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首页> 外文期刊>Journal of Applied Physics >A free‐floating superconducting bolometer—A sensitive heat‐pulse detector
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A free‐floating superconducting bolometer—A sensitive heat‐pulse detector

机译：自由浮动的超导测辐射热计-灵敏的热脉冲探测器

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A free‐floating (no substrate) granular aluminum superconducting bolometer has been made and tested. Sensitivity and time‐constant measurements were compared with those of similar bolometers fabricated on glass and Al2O3 substrates. The responses were first studied with the bolometer isolated in a vacuum chamber which was immersed in a superfluid liquid‐helium bath and cooled by conduction through the contact leads, and again after incremental increases of helium gas were introduced into the sample chamber. The measurements show that for low gas pressures (≲10-4 cm Hg) the floating bolometer was between one and two orders of magnitude more sensitive than identical bolometers on substrates. With increasing gas pressure, the formation of a superfluid helium film of an approximate thickness of three atomic layers caused a reduction of the floating bolometer sensitivity by nearly two orders of magnitude. The effect of bolometers on substrates was, on the other hand, only 30%. The results provide strong evidence that the Kapitza conductance into helium occurs in the first two or three atomic layers.
机译：已经制造并测试了自由浮动（无基材）的颗粒状铝超导热辐射计。将灵敏度和时间常数测量值与在玻璃和Al2O3衬底上制造的类似辐射热计的测量值进行了比较。首先使用隔离在真空室中的辐射热计研究响应，该辐射热计浸入超流体液氦浴中，并通过接触导线的传导进行冷却，然后再将氦气增量增加引入样品室。测量结果表明，对于低气压（≲10-4cm Hg），浮动热辐射计的灵敏度要比基板上相同的热辐射计高一到两个数量级。随着气压的升高，大约三个原子层厚度的超流体氦膜的形成导致浮动辐射热计灵敏度降低了近两个数量级。另一方面，辐射热计对基材的影响仅为30％。结果提供了有力的证据表明，进入氦气的Kapitza电导发生在前两个或三个原子层中。

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    《Journal of Applied Physics》 |1977年第7期|P.2723-2728|共6页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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