Статья 'Анализ шума приемного тракта ЯМР-релаксометра' - журнал 'Кибернетика и программирование' - NotaBene.ru
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Reference:

Noise analysis of the NMR relaxometer receiving channel

Rannev Evgenii Valer'evich

Assistant, Department of Information and Computing Systems, Volga State University of Technology

424000, Rossiya, respublika Mariy El, g. Yoshkar-Ola, pl. Lenina, 3

evgeny.rannev@gmail.com
Myasnikov Vladimir Ivanovich

PhD in Technical Science

Associate Professor, Department of Information and Computing Systems, Volga State University of Technology

424000, Rossiya, respublika Mariy El, g. Yoshkar-Ola, pl. Lenina, 3

v.mjasnikov@mail.ru

DOI:

10.7256/2306-4196.2014.6.13302

Review date:

02-11-2014


Publish date:

16-11-2014


Abstract: Traditionally, in pulsed NMR spectroscopy signals are registered by subtracting from it the reference frequency which is near to the Larmor frequency of the nucleus, followed by digitization and further processing. In modern NMR apparatus the receiving channel consists of preselector, quadrature detector, normalizing amplifier, low pass filter and analog-to-digital converter. The disadvantage of such a receiver is the length of the analog section, since each module adds additional noises. Thermal noise occurs on fluctuations of electrons in conductors having a particular temperature. Such fluctuations have spectral components that are in the same frequency band with useful signals.  This article analyzes the nature of the noise of the receiving channel of nuclear magnetic resonance relaxometer and evaluates its characteristics. Authors suggest replacement of the analog part of receiving channel with the digital quadrature detector and theoretically calculate the benefit from the exclusion of several noise sources.


Keywords: nuclear magnetic resonance, relaxometer, quadrature detector, signal, noise, digital receiver, envelope detector, noise factor, interference, receiving channel
This article written in Russian. You can find full text of article in Russian here .

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