MCP detector

Abstract

The utility model discloses an MCP detector, which comprises a protective base, a positioning base is arranged in the protective base, the outer surface of the positioning base is in threaded connection with a gland, the center of the gland is provided with a circular-truncated-cone-shaped through hole, and the diameter of the circular-truncated-cone-shaped through hole is gradually reduced from top to bottom. The positioning base is sequentially provided with a first pressing sheet, a grid mesh, a second pressing sheet, a first micro-pass ion plate and a second micro-pass ion plate from top to bottom, and two groups of circuit boards symmetrically arranged along the center of the second micro-pass ion plate at intervals are arranged at the bottom of the second micro-pass ion plate. According to the utility model, the protection base and the positioning base and the gland which are in threaded connection are mounted, so that the detection element in the detector is protected, and the grid mesh is arranged to shield the electric field of the micro-pass ion plate, so that the influence on the detection result caused by interference in the detector is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of mass spectrometer detectors, and particularly relates to an MCP detector. Background Art

[0002] A microchannel plate (MCP) is a two-dimensional planar array of electron multiplication detectors composed of many micron-sized electron multiplier tubes (microchannels) arranged in parallel. It is usually used to detect charged particles such as electrons or ions, and can also detect high-speed neutral particles, as well as photons in the ultraviolet and X-ray ranges. Due to the electron multiplication effect of the microchannel (the gain of a single tube can reach more than 1000 times), many parallel and independent microchannel arrays on the microchannel plate provide the microchannel plate with micron-level spatial resolution, so it is not only widely used in particle detection (ions, electrons or short-wavelength photons), but also for analyzing the spatial position information of these particles.

[0003] In traditional microchannel application cases, including some commercial products, the particle detection system composed of microchannel plates is exposed in a vacuum chamber. This application mode has been widely used in DC electric fields and short-wavelength photon detection. However, if there is a strong interference source near the particle detection system composed of the microchannel plate, such as radio frequency electric field, pulsed high-voltage electric field, etc., due to its high gain characteristics, it will produce a strong interference signal output. These interference signals are sometimes stronger than the real particle signal, and even reach several times the particle signal strength; in addition, the metal electrodes, connecting wires, and voltage-dividing resistors in the microchannel plate particle detection system will also generate induced potentials under the action of interference sources, resulting in corresponding background noise. Utility Model Content

[0004] The utility model provides an MCP detector, which can effectively solve the above problems.

[0005] The utility model is achieved in this way:

[0006] An MCP detector, comprising:

[0007] A protective base, wherein a positioning base is installed inside the protective base, a pressure cover is threadedly connected to the outer surface of the positioning base, a truncated cone-shaped through hole with a diameter gradually decreasing from top to bottom is arranged at the center position of the pressure cover, and the positioning base is provided with a first pressing plate, a grid, a second pressing plate, a first micro-ion plate and a second micro-ion plate in sequence from top to bottom, and two groups of circuit boards symmetrically spaced along the center of the second micro-ion plate are arranged at the bottom of the second micro-ion plate, a signal lead-out connector is arranged between the two groups of circuit boards, and the signal lead-out connector extends out of the positioning base and is located in the central cavity of the protective base.

[0008] As a further improvement, an insulating groove is preset at the bottom of the protective base, an insulating sleeve is installed in the insulating groove, and the power supply lead-in line of the circuit board passes through the bottom of the positioning base and extends into the interior of the insulating sleeve.

[0009] As a further improvement, an insulating layer is provided on the inner side wall of the positioning base.

[0010] As a further improvement, the first micro-ion plate and the second micro-ion plate have the same structure and are both provided with a circular microchannel area in the middle, the upper part of the first micro-ion plate is an ion inlet, the lower part of the second micro-ion plate is an ion outlet, the size of the ion inlet is smaller than the size of the first micro-ion plate, the size of the ion outlet is smaller than the size of the second micro-ion plate, and the size of the ion inlet is larger than the size of the ion outlet.

[0011] As a further improvement, a first electrode plate is placed on the first micro-ion plate, a second electrode plate is placed between the first micro-ion plate and the second micro-ion plate, and a third electrode plate is placed under the second micro-ion plate.

