1968-03-27
1977-01-18
Moskowitz,, Nelson
350318, G02B 528
Patent
active
040036359
ABSTRACT:
A narrow-band interference filter is placed in the path of reflected opti energy for rejecting undesirable signals to thereby improve the signal-to-noise ratio. The interference filter functions as a bandpass filter having a center frequency centered around the frequency of the transmitted optical beam. The filter includes four identical quarter annulus sections, each composed of a mosaic of interference filter elements cemented to a glass substrate. Each substrate is itself positioned within a skeletal spider structure to provide the desired shape and rigidity.
REFERENCES:
patent: 3165749 (1965-01-01), Cushner
patent: 3339457 (1967-09-01), Pun
patent: 3410626 (1968-11-01), Magrath
Oigarden Tarald H.
Ottersberg Walter H.
Rubertone Michael T.
Hansen Henry
Moskowitz Nelson
Rubens G. J.
The United States of America as represented by the Secretary of
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