MONITORING SYSTEM FOR POSITION SENSING AND RECIPROCATING ROD USED THEREIN

摘要

MONITORING SYSTEM FOR POSITION SENSING AND RECIPROCATING ROD USED THEREIN A monitoring system and rod used therein for position sensing is provided which incorporates a rod member in which there are zone areas of different magnetic character from the base rod member. These zone areas are produced by precisely locally heating the rod in selected areas in the presence of at least one phasechanging element so that a phase change occurs and creates the zone of different magnetic character than that of the base rod member.