超流動ヘリウム用超音波液面計
1985 年 20 巻 1 号 p. 25-29
詳細
1985 年 20 巻 1 号 p. 25-29
It is necessary to monitor the liquid-level of superfluid helium (He II) in order to control the refrigeration system of He II. One approach to detect the liquid-level of He II by means of ultrasonic waves is shown in this paper. The experimental results are greatly satisfactory. Heat powers brought into He II bath are below 0.1μW. The measuring error is 1.5%. Other advantage is that this liquid-level meter can be used for any liquid.
