Device for generating a carrier in an interferogram
AssigneesCentre National de la Recherche Scientifique (CNRS), Universite Paris-Sud
InventorsGerald Roosen, Gilles Pauliat
Life of this patent
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Abstract
A process for generating a carrier in an interferogram in interferometry device either of the “real-time holographic interferometry” type or of the “double-exposure holographic interferometry” type, including recording a first wave front on a hologram, the first wave front coming from an object; generating a second wave front, in which two wave fronts are superimposed orthogonally polarizing said first and second wave fronts, either naturally or by a modification stage; and passing the orthogonally polarized two wave fronts through a birefringent crystal, a polarizer and a detector to make the two wave fronts interfere.
Claims10
A device for generating a carrier in an interferogram of the real-time holographic interferometry type or of the double-exposure holographic interferometry type, comprising:
- a recorder that records a first wave front hologram, by recording interference of an object beam and a reference beam, the object beam diffused by an object and transmitted to a material of holographic environment, and the reference beam transmitted to the material of holographic environment, wherein a first wave front is comprised of the object beam and the reference beam;
- a plurality of lenses through which the first wave front and a second wave front pass, the second wave front comprised of at least an object beam diffused by the object and transmitted to the material of holographic environment at a time later than the object beam of the first wave front;
- a birefringent crystal through which the two wave fronts pass that orthogonally polarizes the two wave fronts;
- at least one common polarizer through which the two wave fronts pass;
- and
- at least one detector on which an interference between the two wave fronts is formed.
A process for generating a carrier in an interferogram in either of a real-time holographic interferometry device or a double-exposure holographic interferometry device, comprising:
- receiving an object beam and a reference beam;
- recording a first wave front hologram by recording interference of the object beam and the reference beam, the object beam diffused by an object and transmitted to a material of holographic environment, and the reference beam transmitted to the material of holographic environment, wherein a first wave front is comprised of the object beam and the reference beam;
- restoring the first wave front by a readback of the first wave front hologram by the reference beam;
- generating a second wave front comprised of at least an object beam diffused by the object and transmitted to the material of holographic environment at a time later than the object beam of the first wave front;
- passing the first and second wave fronts through a birefringent crystal to orthogonally polarize the first and second wave fronts;
- passing the first and second wave fronts through a common polarizer;
- and
- forming an interference between the first and second wave fronts on a detector.
Dependencies are inferred from the claim text.