The remote measurement of tornado-like flows employing a scanning laser Doppler systemThe paper deals with a scanning laser Doppler velocimeter system employed in a test program for measuring naturally occurring tornado-like phenomena, known as dust devils. A description of the system and the test program is followed by a discussion of the data processing techniques and data analysis. The system uses a stable 15-W CO2 laser with the beam expanded and focused by a 12-inch telescope. Range resolution is obtained by focusing the optical system. The velocity of each volume of air (scanned in a horizontal plane) is determined from spectral analysis of the heterodyne signal. Results derived from the measurement program and data/system analyses are examined.
Document ID
19780033147
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Jeffreys, H. B. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Bilbro, J. W. (NASA Marshall Space Flight Center Huntsville, Ala., United States)
Dimarzio, C. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Sonnenschein, C. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Toomey, D. (Raytheon Co. Sudbury, Mass., United States)