0.5T desktop nuclear magnetic resonance relaxation measurement system

The resonance phenomenon of the 0.5T desktop nuclear magnetic resonance relaxation measurement system occurs through energy transfer between atomic nuclei and between atomic nuclei and the surrounding medium. And relaxation time is an important parameter for describing this energy transfer process. Due to the correlation between relaxation phenomena and molecular motion, measuring relaxation time can be used to study the motion state and activation energy of molecules, thereby enabling the study of their structure.

　　0.5T desktop nuclear magnetic resonance relaxation measurement systemThe application of nuclear magnetic resonance imaging is becoming increasingly widespread, so many physics majors in colleges and some majors in medical schools have started to set up such teaching experiments. Therefore, our company has designed low-cost and high-performance nuclear magnetic resonance imaging teaching instruments. It is suitable for undergraduate teaching in physics, biology, and imaging majors.

　　0.5T desktop nuclear magnetic resonance relaxation measurement systemInstrument features:

1. Using high magnetic energy product magnetic steel, resulting in a small volume;

2. The magnet adopts sub micron precision machining technology, so the magnetic field uniformity is high;

3. The magnet adopts a high-precision constant temperature controller, so it has high stability;

4. Due to the use of DDS technology in RF circuits, the operating frequency can be adjusted over a wide range (10-20MHz) with high resolution (1Hz) while ensuring high stability;

5. The use of orthogonal detection technology can accurately measure RF phase, which is beneficial for physics theorists to understand the mechanism of quantum mechanical energy level transitions (nuclear magnetic resonance density of states theory);

6. This instrument can hold samples of 10mm size, so it is mainly used for teaching and can also be used for some small-scale scientific research work. Such as leaves, smaller seeds, tissue slices of small animals, etc. It can be used as an analytical testing instrument for measuring relaxation time, such as measuring seed oil content, water content, etc.

The main functions of the desktop nuclear magnetic resonance relaxation measurement system are:

1. Programmable pulse sequence generator;

2. One-dimensional magnetic resonance imaging;

3. Two dimensional magnetic resonance imaging (including frequency space encoding and phase space encoding);

*4. Three dimensional magnetic resonance imaging experiment;

5. T1 weighted map, T2 weighted map, density map;

6. Programmable pulse sequence generator (including CPMG pulse measurement T2), suitable for EPR, SE, 3DGE sequences;

7. Spin echo measurement T2;

8. Reverse recovery method for measuring T1;

9. Gradient echo test;

*10. Adding a 5mm RF coil probe can measure chemical displacement (uniformity of 1ppm);

*11. Nuclear magnetic resonance relaxation time measuring instrument.

Technical performance:

1. Magnetic field strength: 0.44-0.46T;

2. Resonance frequency: between 18-20MHz;

3. Magnetic pole diameter: 10cm;

*4. Uniformity: 0.8ppm (5mm space);

5ppm (10mm space);

5. Sample size:<Φ 10mm;

6. Graphic resolution: Normal mode 128 × 128 High resolution mode 256 × 256 (interpolation can reach up to 512 × 512);

*7. Temperature control stability: The temperature control accuracy of the chamber is ± 0.005 ℃; Display accuracy of 1m ℃.