Patent ID: 7130033

Claim:
A device for measuring the light intensity of an object or an object portion, the device comprising: a dioptric central portion adapted to generate a first collimated beam from the light diffused by said object or object portion at an angle of inclination that is small relative to the optical axis of said dioptric central portion, when said object is placed at the object focus of said dioptric central portion; and a parabolic reflector of optical axis and of object focus that coincide respectively with said optical axis and said object focus of said dioptric central portion, said reflector being independent of said dioptric central portion, and being suitable for generating a second collimated beam from the light diffused by said object or object portion at an angle of inclination that is large relative to said optical axis, the rays of said second beam not intersecting the rays of said first beam in the object plane situated at the outlet of the reflector and the dioptric central portion; said measurement device further comprising: an imaging device and a two-dimensional video sensor associated with the imaging device, the imaging device for obtaining an image of said first and second beams in an object plane, each ray of said beams having, in said object plane, a distance from said optical axis that is a function of said angle of inclination; and measurement means for measuring from said image the intensities of the rays of said first and second beams as a function of said angle of inclination.