Loading...

Improving the Quality of Standoff Millimeter-Wave Imaging by Using Polarimetry

Shojaeian, Zahra | 2020

408 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52598 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ahmadi Boroujeni, Mehdi
  7. Abstract:
  8. In recent years, the growing importance of imaging in the fields of medicine, security, food quality control, etc. has led to many investigations to find the most efficient imaging methods. In this thesis, the improvement of high frame-rate millimeter-wave stand-off imaging is investigated using the polarimetry method. The main objective of this study was to use Cx-pol scattered waves from rough surfaces, especially the edges of a Perfect Electric Conductor (PEC), to detect the edges of this object from the human body surface. Since the surface of the human body at the desired operating frequency (100 GHz) is almost flat, the background effect can be eliminated by analyzing the Cx-pol reflections. As a result, the reflections from the edges of the object can reveal its shape in the presence of the background. In this thesis, the idea of Cx-pol waves scattered from the edges of the PEC object is investigated using the antenna radiation integrals and the Physical Optics (PO) relations. Then, by comparing radiations with different source polarizations and their effects on illuminating different edges of the object, a method is proposed to obtain maximum Cx-pol reflectance from the edges of the object. Then, using simulation, the validity of the idea is evaluated. The performance and efficiency of the idea in question have been evaluated by presenting the results of practical tests using a 100 GHz stand-off imaging system. The results of using the polarimetric technique in these imaging tests have been measured by implementing an edge detection algorithm that demonstrates the good performance of this technique in stand-off imaging
  9. Keywords:
  10. Millimeter Wave ; Physical Optics ; Terahertz Imaging ; Cross-Polarized Scattering ; Stand-Off Imaging ; Polarimetry

 Digital Object List

 Bookmark

No TOC