Model of transmission of probing signals in the study of nano-objects

Diagnosis of multilayer structures and composite parts by multifrequency phase detection

“…A multi-frequency phase detection method based on damage reflections is a convenient tool for analyzing the condition of such a line. In modern research, the possibility of unambiguity in the interpretation of the information obtained by this method has been repeatedly pointed out [1][2][3]. In [1,2] it was shown that despite the fact that the reflection signals in the phase method at each frequency are the vector sum of harmonic signals at the sounding frequency, but the vector of the sum of these signals will vary depending on the signal frequency.…”

“…As a result of application of results of a small number of measurements, by calculations, values of necessary parameters come. This approach was used in the method of measuring the distance of two objects [1][2][3].…”

“…When moving to the three-dimensional problem of probing the structure, it is necessary to use one radiating antenna to emit the probing signal А1 and three antennas А2,, АЗ, А4 to receive the reflected signals, and they must be located on more than one line. It is proposed to place the emitter and two receivers on one line, and the third receiver on a line perpendicular to the line connecting the first two receivers, and passes through the point of installation of the emitter [10,11]. All distances between the emitter and receivers are the same and equal to 2R (Fig.3).…”

“…Especially hard to find faults in hidden wires. Time domain reflectometry (TDR), another traditional method for locating faults, was fond to be enough accurate but difficult to use [1,2,3]. High voltage test systems are able to locate even small faults, however they are very large and expensive.…”

“…High voltage test systems are able to locate even small faults, however they are very large and expensive. Also, high voltage testing methods are able to reduce lifetime of wires or even create new faults [1,2,3]. That's why new methods are needed, and development funds have led to the emergence of a number of different techniques.…”