ASTM E903 PDF

A number in parentheses indicates the year of last reapproval. TestMethod E may be more appropriate to determine the bulkoptical properties of textured or inhomogeneous materials. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Additional terms appropriate to this test method areincluded in Terminology E Current edition approved Dec.

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A number in parentheses indicates the year of last reapproval. TestMethod E may be more appropriate to determine the bulkoptical properties of textured or inhomogeneous materials. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Additional terms appropriate to this test method areincluded in Terminology E Current edition approved Dec.

Published December Originallyapproved in Last previous edition approved in as E—96 which waswithdrawn August and reinstated in December DOI: Atlanta GA United States When referring to reflectance, it is the directional-hemispherical reflectance less the specular reflectance.

It consists of a cavity that is approxi-mately spherical in shape with apertures for admitting anddetecting flux and usually having additional apertures overwhich sample and reference specimens are placed. Free from inequalities or uneven-ness of surface. This use is deprecated in favor of the more preciseterm hemispherical. Having some degree of unevenness, roughness orprojections.

Summary of Test Method4. Significance and Use5. This test method provides a means for deter-mining these values under fixed conditions that represent anaverage that would be encountered during use of a system inthe temperate zone.

This test method also pro-vides a means for determining these values for extraterrestrialconditions. Materials that are textured, inhomogeneous, patterned, orcorrugated require special consideration. Measurements are typically made indoors usinglight sources other than natural sunlight, though it is possible toconfigure systems using natural sunlight as the illuminationsource, as in Practice E Practice E describes outdoormethods using natural sunlight over the spectral response rangeof the human eye.

For polarizing samples, measurement data will be afunction of the orientation of the sample. Polarization effectsmay be detected by measuring the sample with rotation atvarious angles about the normal to the samples. Double beam, ratio recording instruments are recommendedbecause of their low sensitivity to drift in source brightness oramplifier gain. Recording spectrophotometers with integratingspheres that have been found satisfactory for this purpose arecommercially available.

NOTE 1—For determining extraterrestrial solar optical properties usingStandard E, the spectral region should extend down to nm. NOTE 2—This test method is used primarily for solar thermal and somephotovoltaic applications that require the full spectral range be covered. There are other applications for which a narrower range is sufficient andthat could otherwise use the procedures of this test method.

For example,some applications involving photovoltaic cells utilize a narrower spectralresponsive range and some others pertain only to visible light propertiesthat have an even narrower spectral range. In such cases, the user of thetest method is permitted to use a narrower range. Similarly, a user with anapplication requiring a broader spectral range is permitted to use a broaderrange. Any deviations from the spectral range of this test method shouldbe noted in the report.

NOTE 3—The interior of the integrating sphere shall be finished with astable highly reflecting and diffusing coating. Sphere coatings having therequired properties can be prepared using pressed tetrafluoroethylenepolymer powder, or other highly reflective, stable material. NOTE 4—For high accuracy better than Ambient light must beprevented from entering the sphere by placing a ring of blackor white material around the external rim of the specimen portsor by covering the entire sphere attachment with a light tighthousing.

DIN 71751 PDF

NORMAS TÉCNICAS ASTM (PDF | MEGA | GRATIS | FULL)

Gubei Document Status Indicators The Green document status indicator indicates that the document is: Work Item s — proposed revisions of this standard. The Red document status indicator indicates that the document is an old version The document has likely been withdrawn by the publisher, also the meta data presented here may be out of date as it is no longer being maintained by the editorial teams at NBS. Specifies a test method for the measurement of spectral absorptance, reflectance, and transmittance of materials using spectrophotometers equipped with integrating spheres. ASTM E Standard test method for solar absorptance, reflectance, and transmittance of materials using integrating spheres. For polarizing samples, measurement data will 9e03 a function of the orientation of the sample. Historical Version s — view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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