Abstract

The reflectance R of a real surface can be separated into the specular reflectance R_s and the diffuse reflectance R_d, the latter also referred to as diffusion or Tight scattering. R_d is usually a function of the scattering angle, with its maximum intensity directed into the specularly reflected light beam. Hence, with a finite acceptance solid angle of any real detector always some fraction of experimentally determined R origins from R_d, its value depending on the detector solid angle. By this, the accuracy of different reflectance measurement methods and instruments is difficult to compare. With this work, we are aiming on an exact separation of R_s and R_d, thus enabling the accurate measurement of the specular reflectance of highly reflecting mirrors, e.g. as used in laser gyro applications.

© 1984 Optical Society of America