Wide angle narrow bandpass optical filter system

Details Wide angle narrow bandpass optical filter system Wide angle narrow bandpass optical filter system

1978-06-22

1980-01-22

Sacher, Paul A.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250216, 350165, 350166, 350175SL, 350198, 350199, 350207, 356416, G02B 300, G02B 528

Patent

active

041847490

ABSTRACT:
A spherical lens element and a concentric lens element receive light, in that order, from a wide field of view, and diverge all rays so that upon leaving said concentric element, the angles of all rays approximate that of radial lines. This light is then filtered through a concentric narrow bandpass filter to attenuate undesired background light, and is collected by a suitable light collector and detector. Apertures for selecting the field of view and F number are provided.

REFERENCES:
patent: 3278752 (1966-10-01), Brixner

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