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Microwave Nondestructive Testing of Composite Materials using Free-Space Microwave Measurement Techniques

From Emerson & Cuming Microwave Products, Inc.
 

 

Microwave Nondestructive Testing (MNDT) techniques have advantages over other NDT methods (such as radiography, ultrasonics, and eddy current) regarding low cost, good penetration in nonmetallic materials, good resolution and contactless feature of the microwave sensor (antenna). For MNDT techniques, the measured parameters are reflection coefficients, transmission coefficients, dielectric constants, loss factors, and complex permeabilities as a function of microwave frequency and temperature. These measured parameters can be related to material parameters of interest (e.g., flaws, binder content, moisture content, etc.) by suitable modeling and calibration. We have employed a free-space microwave measurement (FSMM) system which can measure electromagnetic properties (complex permittivity, complex permeability, reflection coefficients, etc.) for evaluation of composite materials.

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