UV radiometric scales and calibration services

Final Report

This project is concluded because international comparisons in the UV spectral range are carried out on a regular basis within the frame of CCPR and EURAMET TC-PR.

Progress Report 2014-03-20

No significant activity to report.

Progress Report 2013-02-25

No significant activity to report.

NPL is continuing to refer all those requesting measurements in the VUV spectral region to PTB.For measurements in the region 200 nm – 400 nm, NPL has established scales of spectral radiance and spectral irradiance based on a radiometrically-calibrated black body. The spectral irradiance scale is being compared with that at PTB and elsewhere via CCPR Key Comparisons K-1a and K1-b. The measurements for the spectral region 250 nm – 400 nm for the K1-a comparison (using tungsten halogen lamps) have been completed and a draft A report is in preparation. Measurements for the K1-b comparison (using deuterium lamps) are currently underway. A comparison with the irradiance scale previously maintained at NPL has also been performed.


VUV & UV responsivity scale: PTB(Berlin) will establish a responsivity scale from 0.2 to 300nm, available in approximately 4years time. PTB will provide NPL with transfer standards covering 100-300nm, and will also provide a calibration service covering this spectral region.

UV Spectroradiometry: PTB is to update its facilities for the spectral region 40-400nm by provision of a new monochromator on a BESSY beam line. PTB will provide traceable calibration of transfer standard deuterium lamps selected and provided by NPL, and NPL will use these to maintain a service for UV spectral radiance calibrations.

Absolute radiometry and spectral emission scales: NPL plans to establish a new spectral emission scale based on absolute radiometric measurements, covering the spectral region 250-1000nm. PTB(Berlin) and NPL will intercompare this scale with the synchrotron scale over the range 250-400nm.



Further Information

Progress report submitted in May 2004.

Photometry and Radiometry (PR)
Teresa Goodman, NPL (United Kingdom)
Phone: +44 208 943 6863
Fax: +44 208 943 6283
E-Mail: teresa.goodman@npl.co.uk
Coordinating Institute
NPL (United Kingdom)
Participating Partners
PTB (Germany)