Modular high accuracy tracker for dual channel laser Doppler velocimeterIn the study described, a scanning dual-channel cross-beam laser Doppler velocimeter (developed for measuring simultaneously the two orthogonal components of flow velocity and turbulence intensity) was used to measure the instantaneous velocity characteristics of a model helicopter rotor and in a vortex wake survey experiment on a Boeing 747 aircraft model. Particular attention is given to a special purpose dual-loop frequency tracker developed to track and demodulate 10 microsecond wide pulse burst Doppler signals with a study cycle of 25% (or narrower signals at a higher duty cycle) generated by the laser Doppler velocimeter.
Document ID
19770061449
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Fridman, J. D. (Raytheon Co. Sudbury, MA, United States)
Young, R. M. (Raytheon Co. Sudbury, MA, United States)
Seavey, R. E. (Raytheon Equipment Development Laboratories Sudbury, Mass., United States)
Orloff, K. L. (NASA Ames Research Center Moffett Field, Calif., United States)