As an accessory of a spectrophotometer, the integrating sphere is mainly used to measure the transmittance or relative diffuse reflection of objects with rough surfaces, such as metal, glass, paper, wood, plastic, powder, etc.

Integral sphere is a hollow sphere with a white diffuse reflective material coated on its inner wall, also known as a photometric sphere, luminous sphere, etc. Open one or several windows on the wall of the ball as light inlet holes and receiving holes for placing light receiving devices.

Integral spheres can be used to test parameters such as luminous flux, color temperature, and light efficiency of light sources. It can also be used to measure the reflectivity of different wavelengths of light on the surface of an object.

Generally speaking, when used with caution, optical diffusion sheets can reduce small errors caused by uneven distribution of incident light sources or beam offset on the detector during measurement, thus improving measurement accuracy. However, in precise measurements, an integrating sphere must be used as an optical diffuser to minimize the aforementioned errors.

When using an integrating sphere to measure luminous flux, the measurement results can be more reliable. The integrating sphere can reduce and eliminate measurement errors caused by differences in the shape, divergence angle, and responsivity of light rays at different positions on the detector.