台式核磁共振仪变温探头系统的研制

变温探头系统是拓展低场强核磁共振仪应用领域的重要部件. 半导体致冷片由于体积小，功耗低，控制方便，广泛应用于各种制冷场合. 本研究利用半导体致冷组件研制的变温探头系统能实现-20 ℃~60 ℃范围变温，相比传统高场强核磁共振波谱仪变温探头系统，结构简单、性价比高. 在NMI20-analyst台式核磁共振仪上应用3.5%的CuSO₄水溶液对本变温系统进行了测试，实验效果能够体现出相应的规律，具有实用价值. 最后对系统与实验结果进行了讨论，给出了改进方案.

A Variable emperature Probe System for Desktop Nuclear Magnetic Resonance Analytic Instrument

Variable-temperature probe system is a key component in the desktop nuclear magnetic resonance analytic instrument. Semiconductor frigorific flake has been widely used as the frigorific element in various applications because of the advantages it possesses including small volume, low power loss and being easy to control. In this work, semiconductor frigorific modules were used as key components to develop a variable temperature probe system, with which the sample temperature could be varied from -20 ℃ to 60 ℃. The performance of the probe system was tested on an NMI20-Analyst desktop nuclear magnetic resonance analytic instrument with 3.5% CuSO₄ solution as the sample. It was shown that, compared to the conventional variable-temperature probe system, the probe system developed has a relatively simple structure and high performance to cost ratio. The potential improvements for the variable-temperature probe system were also discussed.