Abstract
In this work a systematic identification of factors contributing to signal ringing in unilateral nuclear magnetic resonance (NMR) sensors is conducted. Resonant peaks that originate due to multiple factors such as NMR, electrical, magneto-acoustic, core material response, eddy currents and other factors were observed. The peaks caused by the measurement system or electrical resonances and induced magnet vibrations are further analyzed. They appear in every measurement and are considered as interference to signals received from the magnetic core. Forming a distinction between different peaks is essential in identifying the primary contribution to the captured resonant signal. The measurements for the magnetic core indicate that the magnetization induced resonant peaks of the core have relatively higher amplitudes and shorter decay times at low frequencies.
Highlights
Unilateral nuclear magnetic resonance (NMR) techniques, based on open-ended magnets find wide applications in areas that are inaccessible using conventional magnet geometries.[1]
In order to determine the origin of multiple resonant peaks, pulsed resonance measurements were conducted over a frequency range of 0.1 to 1.4 MHz and resonant frequencies were identified by application of narrowband (20 μs) and broadband (200μs) pulses at each particular resonant peak
The pulse duration and repetition rate were set to 200μs and 500ms respectively. Since these correspond to low frequencies, it is understood that they do not appear as resonant peaks in the measurement
Summary
Unilateral nuclear magnetic resonance (NMR) techniques, based on open-ended magnets find wide applications in areas that are inaccessible using conventional magnet geometries.[1]. Commonly employed by unilateral NMR measurement systems, consists of repeated application of an excitation pulse and detection of induced signals in a pick-up coil. It is a known method for studying magnetization induced resonant peaks.[10] In this work, a pulsed resonance method is used for systematic analysis and identification of factors contributing to signal ringing in unilateral NMR sensors. The findings of this study reveal resonances from three predominant sources namely: electrical, vibrational and material Overall, these findings would be highly beneficial in estimating the origin of resonances, improvements in system sensitivity and rapid data acquisition
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