Oscillating Superleak Second Sound Transducers
Abstract
The construction and performance of mechanical transducers suitable for generating and detecting second sound in pure 4He, and also in dilute 3He-4He mixtures at millidegree temperatures, are described. It is shown that when the normal fluid density is small, the behavior of the transducers can be explained by a simple acoustical model which enables their sensitivity, frequency response, and reflection coefficient to be calculated in terms of easily measured parameters.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- November 1970
- DOI:
- 10.1063/1.1684354
- Bibcode:
- 1970RScI...41.1603S