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NON-INVASIVE MEASUREMENTS OF UNDERWATER PRESSURE FIELDS USING LASER DOPPLER VELOCIMETRY

✍ Scribed by A.R. HARLAND; J.N. PETZING; J.R. TYRER

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
183 KB
Volume
252
Category
Article
ISSN
0022-460X

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✦ Synopsis

The propagation of mechanical sound waves in dense media such as water is central to many communication and imaging techniques used in naval and medical environments. Knowledge of the spatial and temporal pressure variation within the acoustic "eld is of signi"cant importance for many users and many techniques have been developed to facilitate this need. Work has been done in attempting to theoretically predict the acoustic

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This paper deals with the processing of signals resulting from the measurement of sound "elds using the laser Doppler velocimetry technique. For such an application, the problem lies in the demodulation of signals whose instantaneous frequencies have small and fast variations. Two frequency trackers