Importance

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Abstract

A target system adapted for use in a cassegrain reflective optical collimator system comprises a single target pattern including at least one visible target, at least one near infrared target and at least one far infrared target. This single test target pattern is joined to a heat-transmitting target support member positioned behind the target pattern, to a heater behind the heat-transmitting target support member, to an insulator behind the heating means, and to an illuminator for each of the targets in the single target pattern behind the insulator plate. The elements of the target system are cemented together in precise registration to form a rugged reliable unit that is low in cost, and that includes all the targets in a single focal plane positioned precisely and as accurately as one micron, which results in optical angular position accuracies of at least 20 microradians when the target is positioned in a long focal length optical system.

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First Claim