APPARATUS FOR DETECTING MOVING GLASS PLATE WITHOUT CONTACT

摘要

PURPOSE: To detect a glass plate moving in a region having high temperature/ stirred atmosphere without contact by using a photoelectric reflection barrier incorporating a light beam emitter/receiver. CONSTITUTION: A light beam 4 radiated from an emitter/receiver 3 arranged to be protected from any heat sources is concentrated in a selected frequency, subjected to amplitude modulation and introduced through an optical fiber 10 constituting an effective waveguide and a transmission path 6 of a heat resisting material to the proximity of the transfer plane of a glass plate 11 to be detected. Then, since the wall of a transmission path 6 fixes the range of a homogenious medium with equal temperature, the beam 4 passes through an equal temperature route protected from the movement of high temperature air to reach the proximity of the glass plate 11. The emitter/receiver 3 converts the reflected wave of the received light beam 4 to electric waves to be processed by a process unit 1.