Professor Stuart George Bradley
MSc, PhD (Auckland), FIoA, FRMetS
Research | Current
Turbulence induced noise
Wind-generated acoustic noise in cellular phones or headphones is often the major cause of signal dropout. We use 'quiet' wind tunnels and derive theoretical turbulence-acoustics models based on deriving semi-empirical scaling laws. Funding is by leading European electronics companies.
- Wind Noise in Microphones
Design of new acoustic instruments for remotely-sensing winds and turbulence
We design new SODARs (acoustic equivalent of a RADAR) to bounce sound off turbulent patches in the atmosphere to obtain profiles of wind and turbulence. Current applications are in cities and the Antarctic; flow around wind turbines; and visualising the vortices from landing aircraft.
- Antarctic SODAR array
- High Resolution Wind Profiles
Urban atmospheric environments
Understanding the mechanisms of urban environments is becoming increasingly important for climate change studies and sustainability. Within the 'street canyons' heat and pollutants can be trapped. Our acoustic remote sensing instruments are being used in collaborations with several European groups doing urban studies
- New Measurement Technology for profiling the Urban Boundary Layer
Wind energy optimisation
With increasing size of turbines, an alternative to instrumented masts is urgently required for monitoring turbine performance. We are working with wind energy interests in EU-funded projects to validate use of acoustic remote sensing SODARs for this purpose throughout Europe.
- Calibration of SODAR for Wind Energy Applications
- Use of SODAR in Wind Turbine Performance Measurements
- Visiting Professorship, Manchester UK
- Visiting Professorship, Vienna Austria
Selected publications and creative works (Research Outputs)
- Legg, M., & Bradley, S. (2014). Automatic 3D scanning surface generation for microphone array acoustic imaging. Applied Acoustics, 76, 230-237. 10.1016/j.apacoust.2013.08.008
- Legg, M., & Bradley, S. (2013). A combined microphone and camera calibration technique with application to acoustic imaging. IEEE transactions on image processing : a publication of the IEEE Signal Processing Society, 22 (10), 4028-4039. 10.1109/tip.2013.2268974
- Bradley, S., Perrott, Y., Behrens, P., & Oldroyd, A. (2012). Corrections for wind-speed errors from sodar and lidar in comple terrain. Boundary-Layer Meteorology, 143 (1), 37-48. 10.1007/s10546-012-9702-0
- Behrens, P., O'Sullivan J, Archer, R., & Bradley, S. (2012). Underestimation of monostatic sodar measurements in complex terrain. Boundary-Layer Meteorology, 143 (1), 97-106. 10.1007/s10546-011-9665-6
Other University of Auckland co-authors: John OSullivan
- Legg, M., & Bradley, S. (2012). Comparison of CLEAN-SC for 2D and 3D Scanning Surfaces. 4th Berlin Beamforming Conference Berlin. Related URL.
- Bradley, S. G. (2011). Ground-based Remote Sensing in a Complex Boundary Layer. Paper presented at 48th Oholo Conference "Emerging Remote Sensing Techniques and Associated Modeling for Air Pollution Applications", Eilat, Israel. 6 November - 10 November 2011.
- Bradley, S. G., Valles, B., & von Hünerbein S (2011). Estimation of flow curvature from 5-beam and 9-beam SODARs. Paper presented at 11th EMS Annual Meeting / 10th European Conference on Applications of Meteorology (ECAM), Berlin, Germany. 12 September - 16 September 2011.
- Bradley, S. G., & Mikkelsen, T. (2011). What is the wind speed accuracy of sodars?. Paper presented at 11th EMS Annual Meeting / 10th European Conference on Applications of Meteorology (ECAM), Berlin, Germany. 12 September - 16 September 2011.