A5102717354- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysics and Sensor Technology
- Optical Network Technologies
- Engineering Diagnostics and Reliability
- Advanced Photonic Communication Systems
- Advanced Power Generation Technologies
- Advancements in Materials Engineering
- Metallurgy and Material Forming
- Mechanical and Thermal Properties Analysis
- Induction Heating and Inverter Technology
- Mineral Processing and Grinding
- Scientific Measurement and Uncertainty Evaluation
- Engine and Fuel Emissions
- Transport and Economic Policies
- Advancements in PLL and VCO Technologies
- Mining and Industrial Processes
- Industrial Engineering and Technologies
- Photovoltaic System Optimization Techniques
- Extraction and Separation Processes
- Advanced Measurement and Detection Methods
AGH University of Krakow
2012-2017
Institute of Industrial Organic Chemistry
2001
In this paper, we present the experimental result for fiber optic frequency transfer link with optical regenerators exploiting same Er-doped amplifying signals in both directions. The measurements performed at distance of 124 km one amplifier and 224 three amplifiers showed that presented solution is adequate transferring generated by cesium clocks, hydrogen masers, fountain clocks. Allan deviation around <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Absolute frequencies of unperturbed (12)C(16)O transitions from the near-infrared (3-0) band were measured with uncertainties five-fold lower than previously available data. The frequency axis spectra was linked to primary standard. Three different cavity enhanced absorption and dispersion spectroscopic methods various approaches data analysis used estimate potential systematic instrumental errors. Except for a well established frequency-stabilized ring-down spectroscopy, we applied...
The quality of Very Long Baseline Interferometry (VLBI) radio observations predominantly relies on precise and ultra-stable time frequency (T&F) standards, usually hydrogen masers (HM), maintained locally at each VLBI station. Here, we present an operational solution in which the are routinely carried out without use a local HM, but using remote synchronization via stabilized, long-distance fibre-optic link. T&F reference signals, traceable to international atomic timescale (TAI), delivered...
In the paper we are presenting results of experiments performed with sending frequency signals (10 MHz) to remote location exploiting optical dense wavelength division multiplexed telecommunication network. To stabilize phase signal applied approach electronic stabilization propagation delay. We measured residual instability resulting from fact that in a network forward and backward direction do not share same fiber transmitted through different pieces equipment when passing reconfigurable...
The OPTIME project creates an ultra-precise time and frequency signals dissemination system based on telecommunication networks. End users obtain access to these without incurring huge costs for the purchase of their own atomic clocks, receive service related laboratories generating international scales, which any precise must be referred. is three main elements: reference laboratories, local repositories fiber optical network with specialized transmission equipment transfers between end...
In the paper we present and briefly characterize methods of remote synchronization atomic clocks. Two groups technical solution are presented, namely employing satellites, especially GPS Common View Way Satelite Time Frequency Transfer group systems, which employs ground-base fiber optic networks. The unidirectional bidirectional time/frequency transfer schemes considered, theirs main limitations pointed out. Finally, newly established clock signals distribution network called Optime is...
The OPTIME project creates an ultra-precise time and frequency signals dissemination system based on telecommunication networks. End users obtain access to these without incurring huge costs for the purchase of their own atomic clocks, receive service related laboratories generating international scales, which any precise must be referred. This document describes final stage - developed a self-calibrating, high precision reference optical fiber links ELSTAB devices at AGH University.
In this paper we are presenting the concept of multipoint dissemination RF frequency signal via a fiber optic network with actively stabilized propagation delays. The idea allows to add tapping nodes and side branches main point-to-point transfer link, constituting tree-like network. We demonstrating experimental results 100 km-long branch starting at 110 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> km 170 link. At end obtained Allan...
The OPTIME project creates a long range dissemination system for transfer ultraprecise time scale and the references frequency signals in telecommunication networks. highest accuracy signal is available only on fiber optical networks, but other type of networks can be used to with lower adapt it needs different user groups. Article also describes experience gained during an over-a-year experiment connection between Central Office Measures (GUM) Warsaw Astrogeodynamic Observatory (AOS) Borowiec.
The article presents an identification method of the model ball-and-race coal mill motor power signal with use machine learning techniques.The stages preparing training data for parameters purposes are described, as well these aimed at verifying quality evaluated model.In order to meet tasks learning, additive regression was applied.Identification performed on basis iterative backfitting algorithm combined nonparametric estimation proposed models have predictive nature and simulation a...
The phenomenon of some special low frequency acoustic-band optical phase-noise may occur in the field depleted fibers. Because this kind noise disturb precise Time&Frequency Fiber-Optic transfer, an arrangement to do immunity tests solutions applied seems be needed. In paper first idea testbed which mechanically induced phase noise-substitute is described and its own features measured parameters are presented. harmonic signal generated by use specialized Bruel&Kjaer vibration exciter...
The main goal of OPTIME project is to design and create an infrastructure for a long range dissemination system transfer ultraprecise time scale reference frequency signals in telecommunication networks. based on three elements: laboratories, local repositories fiber optical network with specialized transmission equipment transfers between end-users. This article describes all elements particular emphasis repositories. Moreover this also experience gained during more than two years...
We report a system of two independent strontium optical lattice standards with <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">88</sup> Sr probed single shared ultra-narrow laser. achieved frequency stability (frequency between standards) 7 × 10 xmlns:xlink="http://www.w3.org/1999/xlink">-17</sup> . The absolute the clock transition can be measured by use an comb referenced to UTC(AOS) and UTC(PL) via 330-km stabilized fibre optic link OPTIME...
In the paper results of laboratory experiments are presented concerning time and frequency transfer in 480 km long electronically stabilized fiber optic link. The link comprised nine spooled spans with attenuation between 5-15 dB eight custom-built bidirectional amplifiers. Allan deviation measured for at one-day averaging was around 4·10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-17</sup> , whereas 1PPS signal range 650-900 fs times 10...