This paper presents a design and realization of a dual-channel luminance meter for simultaneous measurement of luminance with photopic and scotopic weightings. Such measurements are useful in mesopic conditions, i.e. when the luminance is in the range of 0.005–5 cd m−2. The instrument is a spot luminance meter with two spectrally weighted channels. The collected light is detected with silicon detectors and a computer-controlled dual-channel switched-integration amplifier. The instrument is characterized for relative spectral responsivity against a calibrated spectroradiometer using a radiance source based on an integrating sphere with input from a monochromator. An absolute luminance responsivity calibration is made against a sphere-based luminance standard at a level close to the high end of the mesopic range. The standard uncertainty in luminance responsivity calibration is 0.3% for the photopic channel and 0.6% for the scotopic channel. In addition, characterization measurements were carried out for the instrument’s linearity, stray light sensitivity and polarization dependence. The results show very good noise performance, allowing fast measurements over the whole mesopic range. The noise equivalent power was measured to be approximately 20 fW Hz−1/2, equal to a noise equivalent luminance of 30 µcd m−2 Hz−1/2. Estimated uncertainty of measurements for typical light sources is 2.2% (k = 2) at the lowest luminance levels of the mesopic range.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Luminance meter for photopic and scotopic measurements in the mesopic range


    Beteiligte:
    Shpak, M. (Autor:in) / Kärhä, P. (Autor:in) / Porrovecchio, G. (Autor:in) / Smid, M. (Autor:in) / Ikonen, E. (Autor:in)

    Erschienen in:

    Measurement Science and Technology ; 25 , 9 ; 095001/1-095001/7


    Erscheinungsdatum :

    2014


    Format / Umfang :

    7 Seiten, 15 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Prismatic adaptation under scotopic and photopic conditions

    Graybiel, A. M. / Held, R. | NTRS | 1970


    Driving in snow: effect of headlamp color at mesopic and photopic light level

    Bullough,J.D. / Rea,M.S. / Rensselaer Polytechnic Inst.,US | Kraftfahrwesen | 2001


    Driving in Snow: Effect of Headlamp Color at Mesopic and Photopic Light Levels

    Bullough, John D. / Rea, Mark S. | SAE Technical Papers | 2001


    2001-01-0320 Driving in Snow: Effect of Headlamp Color at Mesopic and Photopic Light Levels

    Bullough, J. D. / Rea, M. S. / SAE | British Library Conference Proceedings | 2001


    Brightness perception in the mesopic range - models and new laboratory experiments

    Haferkemper, Nils / Söllner, Stefan / Polin, Dmitrij et al. | Tema Archiv | 2011