Window purging system for a combustion instrument

Details Window purging system for a combustion instrument Window purging system for a combustion instrument

1990-01-23

1992-09-08

Lobo, Ian J.

Optical: systems and elements

Protection from moisture or foreign particle

Fluid directed across optical element

374125, 356 43, G01J 502, G01J 508

Patent

active

051462443

ABSTRACT:
A purging air flow system that causes air to pass over a pyrometer lens or window to keep it clean and free from particulate contaminants has an annular, continuous slot for air inlet around the periphery of the lens to permit flow of air across the lens without any obstructions in the path of flow inwardly from the outer edge of the lens. An asymmetric flow pattern is established across the lens surface, either by having a differential size slot at different peripheral portions of the peripheral edge of the lens or window, or by providing a radial swirl about the axis of the window so that when the air goes through the slot, the tangential velocity creates a moving asymmetric flow pattern on the window surface.

REFERENCES:
patent: 4650318 (1987-03-01), Pointer et al.
patent: 4657385 (1987-04-01), Pointer
patent: 4738528 (1988-04-01), Craft
patent: 4784491 (1988-11-01), Penney et al.
patent: 4786188 (1988-11-01), Myhre et al.
patent: 4836689 (1989-06-01), O'Brien et al.

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