亥姆霍兹线圈９/strong>
- 允许**测量磁核MOMEMENTS皃/li>
- 提供31P＋sup>2小时原子核的实验?/li>
- 定量SHOW磁场添加作为载体
Introduction
Gradient Coils:
- Homogenize Local Earth's Magnetic Field
- Permit Measurement of Spin-Spin Relaxation (T2)
- Demonstrate One-Dimensional NMR Imaging (MRI)
- Generate Observable (and Audible) Spin-Echoes
Helmholtz Coils:
- Permit Absolute Measurement of Nuclear Magnetic Moments
- Provide Fields for Experiments on31P and2H Nuclei
- Show Quantitatively that Magnetic Fields Add as Vectors
The Earth’s Field Gradient/Field Coil System (EFGFC1-A) is a valuable addition to theEarth’s Field Nuclear Magnetic Resonance (EFNMR1-A) apparatus.Although the EFNMR1-A offers a long list of experiments that can be performed in liquids that contain either hydrogen or fluorine these Gradient/Field Coils with their controller make possible even more experiments with more nuclei. And of course the Gradient Coils can be used to make the local earth's magnetic field in the teaching laboratory significantly more homogenous over the sample. This in turn allows the nuclei in all parts of the sample to precess at the same rate producing a free-induction decay (FID) limited by the intrinsic sin-spin interaction T2 rather than by the magnetic field inhomogeneity. As a result locations in which signals were once too small to use now become viable experimental locations.The Gradient/Field Coil System was initially developed by Professor David Van Baak of Calvin College to be used with his TeachSpin EFNMR1-A. Once we saw it in action we knew we had to make it universally available. Collaborating with Dr. Van Baak we have created a robust apparatus that can be used on many levels. Dr. Van Baak has written the detailed instruction manual for both the instructor and the students. We believe that the Earth's Field NMR with this coil system is without doubt the best instrument for students beginning their study of magnetic resonance. It has no equal!
GRADIENT COILS:
- HOMOGENIZE LOCAL EARTH'S MAGNETIC FIELD
- PERMIT MEASUREMENT OF SPIN-SPIN RELAXATION (T2)
- DEMONSTRATE ONE-DIMENSIONAL NMR IMAGING (MRI)
- GENERATE OBSERVABLE (AND AUDIBLE) SPIN-ECHOES
HELMHOLTZ COILS:
- PERMIT ABSOLUTE MEASUREMENTS OF NUCLEAR MAGNETIC MOMEMENTS
- PROVIDE FIELDS FOR EXPERIMENTS ON31P2H NUCLEI
- SHOW QUANTITATIVELY THAT MAGNETIC FIELDS ADD AS VECTORS
