2 edition of Preparation and calibration of standards of spectral specular reflectance found in the catalog.
Preparation and calibration of standards of spectral specular reflectance
J. C. Richmond
Written in English
|Statement||by J.C. Richmond and J.J. Hsia.|
|Series||National Bureau of Standards special publication 260-38|
|Contributions||Hsia, J. J., National Bureau of Standards.|
Specular reflection, also known as regular reflection, is the mirror-like reflection of waves, such as light, from a this process, each incident ray is reflected at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by incident and reflected rays. The result is that an image reflected by the surface is. reference standards. Standards for the calibration of reflectance scale for the infrared region are not available. The present work describes the development of a specular reflectance standard at glancing angles of incidence from 10" to 70" for the 2,5 pm to 25 pm infrared region. Whereas aluminium and gold mirrors have been used.
an 80 angle at the reflectance port. The spectra are traceable to interna-tional standards such as CIE, ASTM, ANSI, DIN and EN. • Distinction between specular and diffuse reflectance Samples with different gloss characteristics or varying surface polishing can be analyzed in specular and diffuse reflectance mode. A standard gloss trap in theFile Size: KB. Knowing the specular reflectance properties of materials is critical in applications of optical coatings, mirrors, luminaires, automotive lamp housings, and building materials. The OL system is extremely versatile. It is designed to be easily reconfigured by the user to accommodate different sample setups at fixed angles or with an automated goniometer.
The use of Reflectance Spectroscopy can used as a quantitative and qualitative ¥ality control Specular Reflectance nforrnaton, Smoothness ard flatness of the part If the part has been corroded it will scarer light 50 the of diffuse reflectance compared to may on of plated surface, and Reflectance in a Sample - . This standard practice describes the calibration of standards for hemispherical reflectance in relation to the theoretically perfect reflecting diffuser with an assigned value of unity. The calibration of an instrument standard is made by means of a standard coated flat plate.
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Preparation and calibration of standards of spectral specular reflectance. [Washington] National Bureau of Standards; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.
Preparation and calibration of standards of spectral specular reflectance. By Joseph C. Richmond, J. Hsia and Institute for Basic Standards (U.S.) Abstract "CODEN: XNBSAV."Includes bibliographical of access: Internet Specular reflectance.
Reference standards provide up to 98% reflectance for characterization of optical surfaces from to nm DUNEDIN, FL — — Ocean Optics announces two new extremes in specular reflectance standards.
The STAN-SSH High-reflectivity Specular Reflectance Standard is a mirrored fused-silica optical standard for use as a. For reflectance standards having approxi- mately nonselective spectral reflectance distributions the luminous reflectance is very close or equal to the spectral reflectance at nm.
Consequently, if in the following tables only a value in the nm column appears, the original value is a luminous reflectance. The Specular Reflectance Standard is a unique material for calibration of your reflectance measurement system.
The standard is a specially treated germanium element which only allows reflection from its front surface – thereby providing a reflection value which can be calculated relative to Fresnel equations.
Diffuse and Specular reflectance techniques such a spectral measurement is representative of the transmission technique for the coating thickness as the light radiation travels through the sample coating layer, rather than a specular reflection measurement per se from the front surface. Typical applications include the study of surface.
Reflectance spectroscopy is the investigation of the spectral composi tion of surface-reflected radiation with respect to its angularly dependent intensity and the composition of the incident primary radiation.
Two limiting cases are important: The first concerns regular (specular) reflection fromBrand: Springer-Verlag Berlin Heidelberg. The STAN-SSH High-reflectivity Specular Reflectance Standard is a mirrored, fused-silica standard that can be used as a reference when measuring surfaces with high specular reflectance values such as optical substrates, optical coatings, machined metals and semiconductor materials.
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 highly specular materials.
Short Description. Labsphere diffuse reflectance standards are made out of Spectralon, a high reflective, PTFE-based material that is resistant to heat, humidity and exposure to high levels of radiation, making them ideal for usage as optical standards.
Standards are available calibrated over two spectral ranges: nm or nm; with the calibration angle at near-normal geometry (8°). The reflectance at this angle is quite flat, in the order of 5. Labsphere Spectralon® Wavelength Calibration Standards are formulated by impregnating a Spectralon substrate with the oxide of a rare earth element which displays sharp absorption spikes at specific wavelengths.
Complete absorption spectral data is supplied with each standard. The three standards available are Holmium Oxide for the UV-VIS-NIR calibrations, Dysprosium Oxide for NIR calibrations and Erbium Oxide – for VIS-NIR calibrations. New Product: Low Reflectance Specular Standards.
The standard is available calibrated over two spectral ranges ( nm or nm), with the calibration angle at near-normal geometry (8°). The reflectance at this angle is quite flat, in the order of %R.
Preparation and Calibration of First Surface Aluminum Mirror Specular Reflectance Standards (SRM a) (May ). Weidner, V.
R., and Hsia, J. Preparation and Characterization of K and K Mineral Glasses for Microanalysis: SRM (April ).
Marinenko, R. Spectralon Reflectance Standards. Spectralon white and greyscale standards provide diffuse reflectance from 2 to 99% and are used to calibrate spectrophotometers, BRDF scatterometers, spectroradiometers and reflectometers in the nm range. This instrument provides the basis for the development of absolute NIST standards of diffuse and specular reflectance standards.
The transfer instruments rely on master standards that are periodically calibrated on the high accuracy reference reflectometer described in Part III. References containing details are reproduced in the appendices. In this paper, we introduce a flexible and simple system calibration method for specular surface metrology based on the combination of reflection rays determined by the varied points on a screen and reflection images of a plane mirror without fiducials placed at three different locations.
This calibration procedure involves three steps. The camera is first calibrated based on plane by: 6. Reference Standards – For Calibrating FTIR Spectrometers FTIR spectrometers are highly accurate and reliable measurement tools. Their internal referencing laser (Connes advantage) is a great leap forward in wavenumber accuracy and repeatability.
Still, it is often required. Peter A. van Nijnatten, in Experimental Methods in the Physical Sciences, Measuring Specular Reflectance with an FTIR. Spectral reflectance measurements in the infrared are widely used in determining the emissivity of coated glazing to establish the energy-saving capability of the coating.
Traditionally, these measurements where made using a dispersive (grating) spectrophotometer. SWIR CALIBRATION OF SPECTR ALON REFLECTANCE FACTOR Georgi T. Georgiev a, James J.
Butler b, Catherine Cooksey c, Leibo Ding, Kurtis J. Thome b aSigma Space Corp., Lanha m, MDe-mail: [email protected] bNASA Goddard Space Flight Ce nter, Greenbelt, MD cNational Institute of Standards and Technology, Gaithersburg, MD File Size: 4MB. Get this from a library! Preparation and calibration of first-surface aluminum mirror specular reflectance standards.
[Victor R Weidner; J J Hsia; Center for .These two standards are nearly identical in spectral reflectance and are still in use after forty years.
Standard V1-G3 has been used as a diffuse reflectance calibration standard in the making of thousands of reflectance measurements during this period while Standard V1-G4 has been stored.Reflection measurement using a fiber optic probe at 45 degrees – Spectrecology % Reflection or reflectance is measured as the ratio of light reflected from a sample to light reflected from a reference material.
When measuring specular reflectance, it is usually expressed in a percentage scale (%R).