为了给物理系学生开设脉冲核磁共振实验,我们研制了一台简单、小型、低成本的自旋回波谱仪。该谱仪工作频率为18MHz,利用一般实验室电磁铁,它可以用于测量液体样品(质子)的自旋—晶格,自旋—自旋弛豫时间T_1和T_2。本文叙述了谱仪的设计和结构,给出了部分电路及由本谱仪摄得的甘油样品的自旋回波讯号。 In order to set up pulsed NMR experiments for physics students, we developed a simple, small, low-cost spin echo spectrometer. Operating at 18 MHz, the spectrometer can be used to measure the spin-lattice, spin-spin relaxation times T_1 and T_2 for liquid samples (protons) using a common laboratory electromagnet. This paper describes the design and structure of the spectrometer and gives the spin echo signals of some circuits and glycerol samples taken by this spectrometer.