Optical filters for accelerated weathering devices
First Claim
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1. An accelerated weathering device comprising:
- a weathering fixture adapted to hold at least one product sample;
an illuminator disposed proximate to the weathering fixture wherein the illuminator comprises a light source and an optical filter disposed proximate to the light source, the optical filter comprising a detectable amount of at least one visible light absorbing component in a total amount of less than 0.5 wt-% based on the total elemental concentration of the optical filter, the remainder of the optical filter comprises one or more inorganic oxides that do not absorb visible or ultraviolet light, andwherein illumination passed through the optical filter hasa first ratio of total irradiance for wavelengths shorter than 290 nm to total irradiance for wavelengths ranging from 300 nm to 400 nm of less than 2.0×
10−
6,a second ratio of irradiance at 310 nm to total irradiance for wavelengths ranging from 300 nm to 400 nm of at least 1.2×
10−
3, anda third ratio of total irradiance at wavelengths ranging from 400 nm to 700 nm to total irradiance at wavelengths ranging from 290 nm to 800 nm of at least 0.6.
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Abstract
Optical filters comprising a small concentration of visible light absorbing components optionally in combination with small concentrations of ultraviolet and infared absorbing components suitable for use in an illuminator for an accelerated weathering device and methods of accelerated weathering.
79 Citations
20 Claims
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1. An accelerated weathering device comprising:
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a weathering fixture adapted to hold at least one product sample; an illuminator disposed proximate to the weathering fixture wherein the illuminator comprises a light source and an optical filter disposed proximate to the light source, the optical filter comprising a detectable amount of at least one visible light absorbing component in a total amount of less than 0.5 wt-% based on the total elemental concentration of the optical filter, the remainder of the optical filter comprises one or more inorganic oxides that do not absorb visible or ultraviolet light, and wherein illumination passed through the optical filter has a first ratio of total irradiance for wavelengths shorter than 290 nm to total irradiance for wavelengths ranging from 300 nm to 400 nm of less than 2.0×
10−
6,a second ratio of irradiance at 310 nm to total irradiance for wavelengths ranging from 300 nm to 400 nm of at least 1.2×
10−
3, anda third ratio of total irradiance at wavelengths ranging from 400 nm to 700 nm to total irradiance at wavelengths ranging from 290 nm to 800 nm of at least 0.6. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current Assignee3M Innovative Properties Company (3M Company)
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Original Assignee3M Innovative Properties Company (3M Company)
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InventorsFischer, Richard M. Jr., Ketola, Warren D.
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Primary Examiner(s)Pritchett; Joshua L
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Application NumberUS11/141,589Publication NumberTime in Patent Office1,141 DaysField of Search359350-359US Class Current359/350CPC Class CodesG01N 17/002 Test chambersG02B 5/208 for use with infrared or ul...G02B 5/226 Glass filters
