System and method for detecting underwater objects having a shifted frequency
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A system for detecting an underwater object includes an optical signal generator operable to generate and transmit an optical signal into the water. The system also includes an absorption cell operable to receive the optical signal reflected from the water and absorb an unshifted frequency component of the reflected optical signal. The system further includes a detector operable to receive a shifted frequency component of the optical signal from the absorption cell and detect the object using the shifted frequency component of the optical signal. Displacement of the water by the object causes an absence of a portion of the shifted frequency component of the optical signal.
Fry, Edward S.; Kattawar, George W.; Walther, Thomas; Pan, Xioajiang (2002). System and method for detecting underwater objects having a shifted frequency. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from