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Nondestructive imaging is a method of examining a material without direct contact that additionally does not alter the properties of the material. The terahertz imaging system currently in development uses the principle of interferometry (a Michelson Interferometer) such that frequency modulated terahertz signals are split and directed to the object under study and a reference mirror; then the detector will acquire the intensity of the combined reflected signals that contains information about the objects in the path of the beam.
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Mirando , D. A., Higgins , M. D., Sokhey , S., Larson , M., & Petkie , D. T. (2016). Nondestructive Evaluation & Radar Imaging using Terahertz Signals. .
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