A full digital two -dimensional conforms to the Doppler widening system

A Doppler broadening, all-digital technology, applied in the field of all-digital two-dimensional conforming Doppler broadening systems, can solve the problems of low ADC sampling rate accuracy and speed, long analog signal forming time, disadvantageous high count rate measurement, etc. To achieve the effect of simplifying the instrument structure, realizing the mobility, and realizing the miniaturization

Active Publication Date: 2022-08-05
WUHAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A full digital two -dimensional conforms to the Doppler widening system
  • A full digital two -dimensional conforms to the Doppler widening system
  • A full digital two -dimensional conforms to the Doppler widening system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] With the development of electronic technology, high-speed ADC and FPGA have been widely used. In the digital Doppler coincidence spread measurement system, the ADC is directly used to sample the pulse, and then it enters the FPGA digital processing platform for pulse shaping, baseline recovery, and accumulation identification. , amplitude extraction, time scaling, which 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 carried out to obtain a Doppler-broadened spectrum of coincidence 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 γ photons generated by positron annihilation, and to match the energy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to nuclear electronics technology, in particular to an all-digital two-dimensional coincidence Doppler broadening system, comprising first and second detectors and a host computer; also comprising first and second acquisition channels with the same structure, FPGA digital The processing platform and the Gigabit Ethernet port; the first and second detectors are respectively connected with the first and second acquisition channels, and the FPGA digital processing platform is respectively connected with the first and second acquisition channels and the Gigabit Ethernet port. The Ethernet port is connected with the upper computer. The system simplifies the system design by adopting a dual-channel all-digital acquisition circuit, and implements pulse extraction, time scaling and time coincidence analysis in FPGA. The ADC is directly used to sample the pulse, and then it enters the FPGA digital processing platform for pulse shaping, baseline recovery, stacking identification, amplitude extraction, and time scaling to improve the Doppler broadening spectrum peak-to-book ratio by 2-3 orders of magnitude.

Description

technical field [0001] The invention belongs to the technical field of nuclear electronics, in particular to an all-digital two-dimensional coincidence Doppler broadening system. Background technique [0002] Positron annihilation Doppler broadening measurement technology is an important technical means to study the internal microstructure and atomic-level defects of materials. Positron annihilation spectroscopy studies vacancy-type defects based on the information of electron density and electron momentum density brought by annihilation radiation. The low-momentum part of the Doppler-broadened 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 the core electrons. Because the core electrons have specific binding energies to the nucleus, the high-momentum components of the annihilation radiation carry very detaile...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/00G01T1/36
CPCG01N23/00G01T1/36
Inventor 王柱张梦新廖远黄启俊
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap