Solutions for Optical Spectroscopy Materials, Coatings, & Standards

Gray Scale Standards

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Contact Art Springsteen: Email or (603)526-2420


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Contact Kathy Springsteen: Email or (603)526-2420


greyscalestds

Hemispherical reflectance

Gray scale standards are essential for establishing the photometric linearity of a reflectance spectrometer. These are used in the same way neutral density filters are used in transmittance instruments. Avian Technologies FluorilonTM Gray Scale standards allow the user to calibrate an instrument over a 2 decade range of reflectance, which is well over the typical range seen by a reflectance instrument. The materials are highly diffuse and therefore have little angular dependence and almost no gloss, which means that specular included and excluded geometries should show little difference in reflectance values.

The standards set consists of four standards of nominal reflectance (at 600 nm) of 2%, 10%, 50%, and 99% reflectance. The standards are mounted in a Delrin holder with cap. The set is presented in a waterproof plastic box.


Part #

Description

FSS-04-01C 1.25" Fluorilon Gray Scale Reflectance Standard Set
Calibrated, Traceable to NIST/NRC, Boxed
FSS-04-02C 2.0" Fluorilon Gray Scale Reflectance Standard Set
Calibrated, Traceable to NIST/NRC, Boxed
FSS-08-01C 1.25" Fluorilon Expanded Gray Scale Set of 8 stds.
Nominal Reflectances: 2%, 5%, 10%, 20%, 40%, 60%, 80%, 99%)
All have tolerances of ±2% at 600 nm except the 2%, and 99%, which have ±1%.
FSS-08-02C 2.0" Fluorilon Expanded Gray Scale Set of 8 stds.
Nominal Reflectances: 2%, 5%, 10%, 20%, 40%, 60%, 80%, 99%)
All have tolerances of ±2% at 600 nm except the 2%, and 99%, which have ±1%.

Individual Standards
FGS-XX-01C 1.25" Fluorilon Gray Standard, Calibrated traceable
to NIST/NRC, (xx designates nominal reflectance at 600nm)
FGS-XX-02C 2.0" Fluorilon Gray Standard, Calibrated traceable
to NIST/NRC, (xx designates nominal reflectance at 600nm)

Gray scale standards are available uncalibrated or calibrated 8:d and/or 45:0.
 

‘Encapsulated’ Gray Scale and Wavelength Standards to meet USP 1119

Avian Technologies is introducing new ‘encapsulated’ gray scale and wavelength standards to meet USP 1119. The standards are identical to the Fluorilon FSS-08-02c kit except the Fluorilon is encased in a Delrin™ holder with a 2” diameter BK-7 window. The overall size of the standard is 2.400” diameter (61 mm) and 0.620” thick (15.88 mm). The size of both the gray scale and wavelength standards is identical to enable fixturing for most instruments designed to measure pharmaceutical on-line processes.

The wavelength standard has the same components as the National Institute of Technology’s SRM-1920a, with a small amount of an inert, spectrally non-absorbing binder. Unlike sintered equivalents of SRM-1920a, this standard exhibits no peak shifting and is both durable and stable.

Both gray scale and wavelength standard have a small, re-sealable port in the top to allow for conditioning of the standard in a controlled humidity environment.

Part #

Description

EN-FSS-04-02c Set of four gray scale standards, cells with BK-7 window, nominal 8°/hemispherical reflectance of 2%, 10%, 40%, and 99%, calibrated from 400-2400 nm, traceable to NIST/NRC.
EN-FSS-08-02c Set of eight gray scale standards, cells with BK-7 window, nominal 8°/hemispherical reflectance of 2%, 5%, 10%, 20%, 40%, 60%, 80%, and 99%, calibrated from 400-2400 nm, traceable to NIST/NRC.

EN-FSS-08-02c kit comes in a waterproof plastic box to hold eight standards. EWC-P1920a-02c comes in an individual wooden box.
 

BCRA Gray Scale Tile Set

ceramgreyscale

ceramgrey Hemispherical reflectance
In some cases, especially where durability and frequent cleaning are necessary or organic fumes or grease are present, ceramic tile standards provide a better choice than Fluorilon standards. In addition, these standards are more suited to small spot measurements or at 0:45 geometry, where the specular component is automatically excluded.

The standard set consists of ten standards (white, 80%, 70%, 60%, 50%, 33%, 8%, 4.5% black, and a black glass) in Delrin holders with a 1" mounting counter bore in the back of the standard. The standards are presented in a water proof box. Note all reflectance percentages are nominal.

Representative measured data, along with D65/2° CIELAB and x, y, Y values can be downloaded from this spreadsheet (these are bidirectional radiance factor).

BCRA gray scale tiles are available in several options:
  • Matte or glossy finish
  • 2" square or 4" square
  • calibrated or uncalibrated (8:d, 8:T, 45:0 or any combination)

Custom sets are available. Customers often want individual white or black tiles, available as part#BCRA-WT-02 or BCRA-BK-02C.