Apparatus for and method of measuring a distribution of luminous

Details Apparatus for and method of measuring a distribution of luminous Apparatus for and method of measuring a distribution of luminous

1998-01-20

1999-06-22

Evans, F. L.

Optics: measuring and testing

Lamp beam direction or pattern

G01J 102

Patent

active

059147776

ABSTRACT:
An ellipsoidal mirror having an axis of rotational symmetry is disposed so that a first focal point thereof is positioned in vicinity of a measurement area of a light source to be measured. The ellipsoidal mirror reflects parallel light beams from the measurement area onto an optical focal plane on which the reflected light beams are focused, whereby a luminous intensity distribution image of the measurement area is formed on the optical focal plane. The luminous intensity distribution image is directed via a relay lens system onto a sensing surface of an image pickup unit. A distribution of luminous intensity of the measurement area is obtained based on the luminous intensity distribution image.

REFERENCES:
patent: 5729336 (1998-03-01), Prettyjohns et al.
patent: 5818571 (1998-10-01), Prettyjohns et al.

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