Atmospheric transmissometer

Details Atmospheric transmissometer Atmospheric transmissometer

1982-06-01

1984-09-04

Willis, Davis L.

Optics: measuring and testing

By polarized light examination

356434, 356437, G01J 400

Patent

active

044694431

ABSTRACT:
An apparatus and method is described for separately measuring the optical tensities 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.degree. 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. From the various measured intensities available the visibility or transmissivity of a sample medium may be determined. The sample medium may be isolated from the remainder of the transmissometer by a window which will allow unaltered transmission of the sample beam and the backscattered beam from the sample medium. With this configuration the invention may be utilized in an airborne manner, mounted on an airplane for the purpose of measuring transmissivity of atmospheric conditions in clouds.

REFERENCES:
patent: 2849912 (1958-09-01), Plesse et al.
patent: 3560098 (1971-02-01), Witte et al.
patent: 3772525 (1973-11-01), Goodwin
patent: 3784307 (1974-01-01), Jackson et al.
patent: 4001595 (1977-01-01), Reisman

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