SUN-BLIND LENS Russian patent published in 2011 - IPC G02B13/14 

FIELD: physics.

SUBSTANCE: proposed lens comprises casing accommodating optical unit incorporating set of focusing lenses and filter glasses, and crystalline filter with pass band of 220-320 nm, and photo receiver arranged there behind. Input lens is arranged ahead of optical lens. Extra output optical unit is arranged behind crystalline filter with set of focusing lenses and filter glasses. Casing inner surface is provided with absorbing coat, while filter glasses of both sets are furnished with interference coats. Crystalline filter and other filter elements allow filtration outside pass band. Crystalline filter may be made up of monocrystal of one of Tutton salts, for example, cesium-nickel sulphate hexahydrate Cs₂Ni(SO₄)₂·6H₂O. Optical dull black enamel may be used as absorbing coat.

EFFECT: possibility to detect weak radiation, for example, corona charge in whatever ambient conditions.

4 cl, 1 dwg