✦ LIBER ✦

Distortion of temperature signals in He II due to probe geometry, and a new improved probe

✍ Scribed by M.v. Schwerdtner; W. Poppe; D.W. Schmidt

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 260 KB
Volume: 29
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(89)90039-8

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✦ Synopsis

The influence of the geometry of the bolometer on the recorded shape of a second-sound signal in a one-dimensional channel was investigated. It appears that, depending on the geometry of the bolometer, the incoming simple positive pulse can generate secondary effects leading to the appearance of a temperature undershoot. The geometrical effects can be of the same order of magnitude as the true signal. A new type of second-sound probe is presented which avoids this unwanted transformation of the incoming signal.