Study on signal intensity of low field nuclear magnetic resonance via an indirect coupling measurement

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	Study on signal intensity of low field nuclear magnetic resonance via an indirect coupling measurement
	Jiang, FY ; Wang, N ; Jin, YR ; Deng, H ; Tian, Y ; Lang, PL ; Li, J ; Chen, YF ; Zheng, DN
刊名	CHINESE PHYSICS B
	2013
卷号	22 期号:4
关键词	indirect coupling measurement superconducting quantum interference devices low field nuclear magnetic resonance
ISSN号	1674-1056
通讯作者	Zheng, DN (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	We carry out an ultra-low-field nuclear magnetic resonance (NMR) experiment based on high-T-c superconducting quantum interference devices (SQUIDs). The measurement field is in a micro-tesla range (similar to 10 mu T-100 mu T) and the experiment is conducted in a home-made magnetically-shielded-room (MSR). The measurements are performed by the indirect coupling method in which the signal of nuclei precession is indirectly coupled to the SQUID through a tuned copper coil transformer. In such an arrangement, the interferences of applied measurement and polarization field to the SQUID sensor are avoided and the performance of the SQUID is not destroyed. In order to compare the detection sensitivity obtained by using the SQUID with that achieved using a conventional low-noise-amplifier, we perform the measurements using a commercial room temperature amplifier. The results show that in a wide frequency range (similar to 1 kHz-10 kHz) the measurements with the SQUID sensor exhibit a higher signal-to-noise ratio. Further, we discuss the dependence of NMR peak magnitude on measurement frequency. We attribute the reduction of the peak magnitude at high frequency to the increased field inhomogeneity as the measurement field increases. This is verified by compensating the field gradient using three sets of gradient coils.
资助信息	State Key Development Program for Basic Research of China [2011CBA00106, 2009CB929102]; National Natural Science Foundation of China [11104333, 11161130519, 10974243]
语种	英语
公开日期	2014-01-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57502]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Jiang, FY,Wang, N,Jin, YR,et al. Study on signal intensity of low field nuclear magnetic resonance via an indirect coupling measurement[J]. CHINESE PHYSICS B,2013,22(4).
APA	Jiang, FY.,Wang, N.,Jin, YR.,Deng, H.,Tian, Y.,...&Zheng, DN.(2013).Study on signal intensity of low field nuclear magnetic resonance via an indirect coupling measurement.CHINESE PHYSICS B,22(4).
MLA	Jiang, FY,et al."Study on signal intensity of low field nuclear magnetic resonance via an indirect coupling measurement".CHINESE PHYSICS B 22.4(2013).