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本文描述了在核磁共振自旋回波谱仪中应用脉冲磁场梯度测量自扩散系数。作者设计并制作了四极型磁场梯度线圈和相应的脉冲电流源,采用多功能脉冲序列发生器控制产生磁场梯度脉冲和射频场脉冲实现了测量。该方法与加恒定磁场梯度的自旋回波方法比较,具有回波信号不变窄,测量准确,灵敏度高,测量范围大,最小测量值已达到6×10~(-13)米~2/秒。
This paper describes the application of pulsed magnetic field gradient measurement of self-diffusion coefficients in NMR spin-echo spectrometers. The author designed and fabricated a quadrupole magnetic field gradient coil and a corresponding pulse current source. The multi-function pulse sequence generator is used to control the generation of magnetic field gradient pulses and radio frequency field pulses to achieve the measurement. Compared with the spin echo method with constant magnetic field gradient, this method has the advantages of no narrowing of the echo signal, accurate measurement, high sensitivity and large measuring range. The minimum measured value has reached 6 × 10 ~ (-13) m ~ 2 / s .