D.C. resisitivity and georadar methods applied to flood embankments investigations

Research with electromagnetic geophysical methods allows detection of inhomogeneities in near-surface structure of the ground. These methods allow non-inject and linear measurements structure of researched object and fast localizing dissimilarity in his structure. Research of flood embankments was carried by these methods. Flood embankments were chosen as one of most important elements of hydro - protection systems. The paper presents results of examination of flood embankments by means of two geophysical methods: GPR and D.C. resistivity

Microwave Differential Frequency Splitting Sensor Using Magnetic-LC Resonators

A differential microwave permittivity sensor and comparator is designed using a microstrip transmission line loaded with a magnetic-LC resonator. The microstrip transmission line is aligned with the electric wall of the resonator. The sensor shows a single transmission zero, when it is unloaded or loaded symmetrically on both halves. A second notch appears in the transmission response by asymmetrical dielectric loading on the two halves of the device. The frequency splitting is used to characterize the dielectric properties of the samples under test. The sensitivity of the sensor is enhanced by removing the mutual coupling between the two halves of the magnetic-LC resonator using a metallic wall. The sensors’ operation principle is explained through a circuit model analysis. A prototype of the designed sensor is fabricated and measurements are used for validation of the sensing concept. The sensor can be used for determination of the dielectric properties in solid materials or detecting defects and impurities in solid materials through a comparative measurement with a reference sample