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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Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Commonly used light sources include incandescent lamps, either operated without? If the document is revised or amended, you will be notified by email. Summary of Practice 4.
The angles at which these readings occur should be noted in reference to the orientation of the specimen. When all regularly that is, specularly re? The requirements for illuminating and viewing may be interchanged. As the voice of the U. A still better method for characterizing?
Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Last previous edition approved in as E — The values and procedures for computing CIE tristimulus values from spectrometric data are contained in Practice E Other standards calibrated to the perfect re? Special considerations for the interactions between an 5 instrument geometry and the specimen surface are cited in the following sections and will also apply to the formulation of product colors.
ast On this scale, the smallest color difference that can be reliably observed is of the order of 0. It is essential that these portions impinge on areas of the sphere wall having the same re? When the specimens do not have these desired characteristics, departures should be noted. Some modern, high brightness, retrore? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Dust, dirt and even? The geometric arrangement of the viewing beam may be the same as that of the illuminating beam, or may differ, for example, by the use of a hemispherical receiver such as an integrating sphere.
Use of shorter wavelength ranges may result in reduced accuracy. Tt and the measurement provides the total transmittance factor Tt. Details of the size, shape, and re? This practice is general as to the materials to be characterized for color. Need more than one copy? Precision and Bias Standards Subsctiption may be the perfect solution. See Practice E Whenever the cavity is employed it should always be presented to the instrument in the indicated orientation.
Considerations regarding the selection of appropriate illuminating and viewing geometries are contained in Guide E When the specimen does not exhibit directionality, any of the bi-directional geometries may be used. Subscription pricing is determined by: This step does not apply to spectrocolorimeters. If the spectral interval and bandpass are greater than 1 nm then it is recommended that the spectral data be interpolated and then deconvolved 21 down to the 1 nm interval before computing tristimulus values as recommended in Practice E The results of diffuse measurements made on specimens having broad regular-transmittance factor peaks will depend importantly on the size of the re?
Each user must decide whether the loss of accuracy in his measurements is negligibly small for the purpose for which data are obtained. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. See also Guide E and Practice E The preferred geometry will be the one that minimizes the surface effects, thereby optimizing the separation.
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The CIE recommends that this ideal standard of re? Special precautions, outlined here, must be observed to minimize the effects of these characteristics; the use of special equipment beyond the scope of this practice may be required to eliminate the effects entirely.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Geometric notations may be found in Practice E This asmt is general as to the materials to be characterized for color.
Td and the diffuse transmittance Td is obtained.
For example, the value of the re? The presence of surface contaminants will critically affect the reliability of this standard. Current edition approved June 1, Detailed descriptions of these geometries can be found in the appropriate sections of Practice E If a white re? Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
In such cases, verify the accuracy of the reading at the low end of the photometric scale by using a calibrated standard with re? NOTE 3—For certain applications of the When the specimen is placed in the transmission compartment as far away from the sphere port as possible, essentially regular transmittance factor is obtained.
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