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Proceedings Paper

Infrared Optical System For An Antitank Homing Head
Author(s): Bernard Christophe-Alain; Delzongle-Pierre Froissart; Michel Perron
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Paper Abstract

A low cost scanning optical system for an antitank seeker head operating in the 8 to 12 pm wavelength region is described. The overall system consists of a spherical dome and a very simple two aspherical elements telescope. The objective provides a high resolution over a 1° by 2° degrees FOV at a relatively large aperture and remains extremely lightweight and compact. This device is included on a two axis gyroscope to allow the line of sight deviation and the inertial stabilization of the gimbal objective. Considerations which direct material selection are presented. They concern : - transmission and absorption coefficients in the spectral domain - thermal and spectral variation of the refractive index - mechanical and thermal properties to sustain the meteorological and missile speed effect. The reflective IR imager is made of two aspheric primary and secondary mirrors which provide - thermal insensitivity - easy aligment procedure in the visible domain - low production cost by means of replication The innovative optical design program principles are presented and the sensitivity to high order asphericities analysed. Optical blur performances of this device are compared to those of a paraboloidal primary - plane secondary one. The manufacturing process for both the master and the replica are reviewed along with the assembly tests. The 55 mm wide - 50 g weight scanning mirror is shown and its main characteristics discussed. Maximum emphasis is put on the technological solutions choosen for its subminiature motorcoil and its position detector. Both "black and white" and "false coloured" images of an armoured vehicule are shown as recorded by the IR seeker during a real time tracking sequence. A ten micrometer hybrid focal plane detector has been developed jointly by SAT and LIR. This technology promises to offer advantages for advanced missile homing heads. Images ob-tained with this direct coupled Cadmium Mercury Telluride photovoltaic detector and CCD multiplexer can be seen

Paper Details

Date Published: 26 October 1983
PDF: 11 pages
Proc. SPIE 0399, Optical System Design, Analysis, and Production, (26 October 1983); doi: 10.1117/12.935468
Show Author Affiliations
Bernard Christophe-Alain, S.A. de Telecommunications (France)
Delzongle-Pierre Froissart, S.A. de Telecommunications (France)
Michel Perron, S.A. de Telecommunications (France)

Published in SPIE Proceedings Vol. 0399:
Optical System Design, Analysis, and Production
Robert E. Fischer; Philip J. Rogers, Editor(s)

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