Browse Prior Art Database

Compensator For Optical Inhomogeneties

IP.com Disclosure Number: IPCOM000097320D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Cooper, L: AUTHOR

Abstract

The system compensates for optical inhomogeneties in the atmosphere between a sighting station and a target. Such inhomogeneties are due to thermal gradients, wind disturbance, etc., and cause apparent dancing of the image of the target at the sighting station.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 94% of the total text.

Page 1 of 2

Compensator For Optical Inhomogeneties

The system compensates for optical inhomogeneties in the atmosphere between a sighting station and a target. Such inhomogeneties are due to thermal gradients, wind disturbance, etc., and cause apparent dancing of the image of the target at the sighting station.

Point reference source 10, located adjacent target 11, provides an image 12 via collimator lenses 13 at a focal plane located adjacent telescope 14 at the sighting station. A light chopper, comprising a disc 15 which is rotated by motor 18 and has an arcuate slot 17, is disposed in the focal plane. Transducing mechanism 19 is positioned behind the rotating disc and produces electrical signals. These correspond to the angular coordinates (r, --) of movement of the image due to optical inhomogeneties in the light path between the collimator lenses 13.

The electrical signals are supplied to a transformation matrix 20. This converts these signals to electrical signals corresponding to the orthogonal coordinates (X, Y) of movement of the image. These latter signals actuate driving devices 23 and 24 to control the angular orientations of correction plate 25 about two mutually perpendicular axes. Corrections plate 25 is located in front of telescope 14 and its rotation causes a shift in the position of the image in the telescope. The arrangement is such that the image of target 11 as observed through telescope 14 does not dance, due to the corrective angular movements impart...