论文标题
在无低温低温恒温器中的脉冲管低温冷却器中主动抑制温度振荡：第2部分。实验实现
Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 2. Experimental realization
论文作者
论文摘要
由封闭循环冷冻冷却器冷却的无低温低温恒温器是紧凑的，可以提供不间断的长期操作（长达一万小时），适合于从3 K到300 K的温度。但是，其内在温度振荡限制了其在实验中的应用，需要在低温下（低于77 K）（低于77 K）。被动抑制方法是有效的，但都有缺点。我们描述了一种比传统比例综合（PI）控制更有效的新型活跃抑制方案。实验结果表明，与PI反馈相比，它可以将温度振荡的标准偏差降低30％。据我们所知，这是第一次使用无低温低温恒温器实施这种主动抑制温度振荡。但是，结果还表明，将产生不需要的较低频率热噪声，这似乎是该方法的极限。然而，该方法可用于改善所有无低温低温器的温度稳定性。
A cryogen-free cryostat cooled by a closed cycle cryocooler is compact, can provide uninterrupted long-term operation (up to ten thousand hours) and is suited to temperatures from 3 K to 300 K. Its intrinsic temperature oscillation, however, limits its application in experiments requiring high thermal stability at low temperature (below 77 K). Passive suppression methods are effective but all suffer from drawbacks. We describe a novel, active suppression scheme more efficient than traditional proportional-integral (PI) control. The experimental results show that it can reduce the standard deviation of the temperature oscillation by a further 30% compared with PI feedback. To the best of our knowledge, this is the first time such active suppression of temperature oscillations has been implemented with the cryogen-free cryostat. The results also show, however, that an unwanted lower frequency thermal noise will be generated, which appears to be the limit of the method. Nevertheless, the approach could be used to improve the temperature stability in all cryogen-free cryostats.
