Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1981-02-17
1985-01-22
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
372 94, G01C 1964
Patent
active
044948735
ABSTRACT:
A photon absorber minimizes the mixing of unwanted reflected electromagnetic waves with the main clockwise and counter-clockwise propagating electromagnetic waves of a ring laser gyroscope. A round hole in the middle of the absorber allows the main waves to pass and an angulated front surface deflects reflected waves away from the main waves. Most of the reflected waves which impinge on the photon absorber are absorbed. A photon absorber is fabricated from light absorbing filter glass with anti-reflection coatings or from beryllium-copper with an absorptive coating.
REFERENCES:
patent: 3214596 (1965-10-01), Schwerdt, Jr. et al.
patent: 4272158 (1981-06-01), Johnston, Jr. et al.
patent: 4284329 (1981-08-01), Smith et al.
D. R. McKenzie, "Selective Nature of Gold-Black Deposits; Journal Optical Society of America, vol. 66, No. 3, Mar. 1976, pp. 249-253.
Clampitt Lawrence L.
Perlmutter Michael
Dawson Walter F.
McGraw Vincent P.
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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