Device for leading out cathode nuclear signal of proportional counter tube

Abstract

The utility model discloses a device for leading out a cathode nuclear signal of a proportional counter tube, and belongs to the technical field of nuclear detection. In order to solve the technical problem that the measurement precision is influenced by signal distortion easily caused by leading out nuclear signals from the anode of the existing proportional counter tube, the utility model mainly adopts a mode of leading out nuclear signals from the cathode of the proportional counter tube, and is provided with a first signal joint, a second signal joint, a third signal joint and a metal shielding shell in a matched manner. According to the utility model, complete output and electromagnetic interference suppression of nuclear signals can be realized, and signal quality and device stability are improved.

Description

Technical Field

[0001] This utility model relates to a device for extracting nuclear signals from the cathode of a proportional counter tube, belonging to the field of nuclear detection technology. Background Technology

[0002] A proportional counter tube is a gas detector that can be filled with different types of sensitive gases and is commonly used for detecting neutron rays. In operation, a high positive voltage is applied to the tube, creating a spatial electric field inside. The outer wall of the tube acts as the cathode, while a thin filament drawn inside acts as the anode.

[0003] Some existing proportional counters (see Jiang Bo and Wu Wenchao, “Development of an Anti-interference Boron-Coated Proportional Counter”, Instrument and Meter User, 2020, 27(03):61-64; Yang Daoguang and Lu Shuangtong, “Spherical…”) 3 In the paper "Development of He Proportional Counter Tube", Nuclear Electronics & Detection Technology, 2014, 34(04):521-525, the anode wire is used not only for high voltage feed but also as the lead-out terminal for nuclear signals. To prevent the high voltage from affecting the downstream electronic circuits, a DC blocking capacitor is usually placed at the front end of the electronics. However, this type of scheme based on the anode to lead out nuclear signals has a deficiency, namely, the original nuclear signal will be distorted when passing through the DC blocking capacitor, thereby changing its original time characteristics and amplitude characteristics. Utility Model Content

[0004] The purpose of this invention is to provide a device for extracting the nuclear signal from the cathode of a proportional counter tube, so as to solve the problem of signal distortion caused by the DC blocking capacitor in the existing anode extraction method, which affects the time and amplitude characteristics of the nuclear signal.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A device for extracting signals from the cathode nucleus of a proportional counter tube includes:

[0007] Shielding shell, proportional counter tube, first signal connector, second signal connector and third signal connector

[0008] The proportional counter tube is disposed inside the shielding shell. The proportional counter tube includes an anode wire and a cathode shell, and is filled with a neutron nuclear reaction sensitive gas.

[0009] The first signal connector is mounted on the cover of the shielding shell for connecting an external electronic unit;

[0010] The second signal connector is installed on the cover of the shielding shell and is used to connect an external high-voltage power supply module;

[0011] The third signal connector is disposed between the proportional counter tube and the first and second signal connectors. The third signal connector includes a signal wire and a shielding mesh. One end of the signal wire is connected to the anode wire, and the other end is connected to the signal wire of the second signal connector. One end of the shielding mesh is connected to the cathode housing, and the other end is connected to the signal wire of the first signal connector.

[0012] Furthermore, the shielding shell has a cylindrical structure and is made of aluminum.

[0013] Furthermore, the cover of the shielding shell is connected to the main body of the shielding shell by a snap-fit ​​connection.

[0014] Furthermore, the first signal connector is an SMA type connector.

[0015] Furthermore, the second signal connector is an MHV type connector.

[0016] Furthermore, the third signal connector is an MHV or SHV type connector.

[0017] Furthermore, the neutron nuclear reaction-sensitive gas filled in the proportional counter tube is BF3 or... 3 He.

[0018] Furthermore, the third signal connector is fixed to the proportional counter tube by a screw-button connection.

[0019] The beneficial effects achieved by this utility model are as follows:

[0020] 1. This utility model avoids the signal distortion problem caused by DC blocking capacitor in the traditional anode extraction method by extracting the nuclear signal from the cathode of the proportional counter tube, and can effectively preserve the original time characteristics and amplitude characteristics of the nuclear signal.

[0021] 2. The present invention provides a metal shielding shell outside the proportional counter tube, which can enhance the device's ability to suppress external electromagnetic interference, improve the stability of signal transmission, and enhance the reliability of device operation.

[0022] 3. Through the structural design and layout of the first, second and third signal connectors, this utility model achieves effective isolation between the high-voltage power supply path and the signal output path. The assembly structure is compact and facilitates modular integration and maintenance. Attached Figure Description

[0023] Figure 1 This is a front view of the device for extracting the cathode nucleus signal of the proportional counter tube in the embodiment.

[0024] Figure 2 yes Figure 1 A cross-sectional view along AA of the device from which the cathode nucleus signal of the proportional counter tube is extracted.

[0025] Figure 3 This is a right view of the device for extracting the cathode nucleus signal from the proportional counter tube in the embodiment.

