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  • Stray Light Glasses

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Starna Scientific Ltd.
52/54 Fowler Road
Hainault, Essex
IG6 3UT
United Kingdom

Last updated 6 June 2018

 

Technique


  • UV-Visible Spectroscopy
  • Visible Spectroscopy
  • Fluorescence Spectroscopy
  • NIR Spectroscopy
  • Raman Spectroscopy
  • Life Sciences
  • Microplate References
  • HPLC

UV-VIS References


  • Instrument Qualification Kits
  • Absorbance
    • Potassium Dichromate (235-430 nm)
    • Nicotinic Acid (210-260 nm)
    • Neutral Density Filters (440-635nm)
    • Metal-on-Quartz Neutral Density Filters (250-635 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Deep UV Reference (190-220 nm)
    • Combined Holmium/Neutral Density glass
    • Combined Didymium/Neutral Density glass
  • Wavelength
    • Didymium Glass Filter (430 nm to 890 nm)
    • Combined Holmium/Didymium Solution
    • Combined Didymium/Neutral Density glass
    • Combined Holmium/Neutral Density glass
    • Starna wide-range wavelength reference (335 – 1945 nm)
    • Starna Green (Broadband SBW instruments) (250-650 nm)
    • Holmium Oxide Liquid (240-650 nm)
    • Holmium Oxide Glass (240-640 nm)
    • Cerium Oxide Solution (200-300 nm)
    • Didymium Oxide Liquid (290-870 nm)
    • Samarium Oxide Liquid (230-560 nm)
    • Deep UV Reference (190-220 nm)
  • Stray Light
    • Specified Wavelength Method
    • Filter Ratio (Meilenz) Method
    • Stray Light Glasses
  • Resolution/Bandwith
    • Toluene in Hexane (265-270 nm)
    • Toluene in Methanol (Derivative Spectroscopy) (265-270 nm)
    • Benzene Vapour (230-270 nm)

Starna Stray Light Glasses

Purpose

Purpose

These Reference Materials can be used to qualify the Stray Light (or Stray Radiant Energy) of ultraviolet and visible spectrometers.

Description and Discussion

Description and Discussion

Glass cut-off filters that allow stray light to be checked, nominally at 280 nm,360 nm and 450 nm. Note that variations from melt to melt of the glass can cause variation in these wavelengths, up to ± 10 nm,  so each Starna filter is individually certified. Sliding window covers are provided to protect the surface from damage when not in use.

Stray light, also called Stray Radiant Energy or Power, is any light reaching the detector that is outside the Spectral Band Width selected for analysis by the monochromator. It can be due to optical imperfections or stray reflections within the monochromator itself or to light leaks or other effects in the rest of the optical system. As the detector cannot discriminate between the analytical wavelength and the stray light, the stray light contributes to the detector signal and introduces an error in the measured absorption. The stray light is not absorbed even at high concentrations of the absorbing species, so its effect is a negative deviation from the linear relationship between concentration and absorbance (the Beer-Lambert law) on which most quantitative determinations are based.

Stray light is wavelength and instrument dependant. It can be present at any wavelength but is most noticeable when the energy throughput of the system at the analytical wavelength is relatively low, and any stray light will be comparatively more significant. At these wavelengths, any deterioration in the instrument optics or light source will exaggerate the apparent stray light, so it is desirable to check it on a regular basis, as it is an excellent way of monitoring the condition of the instrument optics.

The usual way of assessing stray light is to measure, at the desired analytical wavelength, a sample that totally absorbs the radiation at that wavelength, but transmits at all other wavelengths. Any light detected by the instrument is then stray light. 

Practically, the usual method is to use cut-off filters that cut off all light near the analytical wavelength and transmit at all higher wavelengths. The certified wavelength is that at which the spectrum transitions 2.0 A.  Below this wavelength, within the indicated usable range, any indication of light transmission must be stray light. 

Typical spectra

Typical spectra

 

 
 
Catalogue Number

Catalogue Number

Material  Cut-off  Usable range Catalogue Number 

WG275

280 nm  210 - 270 nm  RM-G275 

GG380

355 nm  270 - 350 nm  RM-G380 

GG475

450 nm  350 - 440 nm  RM-G475 
Product enquiry

Product enquiry

Data sheet

Data sheet

 

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