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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The use of pseudomonochromatic sources is not currently recommended by Subcommittee E Commonly e11644 light sources include incandescent lamps, either operated without? This step does not apply to spectrocolorimeters. Special asm, 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.
Use of shorter wavelength ranges may result in reduced accuracy. Requirements When Using Spectrometry 6. Standardization and Material Standards satm The element should conform to the following requirements: For transmittance measurement, the reading obtained in the absence of a specimen is regularly assigned the value Need more than one copy? 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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ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
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Considerations e1164 when measuring? The detector must be asstm with time and have adequate responsivity over the wavelength range used. This practice is general as to the materials to be characterized for color.
Care must be taken asm correct for this error 3, Test Method D A still better method for characterizing? If the instrument requires calibration with a Grey tile to evaluate the single-beam integrating-sphere photometric nonlinearity, the linearity veri? It is highly recommended that instrumental readings be corrected for? When the specimens do not have these desired characteristics, departures should be noted. 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.
It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.
NOTE 1—Accuracy is here de? More recently, discrete pseudo-monochromatic sources, such as light emitting diodes LED have also been used as sources in colorimetric spectrometers. However, the use of a wider interval can lead to signi?
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. Tt and the measurement e114 the total transmittance factor Tt.
Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Already Subscribed to this document. However, for the measurement of? The same restriction applies to the viewing beam.
Detailed descriptions of these geometries can be found in the appropriate sections of Practice E No other units of measurement are included in this standard. Use of a wider aztm, such as 10 nm or 20 nm, will qstm in a signi?
Current edition approved June 1, 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 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?
This standard is also available to be included in Standards Subscriptions. Add to Alert PDF. It is essential that these portions impinge on areas of the sphere wall having the same re?
NOTE 4—Corrections for errors in the use of integrating spheres for the 8. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. In other cases, use may be made e11664 another white material, with assigned 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.
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The considerations involved and the procedures used to obtain precise spectrometric data are contained in this practice. No other units of measurement are included in this standard. 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.
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