The construction, calibration, and use of an integrating cube scattering detector used to measure scattering losses in optical fibers is described. The detector consists of six 1-cm sq silicon solar cells, each sensitive surface of which comprises one interior surface of a cube 1 cm on edge. Small holes in the center of two opposite faces of the cube permit the optical fiber to pass through the detector so that all the scattered light falls on a photosensitive surface.
A. R. Tynes, "Integrating Cube Scattering Detector," Appl. Opt. 9, 2706-2710 (1970)