integrating sphere

Integrating spheres have a spherical-shaped inner surface and inner wall made of light scattering material, such as barium sulfate,

having high reflectance. Integrating spheres are effective in causing a light beam (measurement light) entering the sphere to scatter uniformly.

Integrating spheres have a hole (aperture) at the position irradiated by the measurement light. When measuring the measurement light which passes through the sample and enters the sphere, the sample is placed at this aperture. The detector is installed at an aperture (mainly, at the top or bottom of the integrating sphere) where it is not directly irradiated by the measurement light.

The shooting ρ(λ) and the equivalent pass rate of the integrating sphere are the τ(λ) quality index of the integrating sphere.

Reflectivity: The ratio of the radiation dose reflected by an object to the speral space to the radiation to the surface of the incoming object under a given direction.