[0012] As a further improvement, the circuit board includes a first voltage-dividing resistor, a second voltage-dividing resistor and an anode plate, the anode plate, the second voltage-dividing resistor and the second voltage-dividing resistor are connected in series in sequence, the first electrode plate is electrically connected to the wire between the anode plate and the first voltage-dividing resistor, the second electrode plate is electrically connected to the wire between the first voltage-dividing resistor and the second voltage-dividing resistor, and the third electrode plate is electrically connected to the wire between the second voltage-dividing resistor and the negative pole of the power supply lead-in wire.

[0013] The beneficial effects of the utility model are as follows: by installing a protective base and a threaded positioning base and a pressure cover, the detection elements inside the detector are protected, and secondly, by setting a grid, the electric field of the micro-pass ion plate is shielded, thereby avoiding interference inside the detector and affecting the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic front view of the overall structural section of the utility model;

[0016] Figure 2It is an exploded schematic diagram of the overall structure of the utility model;

[0017] Reference numerals:

[0018] 1-protective base, 2-positioning base, 3-insulating layer, 4-pressure cover, 5-first pressure plate, 6-first micro-pass ion plate, 7-circuit board, 8-signal lead-out connector, 9-power lead-in wire, 10-insulating sleeve, 11-grid, 12-second micro-pass ion plate, 13-cone-shaped through hole. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0020] In the description of the present invention, the terms "upper", "lower", "above", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] Reference Figure 1-2 As shown, this embodiment provides an MCP detector, including:

[0022] A protective base 1, wherein a positioning base 2 is installed inside the protective base 1, a pressure cover 4 is threadedly connected to the outer surface of the positioning base 2, a truncated cone-shaped through hole 13 with a diameter gradually decreasing from top to bottom is provided at the center position of the pressure cover 4, and the positioning base 2 is provided with a first pressing plate 5, a grid 11, a second pressing plate, a first micro-ion plate 6 and a second micro-ion plate 12 from top to bottom, and two groups of circuit boards 7 are arranged symmetrically at intervals along the center of the second micro-ion plate 12 at the bottom, and a signal lead-out connector 8 is arranged between the two groups of circuit boards 7, and the signal lead-out connector 8 extends out of the positioning base 2 and is located in the central cavity of the protective base 1.

[0023] By installing a protective base 1 and a threaded positioning base 2 and a pressure cover 4, the detection elements inside the detector are protected. Secondly, by setting a grid 11, the electric field of the micro-pass ion plate is shielded to avoid interference inside the detector and thus avoid affecting the detection results. Finally, the ions are amplified by the first micro-pass ion plate 6 and the second micro-pass ion plate 12, so that the number of electrons generated is hundreds of times that of the original ions entering, making it easier for the ion signal to be collected by the data acquisition card, and ensuring high collection sensitivity and better collection effect.

[0024] Furthermore, an insulating groove is preset at the bottom of the protective base 1, and an insulating sleeve 10 is installed in the insulating groove. The power supply lead-in wire 9 of the circuit board 7 passes through the bottom of the positioning base 2 and extends into the insulating sleeve 10.

[0025] By providing the insulating sleeve 10 and placing the power lead-in wire 9 inside the insulating sleeve 10, electrical conduction of the power lead-in wire 9 to the protective base 1 is avoided, and the problem of noise inside the detector during the detection process affecting the detection result is also avoided.

[0026] Furthermore, an insulating layer 3 is provided on the inner side wall of the positioning base 2 .

[0027] The insulating layer 3 is provided to avoid the phenomenon of electrical conduction in the detection element inside the positioning base 2, which would cause the positioning base 2 to be charged and affect the ion detection.

[0028] Furthermore, the first micro-ion plate 6 and the second micro-ion plate 12 have the same structure and are both provided with a circular microchannel area in the middle, the upper part of the first micro-ion plate 6 is an ion inlet, and the lower part of the second micro-ion plate 12 is an ion outlet, the size of the ion inlet is smaller than the size of the first micro-ion plate 6, the size of the ion outlet is smaller than the size of the second micro-ion plate 12, and the size of the ion inlet is larger than the size of the ion outlet.

