Optical collimator target illumination

Details Optical collimator target illumination Optical collimator target illumination

1986-05-12

1987-12-29

Scott, Samuel

Illumination

Light source and modifier

Including translucent or transparent modifier

362 32, 362326, 350 9627, F21V 800

Patent

active

047165073

ABSTRACT:
Collimators are widely used optical instruments for testing, calibrating and measuring. In one type of collimator slits or patterns, called targets, are said to be projected to infinity. Placing a target in the focal plane of a collimator is a known technique for making a uniform target appear to be in the far field. This led to the use of collimators in training devices and in target simulations. When a surface is illuminated by a small light source, as is the target in a collimator, the illumination of points on the target surface off the light axis will be lower than illumination of the area of the surface on the axis. Since the peripheral surface illumination is a function of the cosine fourth power, there is considerable reduction in illumination at the periphery of a target. Mitigation of peripheral target of illumination in collimators is overcome herein by disposing a fiber optic faceplate between the light source and the target.

REFERENCES:
patent: 3033071 (1962-05-01), Hicks, Jr.
patent: 3735032 (1973-05-01), Goetze et al.
patent: 4462662 (1984-07-01), Lama
Radiation, Light, and Illumination by C. P. Steinmetz, McGraw-Hill, NYC & ndon c. 1909, pp. 260-261.

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