Accession Number:

ADD010883

Title:

Wide Field of View Two-Axis Laser Locator.

Descriptive Note:

Patent Application,

Corporate Author:

DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s):

Report Date:

1983-12-27

Pagination or Media Count:

20.0

Abstract:

This document describes a remote laser locator system for viewing a wide field of view and detecting the angular position of a remote laser. A laser beam directed toward the sensor from any position within a 90 degree circular field-of-view can be detected to a positional accuracy of less than 0.1 degree in a two-axis coordinate system. The system utilizes an in-line or coaxial optical sensor having field-of-view FOV optics that compress the field-of-view. The compressed output from the FOV optics is directed through a polarizer and filter to a phase shifter. The phase shifter, a pair of birefringent crystals, encodes the angle of incidence of the laser beam as a phase shift between the two components of the polarized input beam. Subsequently, an analyzer such as a Wollaston prism decomposes the beam into two linear component beams. These component beams are processed through a second phase shifter and an analyzer pair which are rotated axially with respect to the first pair to provide four distinct component beams. These components are condensed through a reimager lens and coupled to an array of intensity detectors. The array detector outputs are then combined to provide two normalized signal proportional to a trigonometric function of the two components of the angle of incidence of the laser beam, indicative of its position in space. Author

Subject Categories:

  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE