Apparatus and method of underwater optical recording

Details Apparatus and method of underwater optical recording Apparatus and method of underwater optical recording

1988-10-24

1989-10-24

Adams, Russell E.

354 64, G03B 300

Patent

active

048765651

ABSTRACT:
Underwater photography apparatus of the type disclosed in U.S. Pat. No. 4,707,094 is improved to overcome problems from backgrounds or other "non-clear water" conditions by inclusion of a nulling loop in the operating circuitry. Such nulling loop includes a synchronous linear modulator, an algebraic subtracter, a synchronous demodulator and a low-pass filter.

REFERENCES:
patent: 3583299 (1971-06-01), Land
patent: 3751154 (1973-08-01), Frazee et al.
patent: 4065778 (1977-12-01), Harvey
patent: 4707094 (1987-11-01), Tusting
patent: 4777501 (1988-10-01), Caimi et al.

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