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Validation experiment of a numerically processed millimeter-wave interferometer in a laboratory.

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Summary

We developed a novel interferometer system for density profile measurements using a leaky-wave antenna. Laboratory tests confirmed its ability to image objects and measure thickness, though beam spot size impacts image sharpness.

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Area of Science:

  • Physics
  • Optical Engineering
  • Plasma Diagnostics

Background:

  • Accurate density profile measurements are crucial for understanding plasma behavior in various applications.
  • Traditional interferometry methods can be complex and may not provide sufficient spatial resolution.
  • Developing advanced diagnostic tools is essential for progress in plasma physics and fusion energy research.

Purpose of the Study:

  • To introduce a new interferometer system for precise density profile measurements.
  • To demonstrate the system's capability in generating multiple measurement chords using a leaky-wave antenna.
  • To evaluate the system's performance in laboratory settings.

Main Methods:

  • A novel interferometer system utilizing a leaky-wave antenna driven by multiple frequency inputs was designed.
  • Laboratory experiments were conducted to validate the system's imaging and measurement capabilities.
  • Quasi-optical mirrors were employed to generate multiple measurement chords for spatial profiling.

Main Results:

  • The interferometer successfully generated a clear image of a Teflon plate.
  • The system accurately determined the phase shift corresponding to the Teflon plate's thickness.
  • Multiple measurement chords were achieved using quasi-optical mirrors, but image sharpness was limited by the finite probe beam spot size.

Conclusions:

  • The proposed interferometer system offers a promising approach for density profile measurements.
  • The system demonstrates potential for non-invasive diagnostics in plasma environments.
  • Further optimization is needed to address image degradation due to beam spot size for enhanced resolution.