Laser velocimetry detection of underwater sound
First Claim
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1. An apparatus for detecting sound waves in a given bandwidth along an axis comprising:
- a liquid medium having a plurality of gas bubbles;
laser generating means for transmitting a light pulse interacting with said wave of acoustic energy;
detector means for receiving backscattered light from the interaction of the light pulse and the bubbles excited by the wave of acoustic energy, the scattered light being in a bandwidth that includes the given bandwidth of the acoustic energy;
processing means responsive to said detector means for determining a distance traveled and time of travel for the acoustic wave through the fluid medium; and
control means for synchronizing the operations of said laser generator means, said detector means and said processing means.
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Abstract
An apparatus for determining the velocity of sound waves which includes a liquid medium having a plurality of gas bubbles. In the liquid medium, a laser transmits a light pulse to interact with the bubbles excited by the sound wave. Backscattered light from the interaction of the light pulse is received. A processor is then responsive to the detector to provide detection of the acoustic wave through the fluid medium.
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14 Claims
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1. An apparatus for detecting sound waves in a given bandwidth along an axis comprising:
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a liquid medium having a plurality of gas bubbles;
laser generating means for transmitting a light pulse interacting with said wave of acoustic energy;
detector means for receiving backscattered light from the interaction of the light pulse and the bubbles excited by the wave of acoustic energy, the scattered light being in a bandwidth that includes the given bandwidth of the acoustic energy;
processing means responsive to said detector means for determining a distance traveled and time of travel for the acoustic wave through the fluid medium; and
control means for synchronizing the operations of said laser generator means, said detector means and said processing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for detecting sound waves in a given bandwidth along an axis comprising:
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a first liquid medium;
a second medium having a plurality of gas bubbles therein and said second medium having a longitudinal axis in intersecting relation to the axis of the wave of acoustic energy;
laser generating means for transmitting a light pulse;
detector means for receiving scattered light from the interaction of a light pulse and the bubbles excited by the wave of acoustic energy, the scattered light being in a bandwidth that includes the given bandwidth of the acoustic energy;
processing means responsive to said detector means for determining a distance traveled and time of travel for the acoustic wave through the fluid medium; and
control means for synchronizing the operations of said laser generator means, said detector means and said processing means. - View Dependent Claims (10, 11, 12, 13)
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14. A method for detecting and determining the characteristics of sound waves in a liquid medium comprising the steps of causing a light pulse to interact with said sound wave and obtain detection, wherein the improvement comprises providing a plurality of gas bubbles in said liquid medium and measuring the radial velocity of the walls of the gas bubbles.
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