ASTM E2153-01(2011)

ASTM E2153-01(2011) - 1.11.2011

Significance and Use

The bispectral or two-monochromator method is the definitive method for the determination of the general (illuminant-independent) radiation-transfer properties of fluorescent specimens (2). The Donaldson radiance factor is an instrument- and illuminant-independent photometric property of the specimen, and can be used to calculate its color for any desired illuminant and observer. The advantage of this method is that it provides a comprehensive characterization of the specimen's radiation-transfer properties, without the inaccuracies associated with source simulation and various methods of approximation.

This practice provides a procedure for selecting the operating parameters of bispectrometers used for providing data of the desired precision. It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.

1. Scope

1.1 This practice addresses the instrumental measurement requirements, calibration procedures, and material standards needed for obtaining precise bispectral photometric data for computing the colors of fluorescent specimens.

1.2 This practice lists the parameters that must be specified when bispectral photometric measurements are required in specific methods, practices, or specifications.

1.3 This practice applies specifically to bispectrometers, which produce photometrically quantitative bispectral data as output, useful for the characterization of appearance, as opposed to spectrofluorimeters, which produce instrument-dependent bispectral photometric data as output, useful for the purpose of chemical analysis.

1.4 The scope of this practice is limited to the discussion of object-color measurement under reflection geometries; it does not include provisions for the analogous characterization of specimens under transmission geometries.

This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

NBS No. 260-66	Didymium Glass Filters for Calibrating the Wavelength Scale of Spectrophotometers Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
E958-13(2021)	Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
E925-09(2022)	Standard Practice for Monitoring the Calibration of Ultraviolet-Visible Spectrophotometers whose Spectral Bandwidth does not Exceed 2 nm
E1164-23	Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
CIE Report of TC-2.25:	Calibration Methods and Photoluminescent Standards for Total Radiance Factor Measurement
E179-17(2022)	Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
E2152-12(2023)	Standard Practice for Computing the Colors of Fluorescent Objects from Bispectral Photometric Data
E1341-16(2020)	Standard Practice for Obtaining Spectroradiometric Data from Radiant Sources for Colorimetry
E284-22	Standard Terminology of Appearance
NPL Report MOM 12	Problems of spectrofluorimetric standards for reflection and colorimetric use Available from National Physical Laboratory, Queens Road, Teddington, Middlesex, United Kingdom TW11 0LW, http://www.npl.co.uk/.