Labsphere Spectralon® wavelength calibration standards provide stable absorption spectra for validating the wavelength calibration of spectrophotometers and spectrofluorometers in the UV-VIS-NIR region, from 250-2500nm. Each standard is formulated by doping Spectralon with one or more rare earth oxides that exhibit sharp absorption peaks at specific, known wavelengths. Complete absorption spectral data is supplied with each standard. A Holmium Oxide standard is available for UV-VIS-NIR calibrations, while a Dysprosium Oxide standard is offered for NIR calibrations. Meanwhile an Erbium Oxide standard is provided for VIS-NIR calibrations. Alternatively, a mixed oxide standard is available that is doped with all three rare earth oxides for use over the entire UV-VIS-NIR region.
Labsphere Spectralon® wavelength calibration standards provide stable absorption spectra for validating the wavelength calibration of spectrophotometers and spectrofluorimeters in the UV-VIS-NIR region, from 250-2500nm. Each standard is formulated by doping Spectralon with a rare earth oxide that exhibits sharp absorption peaks at specific wavelengths. Complete absorption spectral data is supplied with each standard.
A holmium oxide standard is available for UV-VIS-NIR calibrations, while a dysprosium oxide standard is offered for NIR calibrations. Meanwhile an erbium oxide standard is provided for VIS-NIR calibrations. Alternatively, a mixed oxide standard is available that is doped with all three rare earth oxides for use over the entire UV-VIS-NIR region.
Calibration
Calibration data for peak absorbance wavelengths and relative to maximum absorbance is provided with each standard. Calibration is traceable to the US National Institute of Standards and Technology (NIST).
Ordering Information
Order your Spectralon wavelength calibration standards either in sets of three individual rare earth oxides, or as a single multicomponent standard doped with all three rare earth oxides. Two sizes of standard are available, either 1.25 or 2.00 inch diameter. Each standard is housed in a durable Delrin holder with a protective, screw-on lid.
Wavelength Standard Sets – Calibrated
Individual Wavelength Standards – Calibrated
Parameter | Specification |
Available Models | WCS-HO: Holmium Oxide doped Spectralon |
Optical Surface | 1.25 inch or 2.00 inch (31.8 or 50.8mm) diameter |
Standard Type | Diffusely reflecting (Lambertian) |
Calibration Type | 8°/H (directional illumination with hemispherical collection), NIST traceable |
Parameters Reported | Spectral hemispherical reflectance factor, 250-25000nm |
Reporting Interval | 50nm on report |
Overall Dimensions | 1.25 inch standards: 1.50 inch diameter x 0.55 inch thick (38.1 x 14mm) with cover |
Spectralon diffuse reflectance standards are used whenever you need to calibrate – or validate the photometric (Y-axis) calibration of – your colorimeter, reflectometer or UV-VIS-NIR spectrophotometer. Wavelength calibration standards allow you to check on the wavelength (X-axis) of your instrument. Spectralon exhibits diffuse reflectance, often termed Lambertian. But what is a Lambertian reflector? Imagine a material which reflects light equally in all directions. It appears equally bright to an observer, regardless of the angle from which they view it. A material that exhibits Lambertian reflectance is one which is a perfectly matte, or diffusely reflecting. In physics, we say that the material obeys Lambert’s Cosine Law, named after Johann Lambert, who described the concept of a perfect diffuse reflector in his 1760 book “Photometria”.
In purely practical terms, by using a diffusely reflecting standard rather than a glossy plastic or ceramic material to calibrate your instrument gives you more consistent results, and results that can be compared between different instruments and between different laboratories. In comparison, a glossy calibration standard will impart a calibration that will depend upon the exact measurement geometry used in the particular instrument.
Many industries rely upon spectral reflectance measurements to ensure the consistency of product performance. These include, but are not limited to:
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