| Wood's Glass |
Article Index for Wood's |
Website Links For Woods |
Information AboutWood's Glass |
|
Wood's glass was developed by Robert Williams Wood (1868–1955) as a light filter used in communications during World War I . His "invisible radiation" technique worked both in Infrared daylight communication and Ultraviolet night communications. His glass filter removed the visible components of light beam, leaving only the 'invisible radiation' as a signal beam. Wood's glass is commonly used to form the envelope for ultraviolet fluorescent bulbs ( Black Light ). Wood's glass is special barium-sodium-silicate glass incorporating about 9% nickel oxide. It is a very deep violet-blue glass, opaque to all visible light rays except longest red and shortest violet. It is quite transparent in the violet/ultraviolet in a band between 320 and 400 Nanometre s with a peak at 365 nanometres, and a fairly broad range of infrared and the longest, least visible red wavelengths. SEE ALSO REFERENCES
|
|
|