[0029] Since the angles at which ions enter the micro-ion plate through the ion inlet are different, in order to ensure that the incident ions enter the first micro-ion plate 6 as much as possible, the size of the ion inlet should not be much smaller than the size of the first micro-ion plate 6, and in order to ensure that the incident ions can pass through the ion outlet as much as possible to be collected by the data acquisition card, the size of the ion outlet should be smaller than the size of the second micro-ion plate 12, and the size of the ion inlet should be larger than the size of the ion outlet.

[0030] Furthermore, a first electrode plate is placed on the first micro-ion plate 6 , a second electrode plate is placed between the first micro-ion plate 6 and the second micro-ion plate 12 , and a third electrode plate is placed under the second micro-ion plate 12 .

[0031] By setting the first electrode plate, the second electrode plate and the third electrode plate, and the negative pressure differences of the three groups of electrode plates are different, a pressure difference is generated on both sides of each micro-pass ion plate, which facilitates electrons to be accelerated again and fly out of the micro-pass ion plate.

[0032] The circuit board 7 includes a first voltage-dividing resistor, a second voltage-dividing resistor and an anode plate, wherein the anode plate, the second voltage-dividing resistor and the second voltage-dividing resistor are connected in series in sequence, the first electrode plate is electrically connected to the wire between the anode plate and the first voltage-dividing resistor, the second electrode plate is electrically connected to the wire between the first voltage-dividing resistor and the second voltage-dividing resistor, and the third electrode plate is electrically connected to the wire between the second voltage-dividing resistor and the negative pole of the power supply lead-in line 9.

[0033] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An MCP detector, characterized in that: include: A protective base, wherein a positioning base is installed inside the protective base, a pressure cover is threadedly connected to the outer surface of the positioning base, a truncated cone-shaped through hole with a diameter gradually decreasing from top to bottom is arranged at the center position of the pressure cover, and the positioning base is provided with a first pressing plate, a grid, a second pressing plate, a first micro-ion plate and a second micro-ion plate in sequence from top to bottom, and two groups of circuit boards symmetrically spaced along the center of the second micro-ion plate are arranged at the bottom of the second micro-ion plate, a signal lead-out connector is arranged between the two groups of circuit boards, and the signal lead-out connector extends out of the positioning base and is located in the central cavity of the protective base.

2. The MCP detector according to claim 1, characterized in that An insulating groove is preset at the bottom of the protective base, an insulating sleeve is installed in the insulating groove, and the power lead-in wire of the circuit board passes through the bottom of the positioning base and extends into the interior of the insulating sleeve.

3. The MCP detector according to claim 1, characterized in that An insulating layer is arranged on the inner side wall of the positioning base.

4. The MCP detector according to claim 1, characterized in that: The first micro-ion plate and the second micro-ion plate have the same structure and are both provided with a circular microchannel area in the middle. The upper part of the first micro-ion plate is an ion inlet, and the lower part of the second micro-ion plate is an ion outlet. The size of the ion inlet is smaller than that of the first micro-ion plate, the size of the ion outlet is smaller than that of the second micro-ion plate, and the size of the ion inlet is larger than that of the ion outlet.

5. The MCP detector according to claim 1, characterized in that: A first electrode plate is placed on the first micro-ion plate, a second electrode plate is placed between the first micro-ion plate and the second micro-ion plate, and a third electrode plate is placed under the second micro-ion plate.

6. The MCP detector according to claim 5, characterized in that: The circuit board includes a first voltage-dividing resistor, a second voltage-dividing resistor and an anode plate, wherein the anode plate, the second voltage-dividing resistor and the second voltage-dividing resistor are connected in series in sequence, the first electrode plate is electrically connected to the wire between the anode plate and the first voltage-dividing resistor, the second electrode plate is electrically connected to the wire between the first voltage-dividing resistor and the second voltage-dividing resistor, and the third electrode plate is electrically connected to the wire between the second voltage-dividing resistor and the negative pole of the power supply lead-in wire.

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