Peculiarities of using s-simulation for parametric identification of multiplet 115 In NQR spectra in InSe

Samila, Andriy

doi:10.1016/j.measurement.2017.04.035

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…To implement the configuration structure of a digital receiver based on an FPGA, its simulation model was developed. In the MATLAB Simulink software, the simulation and calculation of the parameters of its main modules, in particular the characteristics and coefficients of the digital filters, were carried out [ 28 ]. The theoretical basis of the simulation model is based on the SDR method, the essence of which is the use of full digitization of the FID signal by high-speed ADCs with subsequent processing of the received data by a digital signal processor [ 29 ].…”

Section: Methods Of Configuring Devices Based On the Syntax Of Modeling Dynamic Modes Of Logical Structuresmentioning

confidence: 99%

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Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

Samila

Hotra

Majewski

2021

Sensors

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This paper presents a method for implementing the configuration structure of an integrated computational core of a pulsed nuclear quadrupole resonance (NQR) sensor based on a field-programmable gate array (FPGA), which comprises the following modules: a three-channel direct digital synthesizer (DDS), a pulse sequence shaper and a software-defined radio. Experimental studies carried out using the in-circuit analyzer SignalTap Logic Analyzer have confirmed the reliability of the correct and stable operation of the functional modules of the configuration structure at all stages of signal transformations, starting from the formation of the envelope of the excitation pulses and ending with the obtainment of low-frequency quadrature signals at the outlet of the compensating filters. The time and frequency dependences of the amplitude of the output signals generated using the DDS based on a 48 bit phase accumulator are investigated. This development can be used when creating pulsed coherent NQR sensors in the frequency range of 1 MHz–50 MHz.

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Section: Methods Of Configuring Devices Based On the Syntax Of Modeling Dynamic Modes Of Logical Structuresmentioning

confidence: 99%

“…The data coefficients of FIR filters are calculated in MATLAB FDATool. Earlier, we described the processes of simulation modeling and the synthesis of SDR filters in MATLAB Simulink in more detail [ 28 , 29 ].…”

Section: Methods Of Configuring Devices Based On the Syntax Of Modeling Dynamic Modes Of Logical Structuresmentioning

confidence: 99%

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

Samila

Hotra

Majewski

2021

Sensors

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“…It is known that in the pulsed NQR, the FID signals are detected by transferring the resonance spectrum of width  to the low frequency (LF) range by subtracting the reference frequency ω 0 , which is close to the frequency of the resonating nucleus. The method for detecting FID signals which is partially considered in [5] requires a more thorough analysis, since its implementation governs the accuracy of visualization of complex resonance spectra, especially when it comes to multi-pulse experiments. The features of the Fourier transform create additional problems when selecting the reference frequency for the synchronous detector ω 0 .…”

Section: Statement Of the Research Taskmentioning

confidence: 99%

Synthesis of the configuration structure of digital receiver of NQR radiospectrometer

Hotra¹

2018

ELECTROTECHNICAL REVIEW

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Analysis of methods for demodulation of free induction decay signal that are suitable for use in pulsed nuclear quadruple resonance radiospectrometers was performed. The structure and MATLAB Simulink model of the receive path of radiospectrometer was synthesized, in which the Software Defined Radio technology was chosen for the implementation of a quadrature detector with a filtration and quadrature reflection suppression system. The application of the principle of direct digitization of the signal made it possible to significantly reduce the length of the analog portion of the receiver, and, consequently, reduce the noise of the useful signal and the level of out-of-band higher order spectral components. Streszczenie. Przeprowadzono analizę metod demodulacji sygnału zaniku indukcji swobodnej, które są odpowiednie do stosowania w impulsowych radiospektrometrach jądrowego rezonansu kwadrupolowego. Opracowano strukturę i model ścieżki odbiorczej radiospektromeru w środowisku MATLAB Simulink, w którym do realizacji kwadraturowego detektora z układem filtracji i tłumienia odbicia kwadraturowego wybrano oprogramowanie Software Defined Radio. Zastosowanie zasady bezpośredniej cyfryzacji sygnału pozwoliło znacznie zmniejszyć długość analogowej części odbiornika, a w konsekwencji zmniejszyć szum sygnału użytecznego oraz poziom pozapasmowych składowych widmowych wyższych rzędów. (Synteza struktury konfiguracji odbiornika cyfrowego radiospektromeru NQR).

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“…The presence of such defects leads to a multiplicity of NQR spectra with bandwidths of about several hundred kilohertz. In this case, the NQR excitation requires the use of short (a few microsecond) pulses [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

Hotra

Samila

2020

Electronics

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A low-cost digital pulsed nuclear quadrupole resonance (NQR) radio-spectrometer is proposed, all main modules of digital processing and synthesis of which on the field-programmable gate array (FPGA) are implemented. The input sensitivity of the device is of the order of 3 μV to 5 μV which allows conducting NQR studies in samples of relatively small dimensions. The application of the developed methods of NQR pulsed radio spectroscopy made it possible to increase spectral resolution, improve spectral shape and significantly reduce the time of research. In the case of studying InSe and GaSe crystals, spectra with signal-to-noise ratio (SNR) values of 41.9 dB were observed in samples with a volume of 0.1 cm3. As the results of the research have shown, the characteristics of the proposed spectrometer make it effective when used to observe free induction decay (FID) signals of a significant number of isotopes of elements with quadrupolar nuclei.

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Peculiarities of using s-simulation for parametric identification of multiplet 115 In NQR spectra in InSe

Cited by 6 publications

References 15 publications

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

Synthesis of the configuration structure of digital receiver of NQR radiospectrometer

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

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