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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ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Whenever the cavity is employed it should always be presented to the instrument in the indicated orientation. Care should be taken not to touch the area to be measured except for application of a suitable cleaning procedure.
The same method should be used to verify the zero reading in instruments that w1164 not require such a calibration step. NOTE 6—For all the conditions described in 8. NOTE 4—Corrections for errors in the use of integrating spheres for the 8.
Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
If adtm feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. If the spectral interval and bandpass are greater than ast 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 Other standards calibrated to the perfect re?
The CIE recommends that this ideal standard of re? Inter-instrument agreement comparing different astj of instruments, especially if different geometric parameters of the illuminating and viewing conditions are involved, is w1164 to asmt an order of magnitude poorer 23, NOTE 2—With the possible exception of the measurement of unusually structured or? E164 When Using Spectrometry 6.
See also Guide E and Practice E Detailed descriptions of these geometries can be found in the appropriate sections of Practice E The detector must be stable with time and have adequate responsivity over the wavelength range used. Use of most geometries will not allow complete separation of the surface effects from the color.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? When the specimens do not have these desired characteristics, departures should be noted. Add to Alert PDF. Td and the diffuse transmittance Td is obtained. For transmittance measurement, the reading obtained in the absence of a specimen is regularly assigned the value Care must also be taken to avoid discoloring of either area due to prolonged radiation or dirt, or partial translucency due to insufficient thickness of the coating.
Thus there is only one mode of measurement possible for the d: This standard is not included in any packages. No other units of measurement are included in this standard.
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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. Examples of suitable veri? Colorimetric data are obtained by combining object spectral data with data representing a CIE standard observer and a CIE standard illuminant, as described in Practice E See Practice E NOTE 3—For certain applications of the In order to avoid implying unnecessary restrictions on instrumentation that can be used, when referencing this practice one should except in those cases of?
Keeping the surface clean is essential as errors in apparent re? Considerations required when measuring? It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.
If the instrument requires calibration with a Grey tile to evaluate the single-beam integrating-sphere photometric nonlinearity, the linearity veri?
We have no amendments or corrections for this standard. Special precautions, outlined here, must be observed to minimize the effects of these asym the use of special equipment beyond the scope of this practice may be required to eliminate the effects entirely.
In other cases, use may be made of another white material, with assigned re?