阅读说明：本技术 一种辐照加速器电子束流的在线扫描参数检测系统 (Online scanning parameter detection system for electron beam of irradiation accelerator ) 是由 单云 谭松清 黄敬松 张海龙 王复涛 于 2020-06-15 设计创作，主要内容包括：本发明公开了一种一种辐照加速器电子束流的在线扫描参数检测系统,包括测量模块以及数字转换及发送模块,所述数字转换及发送模块用于将测量模块上截获的电流强度模拟信号转换为数字信号,所述数字转换及发送模块通过屏蔽线缆与PC机终端进行通信,所述测量模块包括能量测量模块和均匀度测量模块,且都处于射线束的运动轨迹上,在射线扫描检测区域,能量测量模块用于测量射线能量,均匀度测量模块用于测量均匀度；本发明提供的一种辐照加速器电子束流的在线扫描参数检测系统,能够同时自动测量电子束流扫描范围下能量和均匀度参数。(The invention discloses an online scanning parameter detection system of an electron beam of an irradiation accelerator, which comprises a measuring module and a digital conversion and sending module, wherein the digital conversion and sending module is used for converting current intensity analog signals intercepted on the measuring module into digital signals, the digital conversion and sending module is communicated with a PC terminal through a shielding cable, the measuring module comprises an energy measuring module and an evenness measuring module, the energy measuring module and the evenness measuring module are positioned on the motion trail of a ray beam, the energy measuring module is used for measuring ray energy in a ray scanning detection area, and the evenness measuring module is used for measuring evenness; the online scanning parameter detection system for the electron beam of the irradiation accelerator provided by the invention can automatically measure the energy and uniformity parameters within the electron beam scanning range at the same time.)

1. An irradiation accelerator electron beam online scanning parameter detection system is characterized in that: including measuring module and digital conversion and sending module, digital conversion and sending module are used for converting the current strength analog signal who intercepts on the measuring module into digital signal, digital conversion and sending module communicate with PC terminal through the shielding cable, measuring module includes energy measuring module and degree of consistency measuring module, and all is in on the movement track of bundle of rays, and at ray scanning detection area, energy measuring module is used for measuring the ray energy, and degree of consistency measuring module is used for measuring the degree of consistency.

2. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 1, wherein: the energy measuring module and the uniformity measuring module move the energy measuring module and the uniformity measuring module out of the irradiation range of rays through an automatic recovery device.

3. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 2, wherein: the energy measurement module comprises an installation bottom plate and a plurality of copper plates, the copper plates are distributed on the axis of a ray bundle in a ray scanning detection area at equal intervals and used for measuring ray energy, and the copper plates are led out to a connector of the digital conversion and sending module through thin wires.

4. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 3, wherein: the uniformity measuring module comprises a plurality of copper plates, the copper plates are distributed on the reference surface at equal intervals to form a distribution target for measuring beam distribution in the scanning width of the scanning window of the electronic accelerator device, and the copper plates are respectively led out to a connector of the digital conversion and sending module through thin wires.

5. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 4, wherein: the digital conversion and transmission module comprises a numerical control analog switch, a high-speed ADC module, binding posts with the same number with the copper plates, an A/AMP current amplifier and TIA current-voltage converters, wherein each binding post is respectively connected with the input end of the corresponding TIA current-voltage converter through the A/AMP current amplifier, the output end of each TIA current-voltage converter is connected with the numerical control analog switch, and the numerical control analog switch transmits a digital signal to a PC terminal through the high-speed ADC module.

6. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 5, wherein: the number of the copper plates of the energy measurement module is 8, each copper plate is 0.5mm, and the width of each copper plate is 150 mm.

7. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 6, wherein: the number of the copper plates of the uniformity measuring module is 9-16, the width of the copper plates is 15mm, and the thickness of the copper plates is 4 mm.

