The Sound Field of a Moving Laser-Induced Acoustic Array (Theory).

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Abstract:

This report describes the theoretical investigation of the sound field radiated by a moving laser source. When an intensity modulated laser beam illuminates a column of water, it produces a highly directive thermoacoustic array or optoacoustic antenna. This report discusses a time domain approach for predicting the pressure field radiated by a moving subsonic, transonic, or supersonic thermoacoustic array. The theory is based on a convolution type summation between the impulse response of the thermoacoustic array and the laser pulse intensity. The theoretical model is for both nearfield and farfield radiation and for any Mach number of the source. Keywords include Thermoacoustic array Optoacoustic antenna Impulse response Step response Convolution and Exponential shading.

Author(s):
Berthelot, Y. H. ; Busch-vishniac, I. J.
Author Organization(s):
TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
Descriptive Note:
Technical rept.,
Pagination:
0057

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARL-TR-84-21
Contract/Grant Number(s):
N00014-82-K-0425
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.3_Educating
Modernization Areas:
Cyber; Quantum Science and Computing
Communities of Interest:
Weapons Technologies
Descriptor(s):
*ACOUSTIC ARRAYS, *ACOUSTOOPTICS, SOURCES, THERMODYNAMICS, WATER, THEORY, MODEL THEORY, INTENSITY, MOTION, ARRAYS, PULSED LASERS, LASERS, LASER BEAMS, LASER APPLICATIONS, PULSES, RESPONSE, PRESSURE, MACH NUMBER, MODULATION, TIME DOMAIN, ACOUSTIC FIELDS, CONVOLUTION, APPROACH
Field(s)/Group(s):
Lasers and Masers, Acoustics
Keyword(s):
Optoacoustic antennas, Thermacoustic arrays
Report Date:
1984 Dec 04