Wood's glass
This article includes a list of general references, but it lacks sufficient corresponding inline citations. (August 2016) |
Wood's glass is an
History
Wood's glass was developed as a light filter used in communications during
Composition
Wood's glass is special
Properties and uses
Wood's glass has lower
The nickel and barium oxides are also chemically reactive, with tendency to slowly form a layer of hydroxides and carbonates in contact with atmospheric moisture and carbon dioxide.
The susceptibility to thermal shock makes manufacture of hermetically sealed glass bulbs difficult and costly. Therefore, most contemporary "
With prolonged exposure to ultraviolet radiation, Wood's glass undergoes
Photographic filters for ultraviolet photography, notably the Kodak Wratten 18A and 18B, are based on Wood's glass.[5][citation needed]
Health effects
Bulbs made of Wood's glass are potentially hazardous in comparison with those made of enameled glass, since the reduced visible light output may cause observers to be exposed to unsafe levels of UV, because the source appears dim. The low output of black lights is not considered sufficient to cause DNA damage or cellular mutations, but excessive exposure to UV can cause temporary or permanent damage to the eye.
See also
- Black light
- Dichroic filter
- Wood's lamp
References
- ^ Williams, Robin; Gigi Williams (2002). "Wood, Professor Robert Williams". Pioneers of Invisible Radiation Photography. RMIT Online University, Melbourne, Australia. Retrieved January 16, 2013.
- ^ "Invisible Signals". Proceedings of the United States Naval Institute. 45 (10). Annapolis, Maryland: U.S. Naval Institute: 1794–1796. October 1919. Retrieved 27 March 2013.
- ^ Rodgers, John, ed. (1920). "Secret signaling by light rays". Kline Geology Laboratory. American Journal of Science. 49. New Haven: Yale University: 214–216. Retrieved 27 March 2013.
- ^ "...a BLB [black light bulb] has a thin coating of a visible wavelength (VIS) filter generally applied to the inner wall of the bulb" from "Part I: Lighting and its effects on color-grading diamonds" (PPT). AGA Task Force on Lighting and Color-Grading. Accredited Gemologists Association. 3 February 2010. Retrieved 27 March 2013. See also the 2009 report: "Part I: Lighting and its effects on color-grading diamonds" (PPT). AGA Task Force on Lighting and Color-Grading. Accredited Gemologists Association. 4 February 2009. Retrieved 20 April 2018.
- RMIT University.
Further reading
- Wood, R. W. (1919). "Secret communications concerning light rays". Journal of Physiology. 5e (IX).
- Margarot, J.; Deveze, P. (1925). "Aspect de quelques dermatoses lumiere ultraparaviolette. Note preliminaire". Bulletin de la Société des sciences médicales et biologiques de Montpellier (in French). 6: 375–378.
- Williams, Robin, Prof.; Williams, Gigi. "Prof. Robert Williams Wood". Pioneers of invisible radiation photography. Archived from the original on 2011-04-07.
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