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| Our economically-priced magnetic
resonance system can be used to demonstrate free-induction decays, spin
echos and CPMG sequences in a lecture, or to perform experiments in advanced
lab courses. The system can be extended to also perform NQR measurements. |
| The system consists of a control box (left) and a magnet box (right).
The control box contains the pulse transmitter, receiver, and a microcontroller
for easy manual operation. It can also be operated by a personal
computer. The magnet box contains a 0.4T magnet and the resonant
receiver and transmitter coil. The coil can be tuned by a variable
capacitor, allowing for measuring hydrogen and fluorine samples. Conventional
5-mm NMR tubes can be used.
The receiver and transmitter frequencies can be selected separately,
allowing for an intermediate-frequency display of the MR response of the
sample. The amplitudes of the first (pi/2) and second (pi) pulse
can be varied independently. The pulse lengths and the duration between
first and second pulse can be varied between 10 microseconds and 10 milliseconds.
A trigger pulse is generated a presettable time after the first pulse.
To improve the signal-to-noise ratio, a tunable low-pass filter is
integrated. The pulse repetition time can be selected between 60ms
and 30s.
The MR signal can be displayed on a digital or an analog oscillsocope.
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| The NMR signal can be read and processed also
by a personal computer. Here is a CPMG sequence from a mineral oil sample. |
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| In addition to the intermediate frequency detector,
an envelope detector is available for easier characterization of more complex
signals (e.g., CPMG sequences). |
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| The system can be extended for NQR measurements (FID and
Spin Echo). Here is the time trace of a chlorine NQR FID. |
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