8.4. Spherical photometer for measuring luminous flux
A spherical photometer for measuring the luminous flux of various light sources is an integrating sphere with an inner diameter of 200 mm and two holes:
1) for the investigated light source,
2) for the radiation receiver.
A shield, which prevents direct light from the source from entering the radiation receiver, is installed inside the sphere.
Figure: 1. Appearance of a spherical photometer for measuring luminous flux