Homing device for underwater divers
First Claim
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1. An underwater acoustic homing device for a diver with scuba equipment comprising:
- an omnidirectional pulsed underwater sound source;
an underwater sound receiver consisting of a single omnidirectional transducer, an amplifying means connected to said transducer, a band-pass filter connected to said amplifying means, and an amplitude detector means connected to the filter, said transducer being positioned in close proximity to the diver'"'"'s torso and equipment whereby the acoustic discontinuity of the diver'"'"'s torso and equipment causes the strength of the sound to be attenuated at the transducer when the diver'"'"'s torso and equipment are in the sound path between the source and the transducer;
an indicating means connected to the receiver, whereby reception of the unattenuated sound is indicated.
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Abstract
This invention is in the field of underwater ultrasonic communications systems, more particularly, underwater acoustic homing devices suitable for diver direction finding. This invention utilizes a single omnidirectional sound source and a simple receiver, located in close proximity to a scuba diver'"'"'s torso and equipment. The acoustic discontinuity of the diver'"'"'s torso and equipment provides the required directional sensitivity, thus allowing the device to incorporate the desirable characteristics of flexibility in range in combination with a simple receiver housing.
35 Citations
15 Claims
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1. An underwater acoustic homing device for a diver with scuba equipment comprising:
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an omnidirectional pulsed underwater sound source; an underwater sound receiver consisting of a single omnidirectional transducer, an amplifying means connected to said transducer, a band-pass filter connected to said amplifying means, and an amplitude detector means connected to the filter, said transducer being positioned in close proximity to the diver'"'"'s torso and equipment whereby the acoustic discontinuity of the diver'"'"'s torso and equipment causes the strength of the sound to be attenuated at the transducer when the diver'"'"'s torso and equipment are in the sound path between the source and the transducer; an indicating means connected to the receiver, whereby reception of the unattenuated sound is indicated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An underwater acoustic homing device for divers with scuba equipment comprising:
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an omnidirectional continuous wave underwater sound source; an underwater sound receiver consisting of a single omnidirectional transducer, an amplifying means connected to said transducer, a band-pass filter connected to said amplifying means, and an amplitude detector means connected to the filter, said transducer being positioned in close proximity to the diver'"'"'s torso and equipment whereby the acoustic discontinuity of the diver'"'"'s torso and equipment causes the strength of the sound to be attenuated at the transducer when the diver'"'"'s torso and equipment are in the sound path between the source and the transducer; an indicating means connected to the receiver, whereby reception of the unattenuated sound is indicated. - View Dependent Claims (11, 12)
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13. An underwater acoustic homing device for a diver with scuba equipment comprising:
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a spread spectrum underwater sound source; an underwater matched spread spectrum sound receiver consisting of a single omnidirectional transducer, an amplifying means connected to said transducer, a band-pass filter connected to said amplifying means, and an amplitude detector means connected to the filter, said transducer being positioned in close proximity to the diver'"'"'s torso and equipment whereby the acoustic discontinuity of the diver'"'"'s torso and equipment causes the strength of the sound to be attenuated at the transducer when the diver'"'"'s torso and equipment are in the sound path between the source and the transducer; an indicating means connected to the receiver, whereby reception of the unattenuated sound is indicated. - View Dependent Claims (14, 15)
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Specification