<title>Two-frequency oscillator for interferometers with polarization dived channels</title>

Synthesis of Two-Frequency Symmetrical Radiation and Its Application in Fiber Optical Structures Monitoring

“…9. We are the first, who shown (Il'in et al, 1996(Il'in et al, , 1997, that when converter operated in zero point of modulation characteristic described above Il'in-Morozov method was realized ( fig. 9, c) and output spectrum was described as …”

Fiber-optic system for checking the acoustical parameters of gas-turbine engine flow-through passages

“…Distributions of pressure and velocity throughout the cantilever obtained at conditions of channel flow action are calculated by using the finite-element method; the background noises are in this case ignored; as a result, it made it possible to determine the non-uniformities of the noise structure of reactive gas flow at the nozzle section more exactly [10][11][12][13][14] . At the same time, it is possible to determine the presence of typical or uncertain defects by using as the base the deviations of frequency levels of acoustic pressure from the reference ones.…”

Theory of symmetrical two-frequency signals and key aspects of its application

“…We consider the set of the analysis and synthesis problems which should be solved by development of the theory and technical equipment of optical reflectometers for fiber optical structures (FOS) monitoring in optical two frequency domain (OTFDR) [3][4][5][7][8] . Based upon this technique, the synthesis of two frequency symmetrical probing radiation (TFSPR), various photonic sensing of fiber optic structures and optical information-processing applications have been developed [9][10][11][12][13][14][15] .…”