Find the most up-to-date version of ASTM E at Engineering ASTM E() E1 Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation [ASTM International] on *FREE*. ASTM E Standard Practice for Obtaining Spectrometric Data for Object- Color Evaluation. This practice covers the instrumental measurement.
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When the degree of directionality of the specimen is to be evaluated, uniplanar geometry should be used. Geometric notations may be found in Practice E Some national laboratories will accept user supplied white material standards and supply a calibration of the re?
Care must be taken to correct for this error 3, Test Method D 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. The spectrometer may be either a typical colorimetric spectrometer, designed speci? Ast can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
If the instrument requires calibration with a Grey tile to evaluate the single-beam integrating-sphere photometric nonlinearity, the linearity veri?
Add to Alert PDF. Considerations required when measuring? The same method should be used to verify the zero reading in instruments that do not require such a calibration step. Standards Subsctiption may be the perfect solution. Use of a wider interval, such as 10 nm or 20 nm, will result in a signi? If the black-cavity traps light by utilizing asymmetric or off-axis black optics then a preferred orientation of the cavity relative to the optical axis should be identi?
It exceeds unity if the system is such that the specimen causes more light to reach the receiver than would in its absence.
Detailed descriptions of these geometries can be found in the appropriate sections of Practice E Exceptions to this applicability are noted. Some modern, high brightness, retrore? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Care should be taken not to touch the area to be measured e116 for application of a suitable cleaning procedure.
Subscription pricing is determined by: Colorimetric data are obtained by combining object spectral data with data representing a Asgm standard observer and a CIE standard illuminant, as described in Practice E Last previous edition approved in as E — Your comments are invited either for revision of this standard or for asrm standards and should be addressed to ASTM International Headquarters.
This practice is general as to the materials to be characterized for color. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The CIE recommends that this ideal standard of re?
ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Examples of suitable veri? Keeping the surface clean is essential as errors in apparent re? Whenever the cavity is employed it should always be presented to the instrument in the indicated orientation.
More recently, discrete pseudo-monochromatic sources, such as light emitting diodes LED have also been used as sources in colorimetric spectrometers. Use of shorter wavelength ranges may result in reduced accuracy.
No other units of measurement are included in this standard. For example, the value of the re? NOTE 5—When a hemispherical receiver such as an integrating sphere is used, and the specimen is placed? The angles at which these readings occur should be noted in reference to the orientation of the specimen. You may delete a document from your Alert Profile at any time. In other cases, use may be made of another white material, with assigned re?
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Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
NOTE 1—Accuracy is here de? The presence of surface contaminants will critically affect the reliability of this standard. Your Alert Profile lists the documents that will be monitored.
See also Guide E and Practice E When the regularly transmitted beam is excluded, for example by the use of a light trap, the condition is aastm 0: