The Integrating Sphere system has been designed and constructed according to the specifications detailed in the following paragraphs.

The Integrating Sphere  system has been designed and constructed according to the specifications detailed in the following paragraphs. The inside wall of the sphere is coated with a material that is nearly a Lambertian diffuser and at the same time has a high directional hemispherical diffuse reflectance! The sphere has entrance, sample, and reference ports, all centered on a great circle of the sphere,. There is also a detector port, with its center located along the normal to the great circle. An integrating-sphere system is designed and constructed for measuring a variety of optical properties in the IR spectral range. Integrating spheres are also applied to an averaging device for detectors. Due to the helpful propertities of an integrating sphere, an averaging sphere’s entrance port can be significantly larger and spatially uniform. The benefits of using an integrating sphere for detecting light more accurately are used in the design of system and development of the method. The measurement of absolute transmittance, reflectance, and absorptance of specular samples is described and demonstrated.