2 edition of White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM"s 2015 and 2016) found in the catalog.
White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM"s 2015 and 2016)
Victor R. Weidner
by U.S. Dept. of Commerce, National Bureau of Standards in Washington, DC
Written in English
|Statement||Victor R. Weidner.|
|Series||NBS special publication ;, 260-82, Standard reference materials|
|Contributions||United States. National Bureau of Standards.|
|LC Classifications||QC100 .U57 no. 260-82, QC425 .U57 no. 260-82|
|The Physical Object|
|Pagination||xi, 21 p. :|
|Number of Pages||21|
|LC Control Number||83600516|
the illuminant, the reflectance or transmittance of the object, and the standard observer functions. The product is then summed for the wavelengths in the visible spectrum to give the resulting X, Y, Z tristimulus values. •• The. CIE Tristimulus color values X, Y, Z. of any color are obtained by multiplying together the data values for. diffuse reflectance spectroscopy ing per unit layer thickness of the medium. These so-called coefficients of absorption and scattering are generally taken to be properties of the irradiated layer, assumed to be a con- tinuum, and are experimentally accessible.
Furthermore, conventional BK-7 glass does not transmit in this band, so fused silica or calcium fluoride optics is required. Standard black-and-white film has plenty of UV response from about to nm. It must be used in conjunction with a barrier filter that blocks visible light . Diffuse Reflectance Coatings Spectraflect Reflectance Coating 2 ings and materials such as Opal Glass, Eastman , or GE Integrating Sphere Paint™, this guide will serve as a the visible region of the spectrum and drop off sharply in the blue end .
Title: Standard Reference Materials: White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM's and )/ Date Published: Authors: Victor R Weidner Report Number: NBS SP doi: / Download PDF | Download Citation.  A detailed study of the spectral properties of opal‐A from the Ohaaki Pool spring system has provided the following conclusions:  • “OH” exists as isolated and H‐bonded H 2 O molecules, and as isolated or H‐bonded silanol.  • Two classes of opal‐A spectra exist between 6–13 μm. The Class‐1 spectrum resembles.
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Get this from a library. White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM's and ). [Victor R Weidner; United States. National Bureau of Standards.]. An illustration of an open book. Books. An illustration of two cells of a film strip.
Video An illustration of an audio speaker. White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM's and )" See other formats. An illustration of an open book. Books. An illustration of two cells of a film strip. Video An illustration of an audio speaker. Standard Reference Materials: White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM's and ).
Vitrolite white opal glass was calibrated for use as diffuse spectral reflectance standards since Its uniformity and long-term durability make it useful as an everyday working standard for spectrophotometric measurements in the visible spectral range.
However, its translucency can introduce some errors in such measurements if improperly by: 4. Accurate measurements of diffuse reflectance in the visible spectral region, from nm to nm, are For a white reflectance standard that is used for color and BCR opal glass standards. Weidner V R White opal glass diffuse spectral reflectance standards for the visible spectrum (SRM's and ) NBS Special Publication Clarke F J J, Garforth F A and Parry D J Goniophotometric and polarization properties of white reflection standard.
All Spectralon materials are optically flat to +/- 4% over the range of – nm and +/- 1% over the photopic region of the spectrum. Spectralon Diffuse Reflectance Standards are highly Lambertian, with Spectralon SRM reflectance material being the most Lambertian reflector available for use over the wavelength range from – nm.
Accurate measurements of diffuse reflectance in the visible spectral region, from nm to nm, are required for the determination of material optical properties, such as the color and. A study on the variation of the spectral bidirectional reflectance distribution function (BRDF) of four diffuse reflectance standards (matte ceramic, BaSO4, Spectralon, and white Russian opal glass) is accomplished through this work.
Spectral BRDF measurements were carried out and, using principal. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
Electromagnetic radiation in this range of wavelengths is called visible light or simply light.A typical human eye will respond to wavelengths from about to nanometers. In terms of frequency, this corresponds to a band in the vicinity of – THz. Among these were diffuse reflectance standards and targets in white, gray-scale and color, as well as fluorescence standards and wavelength calibration standards.
An out-growth of this business was the inclusion of Infragold® standards for infrared applications, as well as specular reflectance standards for calibrating instruments measuring. Spectral reflectance signatures result from the presence or absence, as well as the position and shape of specific absorption features, of the surface.
Examples of spectral signatures for soils, litter, and vegetation are shown in Figure In the case of vegetation, light absorption by leaf pigments dominates the reflectance spectrum in the visible region (– nm). # - White Reflectance Standard (Includes 99% Standard) Suitable for Spectroscopy, Colorimetry, Radiometry, and Machine Vision Applications Diffuse Reflectance.
Standard ground glass and white diffusing glass will produce diffuse illumination, but the diffuse light area will often exceed the requirements of the system. This over-illumination, associated with traditional diffusers, reduces efficiency and can often lead to added costs by requiring higher power illumination sources, lenses, and possibly.
Weidner, V.R. (): White Opal Glass Diffuse Spectral Reflectance Standards for the Visible Spectrum (SRM's and ), NBS Special Publication21 pp.
Google Scholar Weidner, V.R. and Hsia, J.J. (): Reflectance Properties of Pressed Polytetrafluoroethylene Powder, J Opt Soc Am - Robert T. Marcus, in AZimuth, Spectrophotometers.
In addition to the illuminant and the standard observer’s color matching functions, the spectral reflectance of the object is needed to calculate tristimulus values.A spectrophotometer measures the reflection (or transmission) characteristics of an object at different wavelengths of the visible spectrum.
The obtained value becomes the reflectance (relative reflectance) with respect to the reflectance of the reference standard white board, which is taken to be %. When light is directed at the sample at an angle of 0°, specular reflected light exits the integrating sphere and is not detected.
As a result, only diffuse reflected light is measured. The NIST Spectral Tri-function Automated Reference Reflectometer is described in Part III. This instrument provides the basis for the development of absolute NIST standards of diffuse and specular reflectance standards.
Spectralon ® – Diffuse Reflectance Standards. Nearly ideal lambertian, diffuse reflectance from 2 % to 99 %; Spectralon materials are optically flat to +/- 4% over the range of – nm and +/- 1% over the photopic region of the spectrum.
Diffuse Reflectance Spectroscopy reference „white standard“ Catalyst Light Source Detector spectrum: reflectance of sample (catalyst) vs.
reflectance of standard ¾Need element that collects diffusely reflected light ¾Need to avoid specularly reflected light ¾Need reference standard (white standard). Weidner, V.R. (): White Opal Glass Diffuse Spectral Reflectance Standards for the Visible Spectrum (SRM's and ), NBS Special Publicationp.
Google Scholar.spectral diffuse reﬂectance standards were studied in the near-UV to visible region. Spectroscopic analysis based on a two-monochromator method revealed that most of white reference materials produced photoluminescence upon exposure not only to near-UV and UV radiation but also to visible radiation shorter than nm.
Remarkable differences.Color (American English), or colour (Commonwealth English), is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or perception of color derives from the stimulation of photoreceptor cells (in particular cone cells in the human eye and other vertebrate eyes) by electromagnetic radiation (in the visible.