<title>Phase-shifting microwave interferometry for nondestructive testing</title>

Abstract

Our work describes a method for wave-front shape evaluation in microwave range. The evaluation is carried out by measurement and analysis of the interference field that originates from interference of the reference microwave field with the investigated (object) wave field. The phase of investigated microwave field is then determined from values of squared amplitude of the electric field intensity using the phase-shifting technique. The advantage of the proposed method is the fact that the method is based only on scalar measurements of microwave field. The proposed evaluation method is an analogy to phase-shifting interferometry in optical testing, but it uses microwaves instead of optical wavelengths. Due to physical properties of microwaves, the method can be used for various applications in nondestructive testing.