positioning square hole 122 is formed at the bending position of the folding baffle A121; a plurality of screw holes B123 are also uniformly formed on the surface of the fixed shielding plate 12.
The integral detachable shielding plate 15 is of a rectangular plate-shaped structure, one short edge of the detachable shielding plate 15 is bent to form a folding baffle plate B151, and a shielding shell inlet positioning hole 152 is formed in the bending position of the folding baffle plate B151; a plurality of nut positioning holes 153 are also uniformly formed on the surface of the detachable shielding plate 15.
The whole nut 16 is of a cylindrical structure, a threaded through hole 161 is formed in the position of the center of the circle of the nut 16, and one nut 16 is arranged in each nut positioning hole 153 in the detachable shielding plate 15; and is welded and fixed on the outer cylindrical surface of the nut 16 and the inner surface of the nut positioning hole 153.
Screw hole C171 is also provided in lead fixing groove 17.
The suppressor pole assembly 20 includes: the device comprises a precision electrode 21, two positioning ceramic blocks 22, a suppression electrode lead 24 and a ceramic tube 23, wherein the positioning ceramic blocks 22 are fixedly arranged at two ends of the precision electrode 21, and the ceramic tube 23 is connected to the positioning ceramic block 22 at one end of the precision electrode 21; one end of the suppression pole lead wire 24 is welded with the precision electrode 21, and the other end of the suppression pole lead wire 24 penetrates out of the positioning ceramic block 22 and the ceramic tube 23.
The precise electrode 21 is made of a conductor material, and the precise electrode 21 is also provided with pole pieces which are symmetrical up and down and are low-potential electrodes for preventing an electric field; the end part of the pole piece is in contact positioning with the positioning groove of the positioning ceramic block 22 to limit the freedom degree of the precision electrode 21 in the front and back directions; the end part of the precision electrode 21 is provided with a positioning plate which is matched with the positioning hole of the positioning ceramic block 22 to limit the degree of freedom of the precision electrode 21 in the vertical direction; the middle part of the precision electrode 21 is provided with a rectangular groove as an ion beam channel; after the material removed by the rectangular groove is folded outwards, elastic sheets are formed at two ends of the precision electrode 21 to assist the positioning and clamping of the pole piece in the positioning groove of the positioning ceramic block 22.
The middle part of the positioning ceramic block 22 is provided with a transverse positioning hole which is matched with the positioning plates at the two ends of the precision electrode 21; the side surface of the positioning ceramic block is provided with a positioning groove in the vertical direction, and the positioning groove is in contact positioning with the pole pieces and the elastic pieces at the two ends of the precision electrode 21.
The ceramic tube 23 is also provided with an axial through hole for the insulation penetration of the wire 24.
A small plane is extruded at the end part of the lead 24 so as to be convenient for welding with a positioning plate of the precision electrode 21 and supplying power to the precision electrode 21; the right-angled bent section of the lead 24 is used for limiting the axial movement of the ceramic tube 23, and ensures reliable insulation.
The bowl assembly 30 includes: the cup body frame 31 and the cup body surrounding plate 32 are attached and inserted, and are welded, sealed and fixed to form a box-shaped structure with an inlet; a positioning pin 33 is arranged on the side surface of the cup body framework 31; the positioning pin 33 is inserted into the inner positioning connection of the positioning ceramic block 22.
The whole cup body framework 31 is of a C-shaped structure; the upper surface of the bottom edge of the cup body framework 31 is provided with an air guide hole 312; the inner surface of the bottom edge of the cup body framework 31 is provided with an inclined angle for inhibiting secondary electron rebound; the angle of inclination is typically greater than 5 °; a plurality of positioning holes 311 are formed in the side surface of the cup body frame 31; the cup body surrounding plate 32 is integrally in a U-shaped plate structure, and a cup body inlet 321 is formed in the bending part of the cup body surrounding plate 32;
a method of receiving a faraday cup receiver as described above, comprising the steps of:
the method comprises the following steps: the front of the cup body inlet of the cup body component is sequentially arranged corresponding to the suppression pole component, the limiting slit and the shielding shell inlet to form a channel for ion beams to enter the receiver;
step two: by introducing negative voltage, a stopping electric field is formed between the suppressor assembly and the cup body assembly, and secondary electrons are inhibited from escaping;
the ceramic positioning block in the suppression pole assembly ensures that the suppression pole, the shielding shell and the cup body are mutually insulated and positioned accurately; the ion beam sequentially passes through the shielding shell inlet, the limiting slit and the rectangular groove in the middle of the suppression pole and finally enters the cup body assembly;
step three: secondary electrons generated after the ions impact the cup body assembly fly in the cup body assembly, and meanwhile, electron current is generated in the conductor to neutralize ion charges and secondary electron charges;
a signal wire connected with the cup body assembly sends a current signal to an amplifier;
step four: the inclined plane at the bottom edge of the cup body framework and the electric field can be prevented from effectively inhibiting secondary electrons from escaping out of the cup body assembly, and therefore the receiving efficiency of the Faraday cup receiver is improved.
The ceramic positioning block is made of an insulating material, and the influence of leakage current on measurement accuracy is inhibited. The outside of the cup body component is provided with a metal shielding shell for eliminating stray ion interference.
Claims (11)
1. A faraday cup receiver, comprising: the device comprises a shielding shell assembly (10), a suppression pole assembly (20), a cup body assembly (30) and a plurality of mounting screws; the suppressor assembly (20) and the cup assembly (30) are fixed inside the shielding shell assembly (10).
