Remote Measurement Utilizing NASA's Scanning Laser Doppler Systems Volume 2 — Final Report Laser Doppler Dust Devil Velocity Profile Measurement Program

摘要

In the Spring of 1975, NASA initiated a program using the available LDV equipment to monitor and record velocity data over the entire vortex core. The LDV equipment is uniquely suited to this requirement due to its ability to measure fluid velocity at different spatial positions with good resolution and without perturbing the fluid flow as does an anemometer or balloon. A field engineering team from Lockheed-Huntsyille, recently returned from measuring aircraft vortices for NASA at Kennedy International Airport in New York, was assembled to operate the test site. This support group was given the task of modifying the available equipment, preparing the test site, operating the equipment and in conjunction with NASA, personnel, collecting and analyzing the data obtained.nTest site location was selected on the basis of records of previous dust devil occurences throughout the Southwest. The primary and secondary site locations were at positions of maximum previously recorded dust devil activity. The candidate sites were: (1) Gila Indian Reservation located just outside of Tempe, Arizona, near Phoenix, and (2) a backup site near Tucson, Arizona. Use of the primary preferred site was dependent on approval of access by the Indian tribal council. This approval was received just prior to the beginning of the test program.