Microwave near-field imaging with open-ended waveguide—Comparison with other techniques of nondestructive testing

Abstract

Abstract The results of an experimental study of microwave imaging with an open-ended waveguide at 30 GHz for NDE of dielectric materials are presented. Using a hybrid measurement method, the near-field point spread function is investigated. Improvement of sensitivity and resolution via deconvolution also is discussed. A comparison of results obtained with more prominent NDE methods as ultrasonics, X-rays, and thermal waves demonstrates the performance of the technique.