Two-dimensional rotorcraft downwash flow field measurements by lidar-based wind scanners with agile beam steering

Journal of Atmospheric and Oceanic Technology

Volumn 31, Issue 4, 2014, Pages 930-937

  Sjöholm, Mikael ^a   Angelou, Nikolas ^a   Hansen, Per ^a   Hansen, Kasper Hjorth ^a   Mikkelsen, Torben ^a   Haga, Steinar ^b   Silgjerd, Jon Arne ^b   Starsmore, Neil ^c  

^a TECHNICAL UNIVERSITY OF DENMARK   (Denmark)

^b Automasjon og Data AS   (Norway)

^c Starsmore Ltd   (United Kingdom)

Author keywords

Airflow; Instrumentation sensors; Lidars Lidar observations; Remote sensing; Turbulence; Wind

Indexed keywords

FLOW FIELDS; GROUND OPERATIONS; HELICOPTER ROTORS; HELICOPTERS; OPTICAL RADAR; REMOTE SENSING; ROTORS; SCANNING; TURBULENCE; TWO DIMENSIONAL; WIND;

AIRFLOW; DEGRADED VISUAL ENVIRONMENTS; FLOW FIELD MEASUREMENT; INSTRUMENTATION/SENSORS; LIDARS/LIDAR OBSERVATIONS; LINE-OF-SIGHT COMPONENTS; SEARCH-AND-RESCUE HELICOPTERS; TECHNICAL UNIVERSITY OF DENMARK;

WAKES;

AIRFLOW; DOPPLER LIDAR; REMOTE SENSING; TURBULENCE; WIND FIELD; WIND MEASUREMENT;

EID: 84898848342     PISSN: 07390572     EISSN: 15200426     Source Type: Journal    
DOI: 10.1175/JTECH-D-13-00010.1     Document Type: Article

References (14)

1. Angelou, N., F. Foroughi Abari, J. Mann, T. Mikkelsen, and M. Sjöholm, 2012a: Challenges in noise removal from Doppler spectra acquired by a continuous-wave lidar. Proc. 26th Int. Laser Radar Conf., Porto Heli, Peloponnesus, Greece, ILRC, S5P-01. [Available online at http://orbit.dtu.dk/fedora/objects/ orbit:113163/datastreams/file_9824562/content.]
2. Angelou, N., J. Mann, M. Sjöholm, and M. Courtney, 2012b: Direct measurement of the spectral transfer function of a laser based anemometer. Rev. Sci. Instrum., 83, 033111, doi:10.1063/ 1.3697728.
3. Fiorino, S. T., J. A. Deibel, P. M. Grice, M. H. Novak, J. Spinoza, L. Owens, and S. Ganti, 2012: A technique to measure optical properties of brownout clouds for modeling terahertz propagation. Appl. Opt., 51, 3605-3613.
4. Gottschall, J., M. S. Courtney, R. Wagner, H. E. Jorgensen, and I. Antoniou, 2012: Lidar profilers in the context of wind energy-A verification procedure for traceable measurements. Wind Energy, 15, 147-159, doi:10.1002/we.518.
5. Hogenboom, D., and C. DiMarzio, 1998: Quadrature detection of a Doppler signal. Appl. Opt., 37, 2569-2572.
6. Jansen, C., A. Wennemers, W. Vos, and E. Groen, 2008: Flytact: A tactile display improves a helicopter pilot's landing performance in degraded visual environments. Haptics: Perception, Devices and Scenarios, M. Ferre, Ed., Lecture Notes in Computer Science, Vol. 5024, Springer, 867-875.
7. Karlsson, C. J., F. A. Olsson, D. Letalick, and M. Harris, 2000: Allfiber multifunction continuous-wave coherent laser radar at 1.55μm for range, speed, vibration, and wind measurements. Appl. Opt., 39, 3716-3726, doi:10.1364/AO.39.003716.
8. Mikkelsen, T., J. Mann, M. Courtney, and M. Sjöholm, 2008: Windscanner: 3-D wind and turbulence measurements from three steerable Doppler lidars. IOP Conf. Ser.: Earth Environ. Sci., 1, 012018, doi:10.1088/1755-1315/1/1/012018.
9. Milluzzo, J., and J. G. Leishman, 2010: Assessment of rotorcraft brownout severity in terms of rotor design parameters. J. Amer. Helicopter Soc., 55, 032009, doi:10.4050/JAHS.55.032009.
10. Newsom, R., R. Calhoun, D. Ligon, and J. Allwine, 2008: Linearly organized turbulence structures observed over a suburban area by dual-Doppler lidar. Bound.-Layer Meteor., 127, 111-130, doi:10.1007/s10546-007-9243-0.
11. Roy, G., X. Cao, S. Roy, and E. Trickey, 2012: Assessment of helicopter brownout with a scanning lidar. Conf. on Lasers and Electro-Optics (CLEO), San Jose, CA, IEEE, ATu2G.5, doi:10.1364/CLEO_AT.2012.ATu2G.5.
12. Sjöholm, M., P.Weibring, H. Edner, and S. Svanberg, 2004: Atomic mercury flux monitoring using an optical parametric oscillator based lidar system. Opt. Express, 12, 551-556.
13. Sjöholm, M., T. Mikkelsen, J. Mann, K. Enevoldsen, and M. Courtney, 2009: Spatial averaging-effects on turbulence measured by a continuous-wave coherent lidar. Meteor. Z., 18, 281-287.
14. Wadcock, A., L. Ewing, E. Solis, M. Potsda, and G. Rajagopalan, 2008: Rotorcraft downwash flow field study to understand the aerodynamics of helicopter brownout. American Helicopter Society Southwest Region Specialists Meeting on Next Generation Vertical Lift Technologies, AHSI, 528-554.