Physics Lab Equipment

LEAI-11 Experimental System of CW NMR - Advanced Model

LEAI-11 Experimental System of CW NMR - Advanced Model


  • 6 easy-to-use liquid samples in micropipette tubes

  • High homogeneous magnetic field to assure more coda waves

  • Open magnet structure for easy sample access

  • High SNR & stable frequency

  • One sample contains both H & F nuclei for determining the g-factor of F-nuclei

  • High accuracy milli-teslameter and frequency meter included


This LEAI-11 experimental system of continuous-wave nuclear magnetic resonance (CW-NMR) consists of a high homogeneity magnet and a main machine unit. A permanent magnet is used to provide a primary magnetic field to which an adjustable electromagnetic field, generated by a pair of coils, is superposed to allow a fine adjustment to the total magnetic field and to compensate magnetic field fluctuations caused by temperature variations. As only small magnetizing current is needed for relatively low electromagnetic field, the heating problem of the system is minimized. Thus, the system can be operated continuously for several hours. It is an ideal experimental instrument for advanced physics laboratories.


Using this instrument, the following experiments can be performed:


1. Observe NMR phenomenon of H- and F-nuclei.

2. Determine parameters of gyromagnetic ratio, g-factor and nuclear magnetic moment.

3. Observe the influence of magnetic field homogeneity on signal coda wave using different samples.

4. Measure magnetic field, and learn how to calibrate Teslameter through NMR method.


Types of nucleiH and F
SNR>46 dB (H nucleus)
Oscillator frequency17 MHz to 23 MHz, continuously adjustable
Area of magnet polediameter: 100 mm; spacing: 20 mm
NMR signal amplitude (peak to peak)>2 V (H-nuclei); >200 mV (F-nuclei)
Homogeneity of magnetic fieldbetter than 8 ppm
Adjustment range of electromagnetic field60 Gauss
Number of coda waves> 15

Parts List

Main Unit1
Power Cord1
BNC Cable3
Right Angle Connection Wires4
Detection Probe1
Liquid Samples in Micropipette TubesCuSO4, Fe2Cl3, HF Acid, Propanetriol, Water, MnSO4
Frequency Meter1
Instructional Manual1

LEAI-11 Experimental System of nuclear magnetic resonance.png

NMR signal observed on oscilloscope (H-nuclei)

Experimental System of CW NMR.png

Lissajous figure

Experimental System of CW NMR.png

Block diagram of controller unit

(click figure to enlarge)

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