Usually part of the integrating sphere assembly

An Integrating sphere is a device used to test and measure certain propertities of a light source .Just as the name,integrating sphere implies,one of the main functions of the device is that it can spatially integrate the light flux.The light is unfiormly diffused over the entire surface of the sphere by means of a highly degree of diffusion this diffusion allows for measurement of propertities ,which couldn't be observed for or measured.Integrating spheres are highly reflective enclosures that are placed in close proximity to the sample, such that the reflected light enters the sphere, bounces around the highly reflective diffuse surface of the sphere wall and finally impinges upon the detector – usually part of the integrating sphere assembly.As the name implies, the main part of the device is a sphere with a very highly reflecting inner surface,The surface should approach the ideal Lambertian scatterer, which means that the light falling on the surface is evenly scattered in all directions and the scattered light intensity is proportional to the cosine of the angle of observation.common feature of an integrating sphere is baffle,it is a small physical brrier that prevents direct light radition from passing from the source directly to the detector or other instruments.