2. The faraday cup receiver of claim 1, wherein said shielding cage assembly (10) comprises: the shielding shell comprises a shielding shell framework (11), a fixed shielding plate (12), a limiting slit (13), a shielding shell inlet (14), a detachable shielding plate (15), a plurality of nuts (16) and a lead fixing groove (17), wherein the fixed shielding plate (12) is welded on the lower surface of the shielding shell framework (11); the shielding shell framework (11) is integrally of a C-shaped structure, and a shielding shell inlet (14) is formed in the opening end of the shielding shell framework (11); a limiting slit (13) is arranged on the inner surface of the shielding shell framework (11) close to the opening end; the other end of the shielding shell framework (11) is in threaded connection with a lead fixing groove (17); the detachable shielding plate (15) is connected to the upper surface of the shielding shell framework (11) through a plurality of nuts (16) in a threaded mode.
3. The Faraday cup receiver according to claim 2, wherein the shielding shell framework (11) is further symmetrically provided with a plurality of screw holes A (111) for mounting the detachable shielding plate on the upper surface; the side surface of the shielding shell framework (11) is also provided with a suppression pole lead hole (112) and a threaded hole (114) for fixing a receiver; the inner side surface of the shielding shell framework (11) is respectively provided with a suppression pole assembly mounting groove (113) and a cup body assembly mounting groove (117);
the side surface of the lead fixing groove (17) screwed on the shielding shell framework (11) is also respectively provided with a signal wire through hole (115) and a wire pressing threaded hole (116);
the suppressor component (20) is arranged in a suppressor component mounting groove (113) of the shielding shell component (10); the cup body assembly (30) is arranged in a cup body assembly mounting groove (117) of the shielding shell assembly (10).
4. The Faraday cup receiver according to claim 3, wherein a limiting slit (13) is further provided in the suppressor pole assembly mounting slot (113); the whole limiting slit (13) is of a rectangular plate-shaped structure, two ends of the limiting slit (13) are respectively provided with a folded edge (131), and the middle part of the limiting slit (13) is provided with a limiting seam (132); the shield shell inlet (14) is integrally of a plate-shaped structure, and the shield shell inlet (14) comprises: a positioning projection (141) and an inlet slit (142); the positioning protrusions (141) are arranged at two ends of the shielding shell inlet (14); the middle part of the shield shell inlet (14) is provided with an inlet slit (142); the width of the restriction slit (132) is smaller than the width of the entrance slit (142).
5. The Faraday cup receiver according to claim 4, wherein the fixed shielding plate (12) is a rectangular plate-shaped structure, a folding baffle A (121) is formed by bending one short side of the fixed shielding plate (12), and a shielding shell inlet positioning square hole (122) is formed at the bending position of the folding baffle A (121); the surface of the fixed shielding plate (12) is also uniformly provided with a plurality of screw holes B (123).
6. The Faraday cup receiver according to claim 5, wherein the detachable shielding plate (15) has a rectangular plate-like structure, a folding baffle B (151) is formed by bending one short side of the detachable shielding plate (15), and a shielding shell inlet positioning hole (152) is formed at the bending position of the folding baffle B (151); and a plurality of nut positioning holes (153) are uniformly formed in the surface of the detachable shielding plate (15).
7. The Faraday cup receiver according to claim 6, wherein the nut (16) is a cylinder, a threaded through hole (161) is formed at the center of the nut (16), and a nut (16) is arranged in each nut positioning hole (153) of the detachable shielding plate (15); the outer surface of the cylinder arranged on the nut (16) is welded and fixed with the inner surface of the nut positioning hole (153).
8. The faraday cup receiver of claim 7, wherein screw holes C (171) are further provided in said wire fixation slots (17).
9. The faraday cup receiver of claim 1, wherein said suppressor pole assembly (20) comprises: the device comprises a precision electrode (21), two positioning ceramic blocks (22), a suppression electrode lead (24) and a ceramic tube (23), wherein the positioning ceramic blocks (22) are fixedly arranged at two ends of the precision electrode (21), and the positioning ceramic block (22) at one end of the precision electrode (21) is connected with the ceramic tube (23); one end of the suppression pole lead wire (24) is welded with the precision electrode (21), and the other end of the suppression pole lead wire (24) penetrates out of the positioning ceramic block (22) and the ceramic tube (23).
10. The faraday cup receiver of claim 1, wherein said cup assembly (30) comprises: the cup body frame (31) and the cup body surrounding plate (32) are attached, spliced and fixed through welding, and the positioning pins (33) are arranged on the cup body frame (31) and the cup body surrounding plate (32); a positioning pin (33) is arranged on the side surface of the cup body framework (31); the positioning pin (33) is inserted into the inner part of the positioning ceramic block (22) for positioning connection.
11. The faraday cup receiver of claim 10, wherein said cup frame (31) is generally "C" -shaped; an air guide hole (312) is arranged on the upper surface of the bottom edge of the cup body framework (31); the inner surface of the bottom edge of the cup body framework (31) is provided with an inclined angle for inhibiting secondary electron rebound; the inclination angle is greater than 5 degrees; a plurality of positioning holes (311) are formed in the side surface of the cup body framework (31); the cup body enclosing plate (32) is integrally in a U-shaped plate structure, and a cup body inlet (321) is further formed in the bending part of the cup body enclosing plate (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023275491.0U CN214226860U (en) | 2020-12-30 | 2020-12-30 | Faraday cup receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023275491.0U CN214226860U (en) | 2020-12-30 | 2020-12-30 | Faraday cup receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214226860U true CN214226860U (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023275491.0U Active CN214226860U (en) | 2020-12-30 | 2020-12-30 | Faraday cup receiver |
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| Country | Link |
|---|---|
| CN (1) | CN214226860U (en) |
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2020
- 2020-12-30 CN CN202023275491.0U patent/CN214226860U/en active Active
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