Laser Doppler Measurement of Water Velocity.

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Abstract:

The feasibility of measuring ships speed by the doppler shift in light scattered from a laser beam is investigated. Theoretical aspects of the Doppler effect and optical processing are discussed. The significant design parameters are enumerated and the effects of each analyzed. Problems encountered while testing a bread-board model of a laser water speed sensor reveal certain design criteria and aid in a model design review. It is concluded that with lasers available today the laser log concept is feasible, but difficult and expensive to implement. Optical heterodyning of the source and scattered laser beams results in a signal, readily amenable to electronic processing, but often hidden in noise. It is also concluded that the characteristics of a laser doppler speed-sensing system make it far more valuable as a laboratory tool for studying small-scale flow phenomena and turbulence. Author

Author(s):
Rockett, Paul D. ; Laster, D. R. ; Decker, W. A.
Author Organization(s):
NAVAL SHIP RESEARCH AND DEVELOPMENT LAB ANNAPOLIS MD
Descriptive Note:
Research and development rept.,
Pagination:
0040

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ELECLAB-224/68, NSRDC-2433
Task Number(s):
4909, 0401
Project Number(s):
SF013-09-01, SR011-01-01
Monitor Series:
2433
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*FLOWMETERS, PERFORMANCE(ENGINEERING)), (*LASERS, DOPPLER EFFECT), DOPPLER SYSTEMS, COHERENT SCATTERING, LAMINAR FLOW, TURBULENCE, COHERENT RADIATION, SCATTERING, WATER, VELOCITY, MEASURING INSTRUMENTS, MODEL TESTS, CALIBRATION
Field(s)/Group(s):
Lasers and Masers, Test Facilities, Equipment and Methods
Keyword(s):
MIXERS(OPTICS), SIGNAL PROCESSING, WATER VELOCITY
Report Date:
1970 Mar 01