Microwave nondestructive testing

Zoughi. R.. and Ganchev. S. I. (1994), Application of microwave nondestructive testing and evaluation to thick composites. Proc. of the Conf on NDE Applied to Proce.ss Control of Composite Fabrication. Oct. 1994. pp. 77-89. 

The importance of microwave nondestructive testing for coatings becomes more obvious when consulting the data in Table 1.10, which elucidate the potential of this method. 

Table 1.10 Microwave nondestructive testing ofdielectric polymeric coatings in noncontact fashion. Access to only one side ofthe material is needed [107],...

Diener. L. (1995), Microwave near-field imaging with open-ended waveguide Comparison with other techniques of nondestructive testing. Research in NDR. 7. 2 3. 1.37-152. 

Apart from the role that sub-THz radiations play in polymer chemistry, they are also very usefully applied in polymer physics. As an example, this might involve dielectric spectroscopy, which is used widely to characterize the molecular dynamics of polymers. Moreover, microwaves are employed for the nondestructive testing of polymer materials, an example being the detection of heterogeneities in plastic articles. 

Compared to traditional nondestructive testing methods, microwave-based inspection yields a better contrast than X-ray absorption techniques, and a better signal-to-noise ratio than ultrasound inspection. The primary advantages of microwave testing are that measurements can be performed contact-free, and with single-sided access to the sample. 

Hinken, J.H. and Beilken, D. (2005) Microwave defectoscopy with extended eddy current system. Online J. Nondestruct. Test., NDT.net 10, October. Available at http //www.ndt. net/vl 0n09. htm. 

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