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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In order to avoid implying unnecessary restrictions on instrumentation that can be used, when referencing this practice one should except s1164 those cases of?
Standardization and Material Standards Exceptions to this awtm are noted. The spectrometer may be either a typical colorimetric spectrometer, designed speci? Considerations regarding the selection of appropriate illuminating and viewing geometries are contained in Guide E For transmittance measurement, the reading obtained in the absence of a specimen is regularly assigned the value It also provides for instrument calibration by means of material standards, and for selection of suitable specimens for obtaining precision in the measurements.
In general, spectral re? The information reported here re? See Practice E When information on directionality is not required, the several measurements may be averaged. 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, If the black-cavity traps light by utilizing asymmetric or off-axis astj optics then a preferred orientation of the cavity relative to the optical axis should be identi?
Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Geometric notations may d1164 found in Practice E Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. This standard is not included in e11164 packages. Current edition approved June 1, Each user must decide whether the loss of accuracy in adtm measurements is negligibly small for the purpose for which data are obtained.
This standard is also available to be included in Standards Subscriptions. If the instrument requires calibration with a Grey tile to evaluate the single-beam integrating-sphere photometric nonlinearity, the linearity veri? Last previous edition approved in as E — Examples of suitable veri? The preferred geometry will be the one that minimizes the surface effects, thereby optimizing the separation.
The use of pseudomonochromatic sources is not currently recommended by Subcommittee E It is highly recommended that instrumental readings be corrected for? E — 09a aetm. 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 The same restriction applies to the viewing beam.
ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation
NOTE 3—For certain applications of the Summary of Practice 4. Originally e1146 in This practice is general as to the astk to be characterized for color. Details of the size, shape, and re? However, for the measurement of? Requirements When Using Spectrometry 6. Proceed to Checkout Continue Shopping. The condition of the specimens before and after measurement should be noted and reported.
Errors in the apparent re? The values and procedures for computing CIE tristimulus values from spectrometric data are contained in Practice E Use of a wider interval, such as 10 nm or 20 nm, will result in a signi?
Use of most geometries will not allow complete separation astn the surface effects from the color. In other cases, use may be made of another white material, with assigned re?
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No other units of measurement are included in this standard. The results of diffuse measurements made on specimens having broad regular-transmittance factor peaks will depend importantly on the size of the re? This practice is general as satm the materials to be characterized for color. 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.
However, the use of a wider interval can lead to signi? Some national laboratories will accept user supplied white material standards and supply a calibration of the re? It exceeds unity if the system is such that the specimen causes more light to reach the receiver than would in its absence.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
As the voice of the U. 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 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.
Detailed descriptions of these geometries can be found in the appropriate sections of Practice E