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All-digital two-dimensional coincident Doppler broadening system

A Doppler widening and all-digital technology, which is applied in the field of all-digital two-dimensional coincident Doppler widening systems, can solve the problems of low ADC sampling rate accuracy and speed, long analog signal shaping time, unfavorable high count rate measurement, etc. Achieve the effect of simplifying the instrument configuration, realizing portability and miniaturization

Active Publication Date: 2019-09-24
WUHAN UNIV
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Problems solved by technology

However, because the analog signal takes a long time to form, it is easy to generate accumulation, which is not conducive to high count rate measurement; at the same time, the accuracy and speed of the ADC sampling rate are low, so that the resolution of the energy spectrum is low

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  • All-digital two-dimensional coincident Doppler broadening system
  • All-digital two-dimensional coincident Doppler broadening system
  • All-digital two-dimensional coincident Doppler broadening system

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Embodiment Construction

[0015] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] With the development of electronic technology, high-speed ADCs and FPGAs have been widely used. In the digital Doppler coincidence stretching measurement system, ADCs are used to directly sample pulses, and then enter the FPGA digital processing platform for pulse shaping, baseline restoration, and accumulation recognition. , amplitude extraction, and time calibration can improve the count rate and energy resolution of the system. The two-channel signals are sampled by ADC and processed by FPGA respectively, and then the energy and time coincidence are performed to obtain coincident Doppler broadening spectrum with extremely low background and further improved energy resolution.

[0017] The idea of ​​the technical solution in this embodiment is to measure a pair of gamma photons generated by positron annihilation, and to perform coincidence in ...

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Abstract

The invention relates to the nuclear electronics technology, in particular to an all-digital two-dimensional coincident Doppler broadening system, comprising a first detector, a second detector , a host computer, a first acquisition channel, a second acquisition channel, an FPGA digital processing platform and a gigabit Ethernet port. The first acquisition channel and the second acquisition channel have the same structures. The first detector and the second detector are connected with the first acquisition channel and the second acquisition channel respectively. The FPGA digital processing platform is respectively connected with the first and second acquisition channels and the gigabit Ethernet port; and the gigabit Ethernet port is connected to the host computer. According to the system, the system design is simplified by using the dual-channel all-digital acquisition circuit; and the pulse extraction, time calibration, and time coincident analysis are realized in the FPGA. The ADC is used directly to carry out pulse sampling and then pulse shaping, baseline recovery, stack identification, amplitude extraction, and time calibration are performed by entering the FPGA digital processing platform, so that the peak-to-background ratio of the Doppler broadening spectrum is increased by 2 to 3 magnitude order.

Description

technical field [0001] The invention belongs to the technical field of nuclear electronics, in particular to an all-digital two-dimensional coinciding Doppler broadening system. Background technique [0002] Positron annihilation Doppler broadening measurement technology is an important technical means to study the microstructure and atomic-level defects inside materials. Positron annihilation spectroscopy to study vacancy defects is based on the information of electron density and electron momentum density brought out by annihilation radiation. The low-momentum part of the Doppler broadening spectrum corresponds to the momentum information of the annihilation of positrons and conduction electrons or valence electrons, while the high-momentum part mainly reflects the momentum distribution information of core electrons. Since core electrons have specific binding energies to atomic nuclei, the high-momentum component of annihilation radiation carries very detailed information...

Claims

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Application Information

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IPC IPC(8): G01N23/00G01T1/36
CPCG01N23/00G01T1/36
Inventor 王柱张梦新廖远黄启俊
Owner WUHAN UNIV
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