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| Number | Title | Issue Date |
| 4707135 | Apparatus and method for the recording and readout of multiple exposure holograms An apparatus 10 and method for the recording and readout of multiple exposure holograms. For recording, the plane of polarization of the multiple pulsed linearly polarized laser beam 14 from source 12 is rotated by half-wave plate 26. Polarizing beam spli... | 11/17/1987 |
| 4687281 | Synthetic aperture laser radar A synthetic aperture laser radar outputs a dual beam that overlaps at a distant object to form a moving fringe pattern. The object reflects back a return beam to the radar where a receiver makes a holographic image of the object on a photographic medium. ... | 08/18/1987 |
| 4643514 | Internal structure holography A method and apparatus are provided for the holographic examination of the internal features of cavities and passageways of a structure. The apparatus employs laser beam sources positioned within the structure to form a laser reference beam and laser obje... | 02/17/1987 |
| 4612797 | Leak locating and mapping system and method A leak locating, mapping and measuring system (10) comprising an image recording medium (32), a laser (18), optical components (22) which cooperate with the laser to produce and superimpose successive holographic images of the test subject (12) upon the r... | 09/23/1986 |
| 4542955 | Device for illuminating an electro-optical medium for recording holograms in real time The invention relates to electro-optical media which make it possible to record holograms in real time. It consists in using a lamina of a selected material such as bismuth-silicon oxide, this lamina being subjected to a transverse electric field perpendi... | 09/24/1985 |
| 4529310 | Device for detection of center of rotation of rotating object A device for the detection of the center of rotation of a rotating object under test comprises means for illuminating a laser beam on at least one position on the surface of the object thereby generating an interference fringe, means for subjecting the re... | 07/16/1985 |
| 4466693 | Holographic straightness meter A holographic straightness meter comprising an optical element and a hologram disposed on a moving member and one pair of reflection elements disposed on a fixed member. The object beam and reference beam from the optical element are reflected by the refl... | 08/21/1984 |
| 4428675 | Method of and apparatus for double-exposure holographic interferometry Double-exposure holographic interferometry is carried out using first and second lasers (11), (12) responsive to respective applied firing signals for producing respective pulsed output beams. An optical system is provided oriented such that the output be... | 01/31/1984 |
| 4421409 | Open area ratiometer An optical apparatus and method for measuring the percent of open area of a perforated sheet. The apparatus and method based on Fourier optics uses a light detector which measures only a small central portion of the light in a Fraunhofer diffraction patte... | 12/20/1983 |
| 4305666 | Optical heterodyne detection system and method A system to achieve heterodyne detection of optical (i.e., infrared, visible and ultraviolet) signal wavefront is disclosed. The system employs a holographic phase grating that, when illuminated by laser radiation, will generate a plurality of wavefronts ... | 12/15/1981 |
| 4212536 | Holographic subtraction with phase modulation to distinguish phase and amplitude differences Two substantially identically patterned transparencies, i.e. a master photomask and a copy thereof, are compared with each other by transluminating the master with an object beam, producing a hologram of that master by letting the object beam interfere wi... | 07/15/1980 |
| 4197010 | Length standard comparison method and apparatus utilizing holographic interferrometry A hologram of a wave front reflected by the end of a primary standard, either produced by exposure of a plate in the apparatus or synthesized by computer, is illuminated by a laser with a direct beam and with a beam reflected from the end of a standard to... | 04/08/1980 |
| 4120559 | Method of establishing secret information A method for establishing and reading secret information using holographic interference pattern techniques. A holographic plate is placed in a holder and exposed with a laser light reflected from an object and a reference laser light to create a hologram.... | 10/17/1978 |
| 4118124 | Holographic shearing interferometer The sheared interference fringe of a wavefront from an object under test is obtained by recording on a first hologram the interference fringe formed between a first reference light beam and two light beams having slightly different angles of incidence wit... | 10/03/1978 |
| 3950103 | Method and apparatus to determine spatial distribution of magnitude and phase of electro-magnetic fields especially optical fields A method and apparatus for numerical determination of the distribution of magnitude and phase of a time harmonic electromagnetic, particularly an optical, wave field by using the wavefront of a reference wave as the optical reference surface and by introd... | 04/13/1976 |
| 3934461 | Multiple exposure holographic interferometer method Apparatus and method wherein a photographic plate is doubly exposed by pulsed laser illumination to record successive instants in the history of an object under consideration. The doubly exposed plate is then developed and the photograph or hologram is us... | 01/27/1976 |
