Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Measurement of Small Linear Displacements based on the Characteristics of a Standing Wave G.N. AKHOBADZE Based on the characteristics of a standing wave, the principles of constructing meters for measuring small linear displacements of various objects are presented. The features of a standing electromagnetic wave that occurs during the interference of waves falling on the surface of the controlled medium and refl ected from its surface are analyzed. The use of two diode sections and an autotuning method is justifi ed for constructing displacement meters. Schematic solutions of non-contact measurements of small linear displacements are given, taking into account the modern element base of ultra-high-frequency technology of the centimeter and millimeter wave ranges. Keywords: electromagnetic wave, standing wave amplitude, measuring waveguide, wavelength, oscillation frequency, distance, quarter wavelength. DOI: 10.25791/pribor.10.2025.1619 Pp. 08-13.