Characterisation of optical detectors using high-accuracy instruments

F. Manoochehri*, P. Kärhä, L. Palva, P. Toivanen, A. Haapalinna, E. Ikonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)


The facilities of the Metrology Research Institute at the Helsinki University of Technology, and methods for characterisation of optical detectors for spectral radiant intensity and irradiance responsivity, are described. The instrumentation for such characterisations includes a reference spectrometer with a number of auxiliary set-ups, and equipment for the spectral irradiance measurements with a filter radiometer based on a trap detector. The methods of realising the spectral responsivity scales based on an absolute cryogenic radiometer in house are addressed. The procedures and results of characterisation of a multipoint measuring system of photosynthetically active radiation, by employing the available facilities, are briefly described. The absolute irradiance responsivity of the device is determined by using a photometric lamp, whose spectral irradiance has been measured with the filter radiometer. The combined standard uncertainty of this set of calibrations is 3.6% at the 1σ level. The uncertainty is caused almost completely by the multipoint measuring system.

Original languageEnglish
Pages (from-to)327-337
Number of pages11
JournalAnalytica Chimica Acta
Issue number2-3
Publication statusPublished - 2 Feb 1999
MoE publication typeA1 Journal article-refereed


  • Filter radiometry
  • PAR sensor
  • Spectral responsivity
  • Transmittance
  • Trap detector


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