Radiation-responsive apparatus

Details Radiation-responsive apparatus Radiation-responsive apparatus

G - Physics

01

J

73/112, 73/52

G01J 5/02 (2006.01) G01J 5/04 (2006.01)

Patent

CA 1225257

Abstract of the Disclosure Known radiation pyrometers have a lens mounted at the forward end of a tube that is located within an outer tube which is supplied with purge gas. In the present invention, the lens is mounted in a rear portion of an inner tube that is stepped to a forward portion of reduced diameter that is open at its forward end. The outer tube extends coaxially around the inner tube and is separated from it by an annular gas passage. The outer tube has an aperture at its forward end that is smaller than the external diameter of the forward end of the inner tube and larger than its internal diameter. Gas inlets in the outer tube open into the passage, the inlets being located rearwardly of the forward end of the inner tube, and the area of the gas inlets being greater than the gap between the forward end of the inner tube and the outer tube. Gas flows through the inlets, along the passage, across the forward end of the inner tube and out the apertures thereby setting up a substantially constant pressure in the rear portion of the inner tube and reducing the entry of contaminants.

481270

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