FIELD: photometry.
SUBSTANCE: proposed meter includes photodetector and revolving disk mounted in front of it; disk is provided with hollow tubes having calibrated orifices in their side walls; tubes are telescopic and radially movable along guide holes made in revolving disk in form of radial slots; tubes are set in motion by means of radial motion mechanism.
EFFECT: adaptation of meter to beams of different cross section.
2 cl, 2 dwg
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