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Visuals for Bruker DRX-500 NMR Training Workshop Lecture II

These visuals are made from the original lecture transparencies

Bruker Parameters (TopSpin)

Bruker Commands (TopSpin)

New Capabilities of the DRX-500 Console

What We Keep and What We Replace in Console Upgrade

Digital Signal Processing

Digital Filters: Frequency Response Compared to Analog Filters

Oversampling and Digital Filtering: Receiver Block Diagram

Rectangular Time-Domain Digital Filter

Rectangular Filters: Effect on Frequency Domain

Test Spectrum: No Digital Filter

Test Spectrum: 7 Point Rectangular Filter

Test Spectrum: 15 Point Sinc Filter

Truncated Sinc (440 Points) and its Fourier Transform

"Brick Wall" Filter Response

Shaped (Selective) Pulses

What is the "excitation profile" of a pulse?

Short, High Power Pulse: Excitation Profile

Longer, Lower Power Pulse: Excitation Profile

Examples of Rectangular Pulses: "Hard" and "Soft"

Gaussian pulse as a laminar pulse

Selective Gaussian Pulse on Sucrose at Different Frequencies

Pulsed Field Gradients (PFG)

Magnetic Resonance Imaging (MRI)

How NMR Imaging Works

Gradient On vs. Gradient Off: Field Profile

Field Strength During a z-Axis Gradient

Effect of a Gradient Pulse on Sample Net Magnetization

Gradient Echo: Profile of NMR Tube

Untwisting the Sample Net Magnetization

Sucrose in D₂O: Effect of Gradients on ¹H Spectrum

Effect of 180^o Pulse on Twisted Coherence

Gradient-Enhanced Spin-Echo

Gradient Spin Echo: Profile of NMR Tube

Sucrose in D₂O: Effect of Gradients on ¹H Spectrum

Gradient Spin-Echo with Missing 180^o Pulse

Sucrose in D₂O: Gradient Spin-Echo with Selective 180^o Pulse

Lock Signal in Gradient Experiments