Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

Microwave NDE Test Fixture Examples

Craig E. Nelson – Consultant Engineer

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

When I got interested in microwave non-destructive and more-or-less non-contacting testing of porous silicon, I began to make up a variety of suitable test fixtures.

These devices were assembled from bits and pieces of microwave hardware that were obtained piecemeal over time. Despite the home-brew nature of these devices, they worked fairly well.

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

X Band (8-12 GHz) Test Fixture for Planar DUT Samples

Waveguide Transition

Slide Screw Tuner

3 Port Circulator Tuned Diode

Detector

Aperture Table for Test Sample

“E” Bend

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

X Band (8-12 GHz) Test Fixture for Planar DUT Samples

Waveguide Transition

Aperture Table for Test Sample

10 dB Bidirectional

Coupler“H” Bend

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

Demountable 1 GHz Cavity Resonator with Sub-Wavelength Sensing Aperture

Cylindrical Cavity Wall

Sensing Aperture

Small Cavity

Excitation loop

Cavity Base

Assembly Cavity Top Plate

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

Collection of Broadband, Small Aperture Coaxial “Hard-line” Microwave Sensors

Milled Aperture

Milled Aperture

Aperture Table

Nelson Research, Inc. 2142 – N. 88th St. Seattle, WA. 98103 USA 206-498-9447 Craigmail @ aol.com

Summary and Conclusions

An interesting variety of practical microwave NDE Microwave Test Fixtures have been presented