Energy beam drilling apparatus having optical fiber link position sensor

摘要

Disclosed is an electron beam drilling system wherein an optical fiber link is used to prevent deviant drilling. The position of fixtures within a vacuum chamber is monitored by alignable fiber segments. The junctions of the segments form couples which transmit light from a source to detectors when the fixtures are properly positioned. The alignable fiber segments are mounted on and under the fixtures in a manner which integrally provides protection of the junctions from metal spatter. The light source and detectors are mounted external to the chamber; seals are provided where the fiber segments pass through the chamber wall. The detectors signal a control system to only allow beam output when the fixtures and parts thereon are properly positioned.