Nonresonant multiple spin echoes.
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.
Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, CT 06877, USA. brill2@slb.com
Thilo M
TM
Brill
Seungoh
S
Ryu
Richard
R
Gaylor
Jacques
J
Jundt
Douglas D
DD
Griffin
Yi-Qiao
YQ
Song
Pabitra N
PN
Sen
Martin D
MD
Hürlimann