ASTM E1331 Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry
ASTM E1331 explains the use of a spectrophotometer or spectrocolorimeter with a hemispherical optical measuring apparatus, such as an integrating sphere, to detect the reflection characteristics and color of object-color specimens. The values stated in SI units are considered as standard.
Scope:
This ASTM E1331 test method outlines processes for performing measurements utilizing a hemispherical optical measuring device and reflectance spectrophotometry. This test method is particularly well suited to the measurement of all types of object-color specimens to obtain data for use in computer colorant formulation and color assessment.
Procedure:
For the ASTM E1331 test, color scales were selected, observed, and illuminated for the computation of color coordinates, as well as the inclusion or absence of the specular component of reflection. The specimen is placed against the integrating sphere’s reflectance measuring port, using supporting material. Following the manufacturer’s instructions, the specimen is measured.
Specimen size:
Translucent specimens with two essentially plane and parallel surfaces and standard thickness and opaque specimens with at least one plane surface are used for ASTM E1331.
Read More :- ASTM E1348 Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
Data:
Calculations are automatically generated by the instrument.
Conclusion:
Using a spectrophotometer or spectrocolorimeter equipped with a hemispherical optical measuring equipment such as an integrating sphere, this ASTM E1331 test method provides a procedure for determining the reflectance factors of reflecting object-color specimens.
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