Variable rotation and irradiation weathering testing machine
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United States of America Patent
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Dec 29, 1998
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N/A
app pub date -
Nov 8, 1996
filing date -
Nov 8, 1996
priority date (Note) -
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Abstract
Material samples may be tested for weathering by a method which comprises securing the samples to a rack which rotates about a central radiation source, and exposing the samples to irradiation from the source at a first intensity of at least about 1.5 SUNS, while rotating the rack at a rate of at least about 6 rpm. Alternatively, a lower radiation intensity may be provided from the same apparatus, using a lower rotation rate. The method may also comprise a step of varying the inductance of a circuit supplying power to the central radiation source as one changes the intensity of the irradiation, to enhance the constancy of spectral distribution of the irradiation at the different intensities.
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