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 information on directionality is not required, the several measurements may be averaged. Already Subscribed to this document. In such cases, verify the accuracy of the reading at the low end of the photometric scale by using a calibrated standard with re? It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.
The requirements for illuminating and viewing may be interchanged. Exceptions to this applicability are noted. Precision and Bias Use of shorter wavelength ranges may result in reduced accuracy. No other units of measurement are included in this standard. Need more than one copy? NOTE 5—When a hemispherical receiver such as an integrating sphere is used, and the specimen is placed?
The instrument user must assume the responsibility for obtaining the necessary material standards. While this method works?
Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Standardization and Material Standards However, the use of a wider interval can lead to signi? In such cases, f1164 is recommended 5 to use the substitution method of measurement rather than the comparison method 3. The detector may be a photoelectric device phototube or photomultipliera silicon photodiode or diode array, or another suitable photodetector.
Last previous edition approved in as E — Other standards calibrated to the perfect re? Current edition approved June 1, Detailed descriptions of these geometries can be found in the appropriate sections of Practice E The information reported here re? The detector must be stable with time and have adequate responsivity over the wavelength range used.
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On this scale, the smallest color difference that can be reliably observed is of the order of 0. See asstm Guide E and Practice E When the regularly transmitted beam is excluded, for example by the use of a light trap, the condition is designated 0: Some national laboratories will accept user supplied white material standards and supply a calibration of the re? The spectrometer may be either a typical colorimetric spectrometer, designed speci? The preferred geometry will be the one that minimizes the surface effects, thereby optimizing the separation.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The values and procedures for computing CIE tristimulus values from spectrometric data are e1614 in Practice E This standard is not included in any packages.
E — 09a 7. Considerations regarding the selection of appropriate illuminating and viewing geometries are contained in Guide E NOTE 6—For all the conditions described in 8. In these cases, it may be more appropriate to use larger cone angles, with appropriate tolerances. No other units of measurement are included in this standard.
ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
However, for the measurement of? Use of most geometries will not allow complete separation of the surface effects from the color. When the specimen does not exhibit directionality, any of the bi-directional geometries may be used.
Inter-instrument agreement comparing different types of instruments, especially if different geometric parameters of the illuminating and viewing conditions are involved, is likely to be an order of magnitude poorer 23, A still ee1164 method for characterizing?
Exceptions to this applicability are noted.
Whenever the cavity is employed it should always be presented to the instrument in the indicated orientation. Errors in the apparent re?
It is essential that these portions impinge on areas of the sphere wall having the same re? Keeping the surface clean is essential as errors in apparent re? Add to Alert PDF. Some modern, high brightness, retrore? The angles at which these readings occur should be noted d1164 reference to the orientation of the specimen.
Blocking should be carried out by replacing the specimen with an opaque object of the same ast, and shape as the specimen, placed in the same position.