Patent ID: 9228431
Filing Date: 2016-01-05
CPC Classification: E21B,G01N,G01V

Claim Text:
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.