Report

Nonresonant Multiple Spin Echoes

Science  19 Jul 2002:
Vol. 297, Issue 5580, pp. 369-372
DOI: 10.1126/science.1072245

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Abstract

Nonresonant manipulation of nuclear spins can probe large volumes of sample situated in inhomogeneous fields outside a magnet, a geometry suitable for mobile sensors for the inspection of roads, buildings, and geological formations. However, the interference by Earth's magnetic field causes rapid decay of the signal within a few milliseconds for protons and is detrimental to this method. Here we describe a technique to suppress the effects of Earth's field by using adiabatic rotations and sudden switching of the applied fields. We observed hundreds of spin echo signals lasting for more than 600 milliseconds and accurately measured the relaxation times of a liquid sample.

  • * To whom correspondence should be addressed. E-mail: brill2{at}slb.com

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