MW/MNDT/µTMicrowave testing is the NDT of components using microwaves. Microwaves are electromagnetic waves that lie between radio waves and visible light on the electromagnetic spectrum. In NDT terms, MW lies between electromagnetic techniques, such as eddy current testing, and thermographic techniques that use infrared.

Advantages include the lack of a need for contact between the sensor and the object being inspected, the ability to penetrate dielectric materials and superior sensitivity to certain material constituents and flaws.

Recent advances in modelling and measurement techniques have expanded the range of applications for microwave NDT. Such applications include inspecting modern materials such as composites, detecting and characterising surface flaws and evaluating the compressive strength of cement structures.

For more information on MW, see:


J T Case and S Kenderian, ‘MW NDT: An inspection method’, Materials Evaluation, Vol 75, No 3, pp 339-346, March 2017.

Hong Zhang, Luxiong Xu, Ruikun Wu and A Simm, ‘Sweep frequency microwave NDT for subsurface defect detection in GFRP’, Insight – Non-Destructive Testing and Condition Monitoring, Vol 60, No 3, 
pp 123-129, March 2018.

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