Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Visualization of Permittivity Distribution in GFRP using Full-Field Scanning Free Space Measurement System

전영역 스캐닝 자유공간 측정 시스템을 이용한 GFRP의 유전율 분포 가시화

  • Hyun, Jong-Min (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Ahmed, Hasan (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Jung-Ryul (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2018.03.07
  • Accepted : 2018.05.09
  • Published : 2018.06.29
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Abstract

This paper visualizes the full-field permittivity distribution at the standard specimens having known electromagnetic characteristics using a scanning free space measurement (SFSM) system. First, in the two Teflon specimens with different thicknesses, the real and loss tangent of permittivity could be measured and the results agreed to the theoretical and other measurement values. Then the system has been applied to Glass/epoxy and visualized different permittivity distribution depending on the material kind. Therefore, this approach will overcome the point measurement limitation of FSM and can be used for even sub-structural full-field electromagnetic evaluation of stealth and radome structures.

본 연구에서는 스캐닝 자유공간 측정 시스템을 이용하여 전자기적 특성을 가지는 표준 시편에 대한 전영역 유전율 분포를 가시화한다. 먼저 테플론 두께 차이에 따라, 유전율 측정 결과, 유전율 실수와 손실정접 측정결과가 두께변화에도 타측정과 이론치와 비교하여 신뢰할 수 있는 결과를 획득하였고 이어 Glass/epoxy 시편에 적용하여 재료에 따라 다른 유전율 분포가 나타나는 것을 제시하였다. 스캔영역을 통해, 시편 전영역에 대한 유전율 분포를 가시화 할 수 있었으며, 재료 물성 평가를 넘어 레이돔 혹은 스텔스 구조 규모의 대상체에도 적용할 수 있음을 확인하였다.

Keywords

References

  1. Choi, J.H., Nam, Y.W., Kim, C.G., and Lee, W.J., "Microwave Absorbing Structure Using Semiconductive Fiber Reinforced Composite," Journal of the Korean Society for Composite Materials, Vol. 29, No. 3, 2016, pp. 98-103.
  2. Son, D.S., Hyun, J.M., Lee, J.R., and Lee, W.J., "Optimization of the Design of Radar-Absorbing Composite Structures using Response Surface Model with Verification using Scanning Free Space Measurement," Journal of Composite Structures, Vol. 186, 2018, pp. 106-113. https://doi.org/10.1016/j.compstruct.2017.11.075
  3. Lederer, P.G., An Introduction to Radar Absorbent Materials (RAM), Royal Signals and Radar Establishment, London, 1986.
  4. Panwar, R., and Lee, J.R., "Progress in Frequency Selective Surface-Based Smart Electromagnetic Structures: A Critical Review," Journal of Aerospace Science and Technology, Vol. 66, 2017, pp. 216-234. https://doi.org/10.1016/j.ast.2017.03.006
  5. Ghodgaonkar, D.K., Varadan, V.V., and Varadan, V.K., "Free-Space Measurement of Complex Permittivity and Complex Permeability of Magnetic Materials at Microwave Frequencies," IEEE Transactions on Instrumentation and Measurement, Vol. 39, No. 2, 1990, pp. 387-394. https://doi.org/10.1109/19.52520
  6. Hyun, J.M., Ahmed, H., and Lee, J.R., "Development of Dual Port Scanning Free Space Measurement System," Measurement Science and Technology, Vol. 29, No. 7, 2018.
  7. Bartley, P.G., and Begley, S.B., "Improved Free-Space S-Parameter Calibration," Proceeding of Instrumentation and Measurement Technology Conf., 2005, pp. 372-375.
  8. Ahmed, H., Hyun, J.M, Lee, J.R., and Lee, W.J., "Development of Scanning Free-Space Measurement Setup and Its Application to Structural Imaging," Proceeding of the Asia Pacific Conference of the Prognostics and Health Management Society 2017, Jeju, Korea, July, 2017.
  9. MMS (2011), "Free Space Measurement Systems", Accessed Jan 10, 2018, http://www.mmstech.com/free-space-systems.aspx.

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