Heterodyned Seismic Source
First Claim
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1. An apparatus for generating phase encoded heterodyned seismic signals comprising:
- a) a frame for mounting two or more ultrasonic transducers,b) one or more ultrasonic carrier transducers to generate a carrier frequency, andc) one or more encoded ultrasonic transducers to generate an encoded ultrasonic signal,wherein said frame places the ultrasonic transducers (b) and (c) at the precise distance to generate a heterodyned seismic signal, and the encoded ultrasonic signal (c) is shifted from the carrier frequency (b) by 0-1000 Hz.
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Abstract
The invention relates to an apparatus for generating heterodyned seismic signals as well as methods of using the heterodyned signals and a system for generating the heterodyned seismic signals. The heterodyned signals can be used near sensitive marine animals because the source frequencies are ultrasonic and the heterodyned seismic signal is generated in a narrow beam.
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Citations
20 Claims
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1. An apparatus for generating phase encoded heterodyned seismic signals comprising:
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a) a frame for mounting two or more ultrasonic transducers, b) one or more ultrasonic carrier transducers to generate a carrier frequency, and c) one or more encoded ultrasonic transducers to generate an encoded ultrasonic signal, wherein said frame places the ultrasonic transducers (b) and (c) at the precise distance to generate a heterodyned seismic signal, and the encoded ultrasonic signal (c) is shifted from the carrier frequency (b) by 0-1000 Hz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of recording seismic data comprising:
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a) deploying seismic recorders; b) deploying an ultrasonic source for generating a phase encoded heterodyned seismic signal; c) transmitting a phase encoded heterodyned seismic signal; and d) recording phase encoded seismic data; wherein said ultrasonic source for generating phase encoded seismic signal comprises (i) a frame for mounting two or more ultrasonic sources, (ii) one or more ultrasonic carrier sources, and (iii) one or more encoded ultrasonic sources, wherein said frame (i) places the ultrasonic sources (ii) and (iii) at the precise distance to generate a heterodyned seismic signal, and said encoded ultrasonic signal (iii) is shifted from the carrier frequency (ii) by 0-1000 Hz. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for generating a heterodyned seismic signal comprising:
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a) a carrier ultrasonic source for generating one or more ultrasonic carrier signals, b) an encoded ultrasonic source for generating one or more phase encoded ultrasonic signals, c) a computer for generating a carrier and phase encoded ultrasonic signals that are heterodyned to generate one or more phase encoded seismic signals, and wherein said ultrasonic source for generating phase encoded seismic signals comprises (i) a frame for mounting two or more ultrasonic sources, (ii) one or more ultrasonic carrier sources, and (iii) one or more encoded ultrasonic sources and said frame (i) places the ultrasonic sources (ii) and (iii) at the precise distance to generate a heterodyned seismic signal, and said encoded ultrasonic signal (iii) is shifted from the carrier frequency (ii) by 0-1000 Hz. - View Dependent Claims (20)
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Specification