He II在第二声波激发下电活动研究的新实验
New experiments on the study of the electric activity of He II at the excitation of second-sound waves
摘要：
本文报道了超流氦（He Ⅱ）在二次声波激发下的电响应的新实验结果，实验中采用了一种带介质盒的声谐振器，由于在谐振器的外壁上设置了测量电极和测辐射热计，从而实现了电信号和热信号的同时测量。我们测量了面电极之间的电势差，以及沿谐振器外壳布置的环形金属电极之间的电位差，这些环形金属电极彼此绝缘并与氦气绝缘。结果表明，在驻波二次声波中，沿谐振腔的电势分布与温度分布一致。在所研究的温度、频率和热流功率的整个范围内，第二声波中的ΔT/ΔU之比是一个常数，等于2.3{ \cdot }10^（4）K/V。
英文摘要：
We present the results of new experiments on the observation of the electric response of superfluid helium (He II) at the excitation of second-sound waves in it. We used an acoustic resonator with dielectric case, in which the measurements of the electric and thermal signals were carried on simultaneously due to the disposition of a measuring electrode and a bolometer on the face wall. We measured the potential differences between the face electrodes, as well as between ring metallic electrodes disposed along the resonator case which were insulated from one another and from helium. It is shown that the distribution of the electric potential along the resonator coincides with that of the temperature in a standing second-sound wave. It is established that the ratio ΔT/ΔU in a second-sound wave is a constant equal to 2.3{\cdot}10^(4) K/V in the whole regions of temperatures, frequencies, and heat flow powers under study.
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