Flame-detecting apparatus including a field-limiting device

Details Flame-detecting apparatus including a field-limiting device Flame-detecting apparatus including a field-limiting device

1979-12-19

1982-05-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250229, 250554, 350 9618, 350272, G01N 2158, G08B 1712

Patent

active

043284884

ABSTRACT:
In a flame-detecting apparatus for developing an electrical signal responsive to light, impinging on a light-responsive surface from a predetermined flame area, for example, in a combustion chamber, a convex lens member is disposed at a distance from the surface longer than the focal length of the lens member such that light impinging substantially perpendicularly to the lens member is converged then slightly diverged onto the light-receiving surface. An aperture-defining member is positioned approximately at a focal point of the lens member between the lens member and the light-receiving surface for only giving a light passage around a light axis of the lens member, the cross-sectional area of the light passage being smaller than that of the light-receiving surface so that extraneous light impinging obliquely on the lens member is prevented from passing to the light-receiving surface.

REFERENCES:
patent: 2339754 (1944-01-01), Brace
patent: 2354400 (1944-07-01), Percy
patent: 2972930 (1961-02-01), Norwood
patent: 3041929 (1962-07-01), Norwood
patent: 3504183 (1970-03-01), Salkowski et al.
patent: 3582666 (1971-06-01), Geiger
patent: 3824391 (1974-07-01), Noltingh et al.
patent: 3993900 (1976-11-01), Hulme
patent: 4037113 (1977-07-01), Moore
patent: 4131540 (1978-12-01), Husome et al.

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