Study of Intergeospheric Interaction in the Microseismic Range Using the Laser Interferential Station DOI: 10.22184/1993-7296.FRos.2022.16.7.540.550
The generation regularities of primary and secondary microseisms in the measuring ground location area have been determined by processing synchronous data of a two-coordinate laser strainmeter, a laser nanobarograph and a laser meter of hydrospheric pressure variations. The magnitude of atmospheric oscillations caused by the secondary microseisms propagating in the Earth’s crust has been obtained. The transfer factor of this interaction is about 0.023 Pa / nm that is three to four times greater than the same factor for the Rayleigh wave propagation in the Earth’s crust, generated by the earthquakes. The work results confirm the high efficiency of synchronous application of all measuring installations that allows us to accurately establish the origin of the registered geosphere disturbances.
Video Range System for Outer Space Survey During the Night Optoelectronic Instruments & Devices DOI: 10.22184/1993-7296.FRos.2022.16.7.512.521
The calculation result of the threshold illumination of a ground-based optoelectronic system (OES) in the visible range of 0.45–0.85 microns is provided. We have developed the method and performed the light calculation of the OES entrance pupil from the signal of a spherical space object (SO) illuminated by the Sun during the night. The dependence of the signal-to-noise ratio on the distance from the Earth to the SO is shown.
Influence of Strong Bending Birefringence in the Spun Fiber on Excess Noise Suppression in the Fiber Current Sensor DOI: 10.22184/1993-7296.FRos.2022.16.7.552.563
We have considered the influence of bending birefringence occurred in the spun fiber of a fiber-optic current sensor based on the Faraday effect, on the efficiency of excess noise suppression. It is shown that when the radius of spun fiber winding is small, the secondary waves arise in the fiber. Such waves eventually distort the radiated spectrum at the sensor output and therefore cause a decrease in the noise suppression efficiency. The proposed theoretical model of this effect is confirmed experimentally for the spun fiber winding radius of 5 mm.
Achievements and Prospects of Domestic DWDM Communication Systems DOI: 10.22184/1993-7296.FRos.2022.16.7.564.583
The history of development, achievements and current trends in improving technological solutions to increase the transmission speed, energy and economic efficiency of the domestic fiber-optic communication networks are considered.
Review of Superconducting Microstrip Single-photon Detectors DOI: 10.22184/1993-7296.FRos.2022.16.7.528.537
This paper reviews the state-of-the-art of superconducting microstrip single-photon detectors and provides their comparison with the nanostrip detectors. The article describes the actual detection models required for understanding the SMSPD operating principles. We have analyzed the manufacturing materials of ultrathin films designed for SMSPD demonstrating the prospects for the use of X-ray amorphous materials with α-Mn structure. As a result of methods study to improve the detector specifications, we have provided the following recommendations: to reduce DCR and increase SDE, CR and active area, it is necessary to use the SMSPDs based on the X-ray amorphous materials with a low diffusion coefficient, a topology with a high filling factor and the strip spreading at the turn based on a DBR structure.