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    • 4. 发明授权
    • Accelerating NMR sample thermal equilibration by RF heating
    • 通过RF加热加速NMR样品热平衡
    • US06218835B1
    • 2001-04-17
    • US09365190
    • 1999-08-02
    • Stephen H. Smallcombe
    • Stephen H. Smallcombe
    • G01V300
    • G01R33/31
    • Radio-frequency (RF) heating is used to accelerate the thermal equilibration of dielectrically lossy nuclear magnetic resonance (NMR) samples. High-power heating RF pulses are applied to the sample before lower-power measurement RF pulses, using any of the NMR probe coils. The heating pulses are offset in frequency relative to the measurement pulses, such that the heating pulses do not magnetically affect the spins of interest. Heating pulse sequences of decreasing power can be used to prevent the sample temperature from overshooting the desired equilibrium temperature. Heating RF pulses can pre-establish the thermal effects of both measurement-independent and measurement-dependent heating. For pre-establishing the thermal effects of measurement-dependent heating, the heating pulse transients are chosen to be proportional to subsequent measurement pulse transients.
    • 射频(RF)加热用于加速介电损耗核磁共振(NMR)样品的热平衡。 使用任何NMR探针线圈,在较低功率测量RF脉冲之前,将高功率加热RF脉冲施加到样品。 加热脉冲相对于测量脉冲的频率偏移,使得加热脉冲不会磁感应地影响感兴趣的自旋。 可以使用降低功率的加热脉冲序列来防止样品温度超过所需的平衡温度。 加热RF脉冲可以预先确定测量无关和依赖于测量的加热的热效应。 为了预先确定依赖于测量的加热的热效应,选择加热脉冲瞬变与随后的测量脉冲瞬变成比例。