System performances of optical space code-division multiple-access-based fiber-optic two-dimensional parallel data link

System performances of optical space code-division multiple-access-based fiber-optic two-dimensional parallel data link

Citation

B.S. Moon, C.E. Chung, J.W. Lee, S.B. Hong, Y.K. Kim, J.Y. Kim, W.K. Lee, S.H. Han, J.S. Lee, W.K. Lee, S.H. Cheon, K.S. Kim, J.H. Back, H. Bae, W.S. Kang, Y.C. Jung, J.S. Kim, H.S. Cho, S.M. Kang and D.K. Hong, “Development of Gas Electron Multiplier (GEM) for Digital Radiographic System,” Korea Atomic Energy Research Institute, Taejon (2000).

Keywords

  • GEM (Gas Electron Multiplier)
  • Digital Radiography
  • Micro-Channel Plate (MCP)
  • EGS4
  • CsI (Cesium Iodide)
  • Spatial Resolution
  • MAXWELL
  • Photo-converter
  • Ar/Xe Gas
  • Readout Circuit

Brief

This article details the development and testing of a prototype GEM (Gas Electron Multiplier) detector for use in digital radiography systems.
The publisher is the Korea Atomic Energy Research Institute.

Summary

This research report focuses on the development of a Gas Electron Multiplier (GEM) detector for digital radiographic systems. The report highlights the potential of GEM detectors as a cost-effective alternative to conventional digital radiography (DR) systems, offering advantages like high spatial resolution, time resolution, and detection efficiency.
The researchers designed a prototype GEM detector, utilizing simulation codes like EGS4 and MAXWELL to optimize parameters such as gas layer thickness and X-ray energy levels for achieving 100-micron resolution. They also developed a multi-channel readout circuit to handle the large signal output of the GEM detector.

Key aspects of the research include:

  • Analyzing the spatial resolution of X-ray images.
  • Estimating the radial movement of photons in photo-converters.
  • Analyzing the photo-conversion characteristics of CsI and Ar/Xe gas.
  • Designing multi-channel readout circuits.
  • Analyzing the electric field characteristics of GEM detectors.
  • Fabricating a prototype GEM detector, including the detector chamber, gas system, and readout plate.
  • Testing the prototype detector with an Fe-55 source to determine gas gain, charge sharing, and transparency.

The report concludes that the prototype GEM detector shows promising results and can potentially be utilized in various applications such as inspecting small electronic components, semiconductor interiors, and cathode ray tube coils. Further research is suggested to improve image acquisition speed and accuracy, including the potential development of a tapered fiber optic plate combined with a CCD imaging system.

Origin: https://cds.cern.ch/record/747068/files/34081271.pdf

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