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Application of Time-Variable Feedback to the Input Amplifier of Pulse Magnetic Resonance Spectrometers: Experimental Studies
(THU)
2002 (English)In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 22, no 4, p. 455-473Article in journal (Refereed) Published
Abstract [en]

Experimental research on the improvement of the sensitivity and time resolution of pulsedmagnetic resonance spectrometers is discussed. It is shown that application of a time-variable feedbackof a signal to the input of the receiver amplifier can decouple the "fixed" relationship betweenthe quality factor Q and the ringdown time of the resonance system. Experiments were performedwith low-frequency, radio-frequency and microwave pulse-type magnetic resonance receivers. Modificationsof an S/C-band electron spin echo modulation spectrometer carried out to check the “timevariablefeedback” performance is described. It is demonstrated that application of a time-variablefeedback can significantly reduce the ringdown time and improve the recovery properties of the magneticresonance receiver system. It is also demonstrated that the time-variable feedback can improvethe overall receiver sensitivity due to the fact that working bandwidth of the resonance system canbe optimized separately for the transmit and receive modes. Signal values could be increased at leastthree times and the signal-to-noise ratio about 1.5–2 times. The largest improvement is achieved withthe initially overcoupled resonator. Experimental spectra of test samples for different settings of thetime-variable feedback are shown.

Place, publisher, year, edition, pages
Austria: Springer-Verlag , 2002. Vol. 22, no 4, p. 455-473
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:miun:diva-10088DOI: 10.1007/BF03166126ISI: 000178323000001Scopus ID: 2-s2.0-0036400064OAI: oai:DiVA.org:miun-10088DiVA, id: diva2:273029
Projects
experimental; electron spin resonance; time resolution; sensitivity; signal- to- noise; resonator;Available from: 2009-10-19 Created: 2009-10-19 Last updated: 2017-12-12Bibliographically approved

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Koptioug, Andrei

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