Self-reference holographic imaging system
First Claim
Patent Images
1. A system for recording a digital hologram of an object, comprising:
- a partially coherent or coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and
a digital sensor intended to record the digital hologram of the object, characterized in that it furthermore comprises a spatial phase modulating assembly consisting of;
a spatial phase modulator located between the object and the sensor, associated with;
a first image-forming device able to form an image A″
of the object at a non-zero distance Δ
z1 from the spatial phase modulator; and
a second image-forming device able to form;
an image of the plane of the spatial phase modulator in a plane located at a non-zero distance Δ
z2 from a plane of the sensor; and
an image A′
of the image A″
of the object, in a plane located at a distance Δ
z′
from the plane of the sensor,the modulating assembly being able to produce in the plane of the sensor a plurality of identical duplicates of the wave diffracted by the object, said identical duplicates being offset from each other but overlapping partially, the identical duplicates forming on the sensor a digital hologram of the object, the hologram being a self-reference hologram.
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Abstract
A system for recording a digital hologram of an object comprises: a coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and a digital sensor intended to record the digital hologram of the object. It furthermore comprises a spatial phase modulating assembly able to produce in the plane of the sensor a plurality of duplicates of the wave diffracted by the object, the duplicates being offset from each other but overlapping partially, these duplicates forming on the sensor a digital hologram of the object, this hologram being what is referred to as a self-reference hologram.
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Citations
13 Claims
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1. A system for recording a digital hologram of an object, comprising:
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a partially coherent or coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and a digital sensor intended to record the digital hologram of the object, characterized in that it furthermore comprises a spatial phase modulating assembly consisting of; a spatial phase modulator located between the object and the sensor, associated with; a first image-forming device able to form an image A″
of the object at a non-zero distance Δ
z1 from the spatial phase modulator; anda second image-forming device able to form; an image of the plane of the spatial phase modulator in a plane located at a non-zero distance Δ
z2 from a plane of the sensor; andan image A′
of the image A″
of the object, in a plane located at a distance Δ
z′
from the plane of the sensor,the modulating assembly being able to produce in the plane of the sensor a plurality of identical duplicates of the wave diffracted by the object, said identical duplicates being offset from each other but overlapping partially, the identical duplicates forming on the sensor a digital hologram of the object, the hologram being a self-reference hologram. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification