Accession Number : ADD011540

Title :   Atmospheric Transmissometer.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Geller,M

Report Date : 04 Sep 1984

Pagination or Media Count : 13

Abstract : An apparatus and method is described for separately measuring the optical intensities of the following: a sample beam having traversed a sample medium; a backscattered beam having been backscattered by the sample medium; a composite beam composed of the sample beam plus a reference beam having traversed a reference medium; and a second composite beam composed of the backscattered beam plus the reference beam. Measurements of these parameters is accomplished through the use of a linearly polarized source beam whose plane of polarization may be rotated between two orthogonal planes. The source beam is split into the sample and reference beams. The plane of polarization of the sample beam is caused to be rotated 90 degrees from the plane of polarization of the backscattered beam after interaction with the sample medium. The plane of polarization of the reference beam is selectively controlled between two orthogonal planes such that when combined with the sample beam and backscattered beam a polarization analyzer will allow passage of only those portions with a preselected plane of polarization for measurement and analysis of the light intensity.

Descriptors :   *Patents, *Transmissometers, Beams(Radiation), Radiant intensity, Atmospheric physics, Backscattering, Visibility, Transmissivity

Subject Categories : Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE