Constant magnification optical tracking system

Details Constant magnification optical tracking system Constant magnification optical tracking system

1980-04-30

1982-03-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250235, H01J 314

Patent

active

043202900

ABSTRACT:
A constant magnification optical tracking system for continuously tracking a moving object. More particularly, a constant magnification optical tracking system is disclosed wherein a traveling objective lens (14) maintains a fixed relationship to an object (10) to be optically tracked. The objective lens (14) is chosen to provide a collimated light beam (32) oriented in the direction of travel of the moving object (10) A reflective surface (18) is attached to the traveling objective lens (14) for reflecting an image of the moving object (10) to the lens. The moving object (10) is maintained at the focal point of the traveling objective lens (14). In an exemplary embodiment, the object to be tracked is a free-falling object, and the traveling objective lens is mounted on a holding structure (16) slidably attached to a vertically-extending guiding member (38) so that the free-falling object (10) will be located at the focal point of the objective lens for at least a portion of its free-fall path. In the exemplary embodiment, a motor (44) and control means (54 and 56) is provided for maintaining the traveling objective lens (14) in a fixed relationship relative to the free-falling object (10), thereby keeping the free-falling object at the focal point and centered on the axis of the traveling objective lens throughout its entire free-fall path.

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