MaTestLab > Test Standards > ASTM E1477 Test Method for Luminous Reﬂectance Factor of Acoustical Materials by Integrating-Sphere Reﬂectometers

ASTM E1477 Test Method for Luminous Reﬂectance Factor of Acoustical Materials by Integrating-Sphere Reﬂectometers

ASTM E1477 test method is used to determine the luminous reflectance factor of acoustical materials in order to estimate the levels of room illumination. Specimens are tested using a spectrophotometer, a tristimulus colorimeter, and another reflectometer with a hemispherical optical measuring instrument, like an integrating sphere.

Introduction to ASTM E1477

ASTM E1477 standard color measurement methods are used to determine the (total) luminous reflectance factor of test specimens using a spectrophotometer, a tristimulus colorimeter, and another reflectometer with a hemispherical optical measuring instrument, like an integrating sphere. The specular component is incorporated, which provides the total reflectance factor condition.

ASTM E1477 Test Method

ASTM E1477 describes the procedure to calculate an acoustical material’s luminous reflectance factor. It applies to products with a surface that is rough or porous and is primarily made for sound absorption.

Procedure for measurement of parameters	Most reflectometers calculate the luminous reflectance factor automatically. For the 1964 (10°) standard observer and standard illuminant D 65 or F 2, choose the proper parameters to produce CIE Y. Use the reflectometer’s greatest available viewing or lighting area. Measure at least three test specimens chosen at random from the panels that make up each sample.
Additional Measurements	To satisfy the approximate tolerance of 0.1 unit of Y, additional test specimens or repeated measurements of each test specimen may occasionally be required.

ASTM E1477 Specimens

Specimen details	ASTM E1477 specimens are acoustical materials. Acoustical materials can be found in a variety of configurations, including tiles, panels, sheets, and others.
Specimen dimensions	The general sample size for ASTM E1477 varies depending on the specimen holder of the integrating-sphere reflectometer.
Specimen preparation	Specimens are acoustical materials, and for accurate and reliable findings, the test specimens are placed in the integrating-sphere reflectometer’s specimen holder in the proper orientation.

ASTM E1477 Results

ASTM E1477 outlines the process for calculating the luminous reflectance factor of acoustical materials. The CIE tristimulus value Y for the CIE 1964 (10°) standard observer and the CIE standard illuminant D 65 (daylight) or F 2 (cool white fluorescent) are used to compute the luminance reflectance factor.

Tests Related to ASTM E1477

ASTM E1477 is related to standards such as ASTM E1331 for reﬂectance factor and color testing by spectrophotometry and ASTM E1345 for reducing the effect of variability of color measurement by use of multiple measurements.

FAQ's

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The turnaround time for astm e1477 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

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