US 4,509,104 A · High temperature resistant lighting device

Abstract

This invention is directed to a high temperature resistant lighting device for lighting the interior of a high temperature furnace for observing the furnace interior from the outside. A lighting lamp (5) and an inspection device (9) are housed within a metallic heat protective casing (10) having a cooling path (27) for circulation of cooling water. The lamp and an objective section (91) of the inspection device are rotatable with its associated drives (53) and (97) so that the illuminating direction of light from the lamp and the viewing direction of the objective section are variable so as to direct illuminating light beams from the lamp toward a wall surface of the furnace via a viewing window (4) and focus reflected light beams from the wall surface of the furnace onto the objective section. The light beams focused on the objective section are led out of the furnace through an optical fiber bundle or cable (92) and picked up to form a video image of the wall surface of the furnace by means of a TV camera (17). Accurate and scrupulous observation of the inner wall surface of the furnace is made possible by varying the directions of the lamp and the objective section.

Claims10

Dependent claims

A high temperature resistant lighting device for monitoring a high temperature environment, comprising:

a metallic heat protective casing including a space section formed therein and a window made of a heat protective glass member disposed along a wall thereof, said casing further having a cooling path defined along a wall in said space section, except in said window, for circulation of a cooling medium;
light source means housed in said space section of said metallic heat protective casing for lighting an object to be observed through said window in said high temperature environment, a bundle of optical fibers forming a light conductor cable leading into said heat protective casing, objective means secured in a position in said heat protective casing for picking up light reflected by said object through said window and for introducing the reflected, picked-up light into a tip portion of said light conductor cable, and means leading said light conductor cable outside said heat protective casing for observing said object inside said high temperature environment by an observer outside said high temperature environment.

Dependencies are inferred from the claim text.

High temperature resistant lighting device

Life of this patent

High temperature resistant lighting device

Life of this patent

Abstract

Claims10