LADP-2 Experimental System of Pulsed NMR

Short Description:

Pulsed Fourier transform nuclear magnetic resonance uses pulsed RF field to act on the nuclear system to observe the response of the nuclear system to the pulse, and uses fast Fourier transform (FFT) technology to transform the time domain signal into frequency domain signal, which is equivalent to multiple single frequency continuous wave nuclear magnetic resonance spectrometers are excited at the same time, so the nuclear magnetic resonance phenomenon can be observed in a large range, and the signal is stable At present, pulse method is used in most NMR spectrometers, while pulse method is used in MRI.

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Experiments

1. Understand the basic physical theory and experimental configuration of a PNMR system. Learn to explain related physical phenomena in PNMR using classical vector model.

2. Learn to use signals of spin echo (SE) and free induction decay (FID) to measure T₂ (spin-spin relaxation time). Analyze the influence of magnetic field homogeneity on NMR signal.

3. Learn to measure T₁ (spin-lattice relaxation time) using reverse recovery.

4. Qualitatively understand the relaxation mechanism, observe the effect of paramagnetic ions on nuclear relaxation time.

5. Measure T₂ of copper sulfate solution at different concentrations. Determine the relationship of T₂ with the change of concentration.

6. Measure the relative chemical displacement of the sample.

Specifications

Description	Specifications
Power supply of modulation field	maximum current 0.5 A, voltage regulation 0 – 6.00 V
Power supply of homogenous field	maximum current 0.5 A, voltage regulation 0 – 6.00 V
Oscillator frequency	20 MHz
Magnetic field strength	0.470 T
Magnetic pole diameter	100 mm
Magnetic pole distance	20 mm
Magnetic field homogeneity	20 ppm (10 mm × 10 mm × 10 mm)
Controlled temperature	36.500 °C
Magnetic field stability	4 hours warm to be stabilized, Larmor frequency drift less than 5 Hz per minute.

Parts List

Description	Qty	Note
Constant Temperature Unit	1	including magnet and temperature control device
RF Transmitting Unit	1	including power supply of modulation field
Signal Receiving Unit	1	including power supply of homogenous field and temperature display
Power Cord	1
Various Cable	12
Sample Tubes	10
Instructional Manual	1