The Near-infrared region is normally considered to cover the wavelength range from 750 nm to 2500 nm, and Starna have developed reference materials for absorbance and wavelength qualification in this region. A new, NIST traceable wavelength reference has also been developed for the Mid-infrared. 

Absorbance  References

Metal-on-Quartz Neutral Density Filters (250 - 3200 nm)

 NIR Solution Reference

This Reference Material can be used to qualify the Absorbance scale, in the ultra-violet, visible and near-infrared regions of the spectrum (250 nm to 3200 nm) 

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NIR Neutral Density Filters
(800 nm to 3200 nm) 

NIR Transflectance Reference

These references can be used to qualify the absorbance accuracy and linearity of near-infrared spectrophotometers over the wavelength range 800 nm - 3200 nm.

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Wavelength References

NIR Wavelength Reference Solution Reference (900 – 2600 nm)

 nir

This Reference Material can be used to qualify the wavelength calibration, in the Near Infrared region of the spectrum of spectrophotometers in transmission mode with spectral bandwidths of 5 nm or less.

 

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NIR Transflectance Reference
(900 – 2600 nm)

NIR Transflectance Reference

This Reference Material is specially designed for the wavelength qualification of near infrared reflectance spectrophotometers.

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Near-and Mid-infrared Polystyrene References
(1.1µm to 18.5µm, 9000 cm-1 to 540 cm-1)

polystyrene

This popular reference material is now available as a NIST-traceable CRM covering wavelengths from 1.1µm to 18.5 µm (9000 cm-1 to 540 cm-1). A total of 20 peaks is available for wavelength qualification purposes.

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Some references used in the visible region have useful peaks in the NIR and are included here for information:

Didymium Glass Filter
(430 nm to 890 nm)

didymium glass

The Didymium filter has 11 well-defined peaks  from  430 nm to 890 nm

 

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Didymium Oxide Solution
(290 – 870 nm)

 Didymium Oxide solution

The spectrum of didymium in perchloric acid contains 14 peaks from 290 nm to 870 nm

 

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