Accession Number:

ADA625855

Title:

Acoustic Tomography of the Atmospheric Surface Layer

Descriptive Note:

Final rept. 1 Sep 2010-31 Aug 2014

Corporate Author:

COLORADO UNIV AT BOULDER

Report Date:

2014-11-28

Pagination or Media Count:

19.0

Abstract:

Acoustic tomography of the atmospheric surface layer ASL is based on the measurements of the travel times of sound propagation between speakers and microphone which constitute a tomography array. The travel times are then used as input parameters in the inverse algorithms for reconstruction of temperature and wind velocity fields. In this project, we have continued our long-term theoretical and experimental studies of acoustic tomography of the ASL. The inverse algorithms for the tomographic reconstruction were modified and extended. In particular, two algorithms were developed for the assessment and elimination of the systematic errors in the travel-time measurements. The algorithms were applied for the reconstruction of the turbulence fields from the travel times obtained with the acoustic tomography array at the Boulder Atmospheric Observatory BAO. The BAO tomography array was also used for measurements of the area-averaged values of temperature, wind velocity, and horizontal heat flux. To improve a spatial resolution of an ultrasonic anemometer, it was suggested that one consider it is as a small acoustic tomography array and apply appropriate inverse methods for reconstruction of temperature and velocity. The upgrades of the BAO acoustic tomography array were completed and new experiments were carried out.

Subject Categories:

  • Atmospheric Physics
  • Acoustic Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE