References for Visible Spectroscopy

Instruments for use in the visible region only are less subject to regulation than those used in the UV. Good practice, however, requires that they are also qualified to ensure that they are performing correctly. Starna supplies a range of Certified Reference Materials for use in the visible region.

Visible Instrument Qualification Kit

 Part number: RM-1N3N5DHG 

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PRODUCT ENQUIRY

A set of robust glass reference materials for qualifying visible-only spectrophotometers for photometric accuracy and wavelength calibration.

Neutral Density Filters (1.00, 0.50 & 0.25 A) Absorbance Accuracy, 440-635 nm More information
Holmium Glass Filter  Wavelength Accuracy, 240 - 640 nm More information

 

Absorbance References


Neutral Density Filters (440-635nm) -
glass filters with absorbances from 0.04 A to 3.5 A

Metal-on-Quartz Neutral Density Filters (250-635 nm)equivalent to NIST SRM 2031

Starna Green (250-650 nm) - wavelength and absorbance for instruments with bandwidths >5nm

Combined Holmium/Neutral Density glass (360 - 640 nm) – check absorbance and wavelength with one filter! NEW!

Combined Didymium/Neutral Density glass (430 - 890 nm) – check absorbance and wavelength with one filter!NEW!


 

 

Wavelength References


Holmium Oxide Liquid (240-650 nm)
- the most widely used reference for wavelength accuracy – accepted by all major Pharmacopoeias

Didymium Oxide Liquid (290-870 nm) – useful peaks in the NIR

Holmium Oxide Glass (270-640 nm) –  useful for routine checks  

Didymium Glass (430 - 890 nm) –  useful for routine checks

Combined Holmium/Neutral Density glass (360 - 640 nm) – check absorbance and wavelength with one filter! NEW!

Combined Didymium/Neutral Density glass (430 - 890 nm) – check absorbance and wavelength with one filter!NEW!

Starna Green (250-650 nm) - wavelength and absorbance for instruments with bandwidths >5nm

Samarium Oxide Liquid (230 – 560 nm) – narrow peaks throughout the spectrum