Method for covering ultraviolet sources

Details Method for covering ultraviolet sources Method for covering ultraviolet sources

1981-03-03

1983-04-26

Arnold, Bruce Y.

350311, 350320, G02B 522

Patent

active

043811361

ABSTRACT:
Disclosed is a method for covering a source emitting ultraviolet radiation which method comprises covering said source with an acrylic glass colored with a coloring agent which absorbs in the visible region of the spectrum between 400 nanometers and 550 nanometers and exhibits an absorption of at least 2 percent for any wavelength within this region, and which agent concurrently has an average degree of transmission in the A- and B-region of the ultraviolet spectrum which is not below 55 percent and is not less than 10 percent at any wavelength in this region, said agent being present at a concentration equivalent to 0.0005 to 0.3 percent by weight in a layer, one millimeter thick, of a radiation absorbing matrix. Also disclosed are colored acrylic glass covers for use in such a method.

REFERENCES:
patent: 1945567 (1934-02-01), Rolph
patent: 4167490 (1979-09-01), Looney
Pasco et al., Optics and Laser Technology 10, 71-76 (1978).

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