Nonresonant multiple spin echoes

被引：9

作者：

Brill, TM ^{[1
]}

Ryu, S ^{[1
]}

Gaylor, R ^{[1
]}

Jundt, J ^{[1
]}

Griffin, DD ^{[1
]}

Song, YQ ^{[1
]}

Sen, PN ^{[1
]}

Hürlimann, MD ^{[1
]}

机构：

[1] Schlumberger Doll Res Ctr, Ridgefield, CT 06877 USA

来源：

SCIENCE | 2002年 / 297卷 / 5580期

关键词：

D O I：

10.1126/science.1072245

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 Earths 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 Earths 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.

引用

页码：369 / 372

页数：4

共 26 条

[1]

Abragam A., 1978, PRINCIPLES NUCL MAGN

[2] QUANTAL PHASE-FACTORS ACCOMPANYING ADIABATIC CHANGES [J].