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US 7,130,033 B2Granted
Portable device for measuring the light intensity from an object, and the use of such a device
AssigneeOptis Co., Ltd.
InventorJacques Delacour
Life of this patent
Estimating the term…
Abstract
The invention relates to a device for measuring the light intensity of an object or object portion. The device comprises a dioptric central portion and a catadioptric peripheral portion that are independent from each other and that are suitable for delivering, from the light diffused by the object, two non-intersecting beams of the same kind, and a two-dimensional video sensor associated with an imaging device in order to obtain an image of the beams.
Claims26
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.
4 more elements
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 catadioptric peripheral portion of optical axis and of object focus that coincide respectively with said optical axis and said object focus of said dioptric central portion, said catadioptric peripheral portion 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 catadioptric peripheral portion 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.
4 more elements
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 converging 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 point of said dioptric central portion;
- and
- an elliptical reflector of optical axis and of object focus that coincide respectively with said optical axis and said object point of said dioptric central portion, said elliptical reflector being suitable for generating a second converging beam from the light diffused by said object or object portion at an angle of inclination that is large relative to said optical axis when said object is placed at said object focus, and in which said dioptric central portion and said elliptical reflector are arranged in such a manner that the rays of the first and second beams converge on a common focus point, said reflector being independent of said dioptric central portion, the rays of said second beam not intersecting the rays of said first beam in the object plane situated at the outlet of the elliptical 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.
4 more elements
A device for measuring the light intensity of an object or an object portion, the device comprising:
- a dioptric central portion constituted by a converging aspherical interface surface adapted to generate a first converging 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 interface surface;
- and
- a catadioptric peripheral portion of optical axis and of object focus that coincide respectively with said optical axis and said object focus of said dioptric central portion, said catadioptric peripheral portion being independent of said dioptric central portion, and being suitable for generating a second converging 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 catadioptric peripheral portion 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 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.
4 more elements
Dependencies are inferred from the claim text.