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核磁共振（NMR）梯度場(chǎng)線圈系統(tǒng)

梯度線圈：

• 均質(zhì)本地地球磁場(chǎng)
• 允許測(cè)量自旋-自旋弛豫（T ₂）
• 演示一維核磁共振成像（MRI）
• 生成觀察到（和聲音）自旋回波

亥姆霍茲線圈：

• 允許**測(cè)量原子核磁矩
• ³¹ P和²小時(shí)核實(shí)驗(yàn)提供字段
• 定量顯示，磁場(chǎng)作為載體

地球的場(chǎng)梯度/場(chǎng)線圈系統(tǒng)（EFGFC1Å）是一個(gè)有價(jià)值的除了 地球的現(xiàn)場(chǎng)核磁力共振（EFNMR1）設(shè)備。雖然在EFNMR1à提供一個(gè)長(zhǎng)列表的實(shí)驗(yàn)，也可以進(jìn)行液體包含無論是氫或氟，這些梯度/場(chǎng)線圈，用自己的控制器，甚至有可能使更多的實(shí)驗(yàn)，與更多的核。而且，當(dāng)然，梯度線圈可以用于本地地球磁場(chǎng)在教學(xué)實(shí)驗(yàn)室樣品在顯著更均勻。這反過來，使細(xì)胞核內(nèi)所有部位的樣品以相同的速率進(jìn)動(dòng)，產(chǎn)生一個(gè)自由感應(yīng)衰減（FID）的內(nèi)在的罪自旋相互作用ŧ _2次，而不是由磁場(chǎng)不均勻性的限制。因此，現(xiàn)在的信號(hào)的地點(diǎn)曾經(jīng)使用太小成為可行的實(shí)驗(yàn)地點(diǎn)。

漸變/場(chǎng)線圈系統(tǒng)*初是由卡爾文學(xué)院教授大衛(wèi)·Baak要與他TeachSpin EFNMR1-A。一旦我們看到它在行動(dòng)，我們知道我們不得不做出普遍。凡Baak博士合作，我們已經(jīng)創(chuàng)建了一個(gè)強(qiáng)大的設(shè)備可以用在許多層面上。凡Baak博士導(dǎo)師和學(xué)生寫了詳細(xì)的說明書。我們相信，地球磁場(chǎng)核磁共振，這個(gè)線圈系統(tǒng)，是毫無疑問，學(xué)生開始他們的研究磁共振的**工具。它有沒有平等的！

梯度線圈：

• 均質(zhì)本地地球的磁場(chǎng)
• 允許測(cè)量自旋-自旋弛豫（T ₂）
• 證明一維核磁共振成像（MRI）
• （和聲音）產(chǎn)生可觀察自旋回波

亥姆霍茲線圈：

• 允許**測(cè)量磁核MOMEMENTS的
• 提供³¹ P，²小時(shí)原子核的實(shí)驗(yàn)田
• 定量SHOW磁場(chǎng)添加作為載體

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 on ³¹P and ²H 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 ON ³¹P， ²H NUCLEI
• SHOW QUANTITATIVELY THAT MAGNETIC FIELDS ADD AS VECTORS