[0026] In the diagram: 1-Shielding shell, 11-Cover body, 2-Proportional counter tube, 21-Anode wire, 22-Cathode shell, 3-First signal connector, 4-Second signal connector, 5-Third signal connector. Detailed Implementation

[0027] To make the various technical features, advantages, or effects of the present invention more apparent and understandable, detailed descriptions are provided below through embodiments.

[0028] This embodiment discloses a device for extracting the cathode core signal of a proportional counter tube, the structure of which is as follows: Figures 1 to 3 As shown, it includes: a shielding shell 1, a proportional counter tube 2, a first signal connector 3, a second signal connector 4, and a third signal connector 5.

[0029] The shielding shell 1 can be cylindrical in shape, preferably made of aluminum, which has good electromagnetic shielding performance. The cover 11 of the shielding shell 1 is provided with a first signal connector 3 and a second signal connector 4.

[0030] The proportional counter tube 2 has an anode wire 21 and a cathode housing 22 inside, and is filled with a neutron nuclear reaction sensitive gas, such as BF3 or 3 He is used for the detection of neutron rays.

[0031] The first signal connector 3 is an SMA type connector, with internal signal wires (not shown in the figure) for outputting the cathode nuclear reaction signal of the proportional counter tube 2 and connecting it to the back-end electronics unit.

[0032] The second signal connector 4 is an MHV type high-voltage connector with a withstand voltage rating of 3000V. It has an internal signal wire (not shown in the figure) for transmitting high-voltage electricity to the proportional counter tube 2 and connecting to the external high-voltage module.

[0033] The third signal connector 5 can be of type MHV or SHV and is fixed to the proportional counter tube 2 by a screw-button connection. The third signal connector 5 contains a signal wire and a shielding mesh (neither shown in the figure). One end of its signal wire is connected to the anode wire 21 of the proportional counter tube 2, and the other end is connected to the signal wire of the second signal connector 4; one end of its shielding mesh is connected to the cathode housing 22 of the proportional counter tube 2, and the other end is connected to the signal wire of the first signal connector 3.

[0034] The installation process of this device includes the following steps:

[0035] 1. Install the first signal connector 3 and the second signal connector 4 onto the cover 11 of the shielding shell 1, respectively;

[0036] 2. Install the third signal connector 5 that is compatible with the proportional counter tube 2;

[0037] 3. Install the proportional counter tube 2 and the third signal connector 5 into the shielding shell 1 as a whole;

[0038] 4. Use a high-voltage resistant wire to electrically connect the signal wire of the third signal connector 5 to the signal wire of the second signal connector 4;

[0039] 5. Use a standard signal cable to electrically connect the shielding mesh of the third signal connector 5 to the signal wire of the first signal connector 3;

[0040] 6. Fasten and fix the cover 11 of the shielding shell 1 to the shell body to complete the assembly.

[0041] The working principle of this device is as follows:

[0042] An external high-voltage power supply provides a positive high voltage (e.g., above 1000V) to the anode wire 21 of the proportional counter tube 2 through the signal wires inside the second signal connector 4 and the third signal connector 5, forming a high-voltage electric field inside the tube.

[0043] Meanwhile, the cathode housing 22 of the proportional counter tube 2 is connected to the back-end electronic measurement unit through the shielding mesh inside the first signal connector 3 and the third signal connector 5.

[0044] When neutron rays are incident on proportional counter tube 2, the neutrons undergo nuclear reactions with the sensitive gas inside the tube, producing positive and negative ion pairs. Under the influence of a high-voltage electric field, these ions move towards the anode and cathode respectively, forming a nuclear reaction current. This current is led out through the cathode housing 22 and transmitted to the back-end electronics system through the first signal connector 3, realizing the detection and measurement of neutron rays.

[0045] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any appropriate modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the protection scope of the present invention, which is defined by the claims.

Claims

1. A device for extracting signals from the cathode nucleus of a proportional counter tube, characterized in that, include: Shielding shell, proportional counter tube, first signal connector, second signal connector and third signal connector The proportional counter tube is disposed inside the shielding shell. The proportional counter tube includes an anode wire and a cathode shell, and is filled with a neutron nuclear reaction sensitive gas. The first signal connector is mounted on the cover of the shielding shell for connecting an external electronic unit; The second signal connector is installed on the cover of the shielding shell and is used to connect an external high-voltage power supply module; The third signal connector is disposed between the proportional counter tube and the first and second signal connectors. The third signal connector includes a signal wire and a shielding mesh. One end of the signal wire is connected to the anode wire, and the other end is connected to the signal wire of the second signal connector. One end of the shielding mesh is connected to the cathode housing, and the other end is connected to the signal wire of the first signal connector.

2. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The shielding shell has a cylindrical structure and is made of aluminum.

3. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The cover of the shielding shell is connected to the main body of the shielding shell by a snap-fit ​​connection.

4. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The first signal connector is an SMA type connector.

5. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The second signal connector is an MHV type connector.

6. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The third signal connector is an MHV or SHV type connector.

7. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The proportional counter tube is filled with a neutron nuclear reaction-sensitive gas, which is BF3 or... 3 He.

8. The device for extracting the cathode core signal of a proportional counter tube as described in claim 1, characterized in that, The third signal connector is fixed to the proportional counter tube by a screw-button connection.

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