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 polystyrene reference has also been developed for the Mid-infrared that is also suitable for qualifying Attenuated Total Reflectance (ATR) measurements

Absorbance  References

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

absorbance qualification 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) 

absorbance accuracy and linearity over the wavelength range 800 nm - 3200 nm.
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Wavelength References

NIR Wavelength Reference Solution Reference (900 – 2600 nm)

wavelength qualification in the Near Infrared 
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NIR Transflectance Reference (900 – 2600 nm)    

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)

NIST traceable wavelength references, also accepted by some pharmacopoeias as a wavelength and resolution reference. Versions available for ATR measurements.
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Starna wide-range wavelength reference (335 nm to 1945 nm)

20 peaks for wavelength calibration from UV to NIR
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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)

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Didymium Oxide Solution (290 – 870 nm)  

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This exceptionally wide-range filter contains a mixture of rare earth oxides and provides 20 peaks for wavelength calibration between 335 nm in the UV and 1945 nm in the NIR. It is equivalent to NIST SRM 2065.

Nominal peak wavelength values (in nm) are: 335, 345, 361, 375, 386, 402, 418, 485, 538, 583, 642, 748, 804,976, 1076, 1151, 1222, 1366, 1469, 1945





A Certificate of Calibration and Traceability and full instructions for use are provided with each Reference Material. Starna Scientific is accredited to both ISO 17034 (4001) as a Reference Material producer, and ISO/IEC 17025 (0659) as a Calibration Laboratory for optical reference measurements. Starna offers a Lifetime Guarantee on all its Reference Materials.