8. The system for detecting the on-line scanning parameters of the electron beam current of the irradiation accelerator as claimed in claim 7, wherein: the automatic recovery device comprises a motor and a conveying line driven by the motor, and the conveying line supports and conveys the measuring module arranged on the conveying line.

Technical Field

The scheme relates to an online scanning parameter detection device for electron beams, belongs to the technical field of accelerator equipment detection, and particularly relates to an online scanning parameter detection system for electron beams of an irradiation accelerator.

Background

An electron accelerator is an electromagnetic device that accelerates electrons in a vacuum to high energy using a strong electric field, and accelerated particles are electrons, which are widely used in various fields in social life. The industrial irradiation accelerator is an electron accelerator which is built in industrial enterprises and is mainly used for irradiating various materials, participating in chemical reactions, carrying out sterilization and other industrial production processes.

The intensity, energy spectrum distribution and scanning uniformity of the output beam of the electron accelerator directly influence the irradiation effect of the irradiated object, the accelerator scans the electron beam outside the output window, the ray of the electron contained in the electron beam is not consistent in the incident angle on the plane due to the scanning deflection at different positions except the axis of the titanium window, and the technical performance of the electron accelerator equipment is difficult to avoid generating slow drift and change in the operation process, so a device for measuring the output beam parameters of the accelerator at any time in an access mode without stopping the machine is needed. At present, an electronic linear accelerator for industrial irradiation is inconvenient to test output beam current, beam current energy spectrum and scanning uniformity. The prior art for measuring the beam current energy spectrum is mainly deduced by measuring the electron range of an electron beam in a three-dimensional water tank, a wedge-shaped or step-shaped aluminum block or polystyrene, and cannot directly obtain the relevant information of the irradiated electron beam current.

The latter Chinese patent application, "method and apparatus for monitoring electron beam energy and irradiation system and method" (publication number 101435875) "discloses" a device for monitoring electron beam energy, but firstly the device has single detection parameter, secondly the device is installed at the edge of titanium window, and can not reflect the irradiation electron beam energy of electron accelerator on line. In addition, the invention of Chinese patent publication No. CN 102426382B, "measuring device of beam parameter output by electron accelerator", is a measuring device of beam parameter output by electron accelerator, which has a plurality of electron absorption bars insulated from other parts and having the same rectangular cross section and parallel to the electron absorption plate, the length direction is parallel to the width direction of the scanning output window of the accelerator, the side surfaces of the electron absorption bars with the same width are vertical to the electron ray direction; each electron absorption plate and each electron absorption rod are connected to a current metering device "through a lead. However, the electron absorption plate for measuring the beam energy and the electron absorption bar for measuring the unevenness can affect each other, and the measuring device can shield useful electron beams when the accelerator works, so that the measuring device needs to be moved away and cannot measure on line.

Disclosure of Invention

The technical scheme adopted by the invention for solving the technical problems is to provide an online scanning parameter detection system for an electron beam of an irradiation accelerator, which aims to overcome the defects that the size of a measuring rod is large, a plurality of analog signal cables are arranged, the measurement is easy to interfere, the simultaneous measurement of energy and uniformity parameters cannot be realized, the measurement reading is artificially recorded, the subjectivity is high, the measurement accuracy is not favorable, and the like in the conventional measurement method.

The scanning parameter detection device for the electron beam current can automatically measure the current intensity intercepted on the copper plates at different positions under the scanning width of the electron beam current at almost the same time, display and record the measured data, and transmit the measured data to a PC (personal computer) and a terminal.

The specific technical scheme is as follows:

including measuring module and digital conversion and sending module, digital conversion and sending module are used for converting the current strength analog signal who intercepts on the measuring module into digital signal, digital conversion and sending module communicate with PC terminal through the shielding cable, measuring module includes energy measuring module and degree of consistency measuring module, and all is in on the movement track of bundle of rays, and at ray scanning detection area, energy measuring module is used for measuring the ray energy, and degree of consistency measuring module is used for measuring the degree of consistency.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the energy measuring module and the uniformity measuring module can move the energy measuring module and the uniformity measuring module out of the irradiation range of the rays through an automatic recovery device.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the energy measurement module comprises an installation bottom plate and a plurality of copper plates, the copper plates are distributed on the axis of a ray bundle in a ray scanning detection area at equal intervals and used for measuring ray energy, and the copper plates are led out to a connector of the digital conversion and sending module through thin wires.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the uniformity measuring module comprises a plurality of copper plates, the copper plates are distributed on the reference surface at equal intervals to form a distribution target for measuring beam distribution in the scanning width of the scanning window of the electronic accelerator device, and the copper plates are respectively led out to a connector of the digital conversion and sending module through thin wires.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the digital conversion and transmission module comprises a numerical control analog switch, a high-speed ADC module, binding posts with the same number with the copper plates, an A/AMP current amplifier and TIA current-voltage converters, wherein each binding post is respectively connected with the input end of the corresponding TIA current-voltage converter through the A/AMP current amplifier, the output end of each TIA current-voltage converter is connected with the numerical control analog switch, and the numerical control analog switch transmits a digital signal to a PC terminal through the high-speed ADC module.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the number of the copper plates of the energy measurement module is 8, each copper plate is 0.5mm, and the width of each copper plate is 150 mm.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the number of the copper plates of the uniformity measuring module is 9-16, the width of the copper plates is 15mm, and the thickness of the copper plates is 4 mm.

The above-mentioned online scanning parameter detecting system of irradiation accelerator electron beam current, wherein: the automatic recovery device comprises a motor and a conveying line driven by the motor, and the conveying line supports and conveys the measuring module arranged on the conveying line.

Compared with the prior art, the invention has the following beneficial effects: the scanning parameter detection device for the electron beam current can automatically measure the energy and uniformity parameters in the scanning range of the electron beam current at the same time, convert the converted digital signals to be transmitted to the PC and the terminal, has the advantages of simplicity and convenience in operation, short measuring time, low measuring error, capability of avoiding adverse influence of human factors on measuring results, capability of storing and displaying data, convenience for observation of testers and the like, and has a good application prospect. Meanwhile, the measuring module is provided with an automatic withdrawing device, the ray scanning range can be removed after the measurement is finished, the unnecessary irradiation of rays is avoided, and the service life is prolonged.

Drawings

Fig. 1 is a schematic diagram of a use state of an online scanning parameter detection system for electron beams of an irradiation accelerator.

In the figure:

1 scanning window 2 energy measuring module 3 uniformity measuring module 4 automatic withdrawing device 5 digital conversion and sending module

Detailed Description

To the technical problem that this application scheme solved, current measurement method, the volume of aluminium bar is great, and it is more to draw forth the cable, and remote transmission analog signal, and the cable drops easily or is impaired, and analog signal also receives the interference easily. Meanwhile, the existing measuring method cannot carry out online measurement. This scheme changes the copper into the copper of changing the installation, and mounting dimension is littleer, and is more reliable. A signal conversion circuit and a circuit shielding assembly are arranged near the measuring copper plate, analog current signals are converted into digital signals, and the fact that analog signal multi-cable transmission is prone to interference and difficult to maintain is avoided. Through digital signal communication and PC terminal processing, the current intensity intercepted on the copper plates at different positions under the electronic beam current sweep can be automatically measured at almost the same time, and the measured data can be displayed and recorded. Meanwhile, the scanning area of the scanning electron beam is about 1m in the measuring length and is much larger than the area used for measuring the parameters, so that the measuring area is divided into two symmetrical parts, one part is used for measuring energy, and the other part is used for measuring the unevenness. Since the measuring device takes a more compact construction and is provided with cooling means for removing heat built up on the measuring device. Therefore, the measuring device can be arranged below the object to be irradiated, and online measurement is realized.