FREQUENCY LOCATION APPARATUS, METHODS, AND SYSTEMS

摘要

In some embodiments, an ex-situ apparatus and a system, as well as a method and an article, operate to transmit wideband modulated pulses to generate an externally-projected oscillating magnetic field in a material body, to record one or more raw echo free induction decay (REFID) signals during echo acquisition periods following some of the second modulated pulses, and to transform the acquired REFID signals via frequency decomposition to determine a preferred nuclear magnetic resonance frequency associated with a maximum amplitude of decomposed frequency components. Additional apparatus, systems, and methods are described.

主权项

1. An ex-situ nuclear magnetic resonance (NMR) apparatus, comprising:
at least one electromagnetic transmitter and receiver pair; and a first processor to record at least one raw echo free induction decay (REFID) signal provided by the receiver during an echo acquisition period that follows each of a series of second modulated pulses forming part of a pulse train transmitted by the transmitter, the pulse train comprising a first modulated pulse followed by the series of the second modulated pulses, the pulse train to generate an externally-projected oscillating magnetic field in a material body, wherein both the first and the second modulated pulses have a bandwidth greater than three percent of their center transmit frequency, and wherein the first processor is to transform the at least one of the REFID signals via frequency decomposition into decomposed frequency components to determine a preferred NMR frequency for the at least one electromagnetic transmitter and receiver pair associated with one of the decomposed frequency components having a maximum amplitude.