Radiation pyrometer with gas purge

Details Radiation pyrometer with gas purge Radiation pyrometer with gas purge

1985-05-06

1987-03-17

McGraw, Vincent P.

Optics: measuring and testing

Optical pyrometers

350582, 374125, G01J 502, G02B 700

Patent

active

046503188

ABSTRACT:
A radiation pyrometer has an inner tube with a lens mounted in a rear portion which is stepped to a forward portion of reduced diameter that is open at its forward end. An 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 that the external diameter of the forward end of the inner tube and larger than the internal diameter. The outer tube has gas inlets into the passage which are located rearwardly of the forward end of the inner tube, 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 aperture, thereby setting up a substantially constant pressure in the rear portion of the inner tube and reducing the entry of contaminants.

REFERENCES:
patent: 2576514 (1951-11-01), Bianco et al.
patent: 3310356 (1967-03-01), Borberg
patent: 3321265 (1967-05-01), Clave et al.
patent: 4306835 (1981-12-01), Hurley
patent: 4400097 (1983-08-01), Koschnitzke et al.

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