Description
| Holmium Glass, Wavelength reference filter, NIST traceable | RM-HG |
| Didymium Glass, Wavelength reference filter, NIST traceable | RM-DG |
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Description & Traceability |
Holmium glass filter and Didymium glass filter, NIST traceable complete with UKAS ISO/IEC 17025 accredited certificate of calibration |
| Primary Usage | Verification of wavelength scale accuracy in both UV and visible |
| Usable Range | 241 nm to 640 nm (Holmium). 430 nm to 890 nm (Didymium) |
| Spectral Bandwidth | The certificate indicates the above wavelength measured at 0.1, 0.25, 0.50, 1, 1.5, 2, and 3 nm. Other SBWs can be provided on request. |
| Physical Configuration | Stress free glass filter mounted in an anodized aluminum holder |
Product Description:
Both Holmium and Didymium provide distinctive peaks that make each suitable for use as a wavelength standard. These robust Starna filters are more suitable for some environments than the liquid cells. They are mounted in an anodized aluminum housing to protect the polished surfaces.
The Holmium and Didymium glass filters are used to ensure that the instrument wavelength scale is within the expected tolerances for the actual wavelength being measured.
Suggestions for Use:
Holmium and Didymium filters present a wide range of peaks that can be resolved. The number of peaks resolved will depend on the spectral bandwidth used. The wavelength peaks can then be used to compare the wavelength indicated by your spectrophotometer to the known peaks.
The initial procedure should be to scan the filter over the usable range to identify all the peaks that can be resolved at the specified SBW of the instrument. Adjust the Spectral Bandwidth and scan rate to produce a usable spectra. Check each peak to ensure that the reading on your spectrophotometer is within the manufacturer's tolerances of the wavelength readout. If not, a service technician may be required to check or adjust your instrument. The filters should be measured against air.
Spectra should be checked regularly, at a minimum in the area of regular analysis. Periodic use of the Holmium or Didymium reference will enable the user to build a data log of the instrument’s spectral accuracy for use with certification and troubleshooting should the correlation change over time.
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