ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A very sensitive microphone suitable for acoustic measurements in liquid helium is described. With the use of it both, the pressure amplitude of second sound and the amplitude of first sound radiated from the second sound transmitter (carbon layer heater) can be detected. By a special extension of the reciprocity theory the first sound pressure response of the microphone and the second sound transmitter response can be measured. The measured pressure signals of first and second sound are compared with the results of the two-fluid theory.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01392509