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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 geometric arrangement of the viewing beam may be asgm 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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The spectrometer may be either a typical colorimetric spectrometer, designed speci? You may delete a document from your Alert Profile at any time. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. NOTE 5—When a hemispherical receiver such aastm an integrating sphere is used, and the specimen is placed? When information on directionality is not required, the several measurements may be averaged.

Geometric notations may be found in Practice 1e164 This standard is also available to be included in Standards Subscriptions.


Dust, dirt and even? If the spectral interval and bandpass are greater than 1 nm then it e164 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 E — 09a 7. No other units of measurement are included in this standard.

The following paragraphs incorporate such a statement. It is essential that these portions impinge on areas of the sphere wall having the same re? Aztm preferred geometry will be the one that minimizes the surface effects, thereby optimizing the separation. Standardization and Material Standards Considerations regarding the selection of appropriate illuminating and viewing geometries are contained in Guide E While this method works?

ASTM E – Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation

Other standards qstm to the perfect re? A number in parentheses indicates the year of last reapproval. Td and the diffuse transmittance Td is obtained. 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?

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Use of shorter wavelength ranges may result in reduced accuracy. Please first log in with a verified email before subscribing to alerts. We have no amendments or corrections for this standard. The detector may be a photoelectric astmm phototube or photomultipliera silicon photodiode or diode array, or another suitable photodetector.


Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation

When the degree of directionality of the specimen is to be evaluated, uniplanar geometry should be used. When the specimens do not have these desired characteristics, departures asm be noted. Ee1164 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.

Current edition approved June 1, Use of most geometries will not allow complete separation of the surface effects from the color. Examples of suitable veri? When the specimen is placed in the transmission compartment as far away from the sphere port as possible, essentially regular transmittance factor is obtained. Care should be taken not to touch the area to be measured except for application of a suitable cleaning procedure. The values and procedures for computing CIE tristimulus values from spectrometric data are contained in Practice E However, for the measurement of?