FIELD: measuring technique.
SUBSTANCE: method comprises comparing the specimen with unknown reflection coefficient with a standard having known reflection coefficient by means of an auxiliary arrangement for the spectrophotometer. The measurements of the reflection coefficient that is less than 20% are performed with the use of a standard that is made of a plate with black back side made of an optical glass with known reflection coefficient. To measure a more than 20% reflection coefficient, a standard is made of a mirror with outer reflecting chromic layer.
EFFECT: enhanced precision.
3 dwg
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