PHOTOMETRIC DEVICE FOR MEASURING IRRADIANCE Russian patent published in 1994 - IPC

FIELD: photometric testing. SUBSTANCE: photometric device for measuring irradiance including a light receptor with a spheric outer surface, light guide and radiation detector. The light guide is made in the form of a plurality of optic fibers inlet end-faces of which are mounted on the outer surface of light receptor and outlet end-faces are located within a figure similar to working surface of radiation detector and optically coupled with this surface. In measuring plane irradiance an angular distance between the centers of inlet of end-faces of two adjacent optic fibers in a plane containing an optic axis is determined from the expression given in the invention description. If the inlet end-faces are uniformly located on the outer surface of light receptor, their light cross-section is determined from the expression given in the invention description as well. EFFECT: enhanced accuracy and reliability. 3 cl, 1 dwg