Reflectance Wavelength Calibration Standards

Rare Earth Oxide Standards

Avian Technologies’ Rare Earth Oxide wavelength calibration standards display sharp absorbance peaks over much of the UV-Vis-NIR spectral range, and are designed for calibration of UV-Vis-NIR spectrometers. The mixture of rare earth oxides is chosen to give the best coverage over the wavelength range of interest.

We offer three rare earth oxide standards:

Packed Powder Wavelength Calibration Standard

This standard is a mixture of highly purified holmium oxide, dysprosium oxide, and erbium oxide in a hermetically sealed black anodized aluminum holder with either 2″ (52mm) or 1.5″ (37 mm) optical glass window. The standard has the same components as NIST SRM-1920a*. The standards are made in large batches and each batch is calibrated traceable to NIST/NRC.

Encapsulated Vis-NIR Standard

This standard complements our encapsulated gray scale standards . The standard has the same components as NIST SRM-1920a*, with a small amount of an inert, spectrally non-absorbing binder, encased in a hermetically sealed Delrin holder. Unlike sintered equivalents of SRM-1920a, this standard exhibits no peak shifting and is both durable and stable. The spectral features are the same as our packed powder wavelength calibration standard. The standard is also available in two extended versions, with the addition of either talc or a polystyrene window to provide extra peaks in the longer wavelength range.

Wavelength Reflectance Standard

The reflectance version of our transmittance wavelength calibration standard is the equivalent of NIST SRM-2036. This standard is ideal for calibration of the wavelength scale of both scanning and Fourier transform near-infrared spectrometers used in the reflectance configuration. The standard consists of a 1.0” diameter WCT-2065 filter backed with Avian Technologies Fluorilon™ FW-99 diffuse reflectance material, in a black anodized aluminum holder designed to fit most spectrometers. This standard is usable in the 320-2200 nm range, and is available calibrated or uncalibrated.

*For detailed information on SRM-1920a, refer to NIST Special Publication SP-250-48 (Spectral Reflectance).

Packed Powder Wavelength Calibration Standard 8° Hemispherical Reflectance Factor

Wavelength Calibration Standard 8° Hemispherical Reflectance Factor

Wavelength Calibration Standard 8° Hemispherical Reflectance Factor – NIR

UV-Vis Calibration Standard Reflectance

Near-IR Standard Reflectance

Long Wavelength Calibration Standards

This Avian Technologies standard combines NIST 2065 glass (Avian Technologies WCT-2065) and polystyrene in a package with a Fluorilon-99W™ backing to give a wavelength standard with useable peaks beyond 2300 nm, to meet the calibration needs for modern portable near-infrared spectrometers.

The standard size is 1.25” diameter (0.950” active area), and is mounted in a Thorlabs MR1 filter mount with a 2” mounting post.. Full calibration data, traceable to NIST/NRC, is provided with each standard.

This standard is also available in a transmittance format.