Coax Electromagnetic Sample Holders

• Designed to eliminate or minimize two major sources of measurement error:

• Sample fit (gaps between the inner and outer conductors)
• Sample Position (accurately knowing the distances to the sample faces)

• The design still defines the state-of-the-art (SOA)

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• GAPs has a next generation concept that will also easily allow coaxial discontinuity measurements to be made eliminating the need for the center conductor (simplifying sample preparation)

Dielectric/Magnetic NDT Probe

• Enhancing the existing open-ended waveguide dielectric probe to allow it to be used with magnetic materials as well

• Allows nondestructive broadband interrogation of the magnetic character of materials by measuring the response with and without an externally applied magnetic field

• The frequency response (signature) is influenced by
  1. material electromagnetic properties (e, m)
  2. structure
  3. physical defects

• Unique conformal tip allows the probe to be used with uneven/curved surfaces  

 Modified 1990's Presentation (pdf)

Stripline Resonant Cavities

• Novel dimensionally stable design hanging from a movable frame (in collaboration with mechanical engineer Ron Huer)

• Unique design for heating/cooling only the sample region with negligible effect on the cavity dimensions (i.e., geometric resonance frequency)

Parallel Plate Dielectric Sample Holder (GR1690A)

• Devised a new approach to correct for parasitics allowing more accurate measurements over a wider frequency region