The accuracy of measuring the coefficients of transmission and reflection of materials in the presence of random errors in the formation of fields

Background. One of the characteristic features of the current stage in the development of military equipment is the widespread use of special structural materials and coatings with specified properties of interaction with electromagnetic fields, which are subject to measurement during production and operation. Most often, measurements are carried out in quasi-flat radiation and reception fields. At the same time, the regularities of the influence of random errors in the formation of flat fields on the accuracy of measuring the characteristics of special structural materials and coatings have not been studied enough. Aim. The purpose of this work is to establish quantitative patterns of the influence of random phase errors in the formation of flat fields on the errors in measuring the transmission and reflection coefficients of materials and coatings. Methods. Studies of the influence of random phase errors in the formation of flat fields of irradiation and signal reception on the accuracy of measuring the transmission and reflection coefficients of objects were carried out using the methods of mathematical modeling and statistical radio engineering. Results. Calculation relations are obtained for estimating the magnitude of errors in measuring the transmission and reflection coefficients. Conclusion. With small errors and a small interval of spatial correlation, the errors of the measured average values of the transmission and reflection coefficients are proportional to the errors in the formation of the irradiation and reception fields and the relative value of the spatial correlation interval must exceed 22 degrees.