International Telephone and Telegraph Corporation

International Standard Electric Corporation

Kevin B Ward

Robert J Kraushaar

The solar blind ultraviolet filter includes in an intimate cascade relationship an ultraviolet grade quartz cell containing chlorine gas receiving light energy on an input face thereof, a first Jena UG5 glass cell containing potassium iodide doped with thallium, a second Jena UG5 glass cell containing a 2, 3-dihydro-5, 7-dimethyl-1H-1, 4-diazepine perchlorate and glycerol solution and a Jena UG5 glass and ultraviolet grade quartz cell containing nickel sulfate hexahydrate as the output element of the filter. A black anodized aluminum shell encloses the peripheral surface of all of the above cells. An extremely high viscosity interface coupling medium, such as dimethyl polysiloxane, is disposed at all interface surfaces of the various materials employed in the filter to minimize reflection losses at these interface surfaces.

Solar blind ultraviolet filter

Solutions of 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)- perchlorate are used as liquid band pass filters for the transmission of U-V.

Liquid band pass filters

An ultraviolet optical filter is provided having a first filter element including a 2,7-dimethyl-diaza-(3,6)-cycloheptadien-(1,6)-perchlorate and second filter element including a crystal of thallium doped potassium iodide. A method for filtering light is also disclosed.

Growing community of inventors

Bayside, NY, United States of America

Kevin B Ward