Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006njph....8..128s&link_type=abstract
New Journal of Physics, Volume 8, Issue 8, pp. 128 (2006).
Physics
9
Scientific paper
We have measured the effect of colliding two phonon sheets together at different angles. At small angles they interact strongly and a hot line is formed along the line of intersection of the two sheets. At angles between ~13° and ~27° the interaction becomes weaker and less energy goes into the hot line. At angles greater than ~27° there is no interaction between the sheets and they pass through each other. By delaying one sheet with respect to the other, the path of the hot line can be shifted laterally. Using this behaviour, we show that the sensitive area of the bolometer is around 10-2 mm2. We have measured the profile of the hot line and find that its width, typically 1 mm, varies as 1/sin(α/2), where α is the angle between the two sheets. We analyse the data and estimate that the typical angle between two phonons interacting by the three phonon process varies between 8.4° and 12.5°, depending on their energy. We model the formation of the hot line when the sheets are strongly interacting. From the model and the measured data, we find that the temperature of the hot line decreases, and the cone angle and energy density of the hot line increases, with both increasing energy density in the sheets and increasing angle α.
Smith H. S. D.
Vovk R. V.
Williams C. D. H.
Wyatt A. F. G.
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