| Abstract: | An acoustic interferometer was built and operated during nocturnal temperature inversions to detect atmospheric temperature differences between the surface air and that at 50 m above the ground. The system departs from earlier succesful designs by using a time-multiplexed two-sided approach to attempt to correct for phase fluctuations caused by wind. Preliminary results from the apparatus indicate that the signals lack the necessary phase stability to permit calculation of temperature, even when subjected to averaging over 20-min intervals. It is concluded that simultaneous insonification of the scattering volume is a requisite for stable phase measurements in such a system. |
