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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...
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4208637 |
Tunable optical device
A tunable optical device is produced by forming in the surface of a substrate a fan-shaped grating of continuously varying period by means of a holographic technique using a photoresist and twisted...
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4118104 |
Split hologram and methods of making and using same
A holographic recording method for making a split hologram of an illuminated object from a holographic sensitive member, the method comprising the steps of segmenting both the illuminated object...
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4093382 |
Hybrid holographic non-destructive test system
An automatic hybrid holograhic non-destructive testing (HNDT) method and system capable of detecting flaws or debonds contained within certain materials. This system incorporates the techniques of...
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4054358 |
Recording a phase hologram having reduced intermodulation distortion
A moveable mask with a pin hole therethrough is disposed between a source of an object beam and a holographic recording medium. The pin hole limits the angular range of rays of the object beam...
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4029507 |
Process for the production of lightfast phase holograms utilizing ammonium dichromate and gelatin as photosensitive recording material
Hardenable gelatine recording materials are used in a process for the production of lightfast phase halograms. The recording material is hardened by the exposure to light and sensitized with...
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4008967 |
Device for testing masks for semiconductor components
A device for testing masks, such as used in producing semiconductor components characterized by a source projecting a beam of coherent light at the mask, a multiple optic means which is either a...
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3984671 |
Optical process for producing classification maps from multispectral data
A method of producing single-class and multi-class composite classification maps from multispectral data is provided. The multispectral data is transformed into a binary matrix format which is then...
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3976380 |
Holographic arrangement for testing materials without destroying same
A method and apparatus for nondestructive testing of articles by holography in which light beams from a virtual point source of laser light and from an observation point are reflected by a...
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3950707 |
Quantum amplifier having passive core and active cladding providing signal gain by interaction of evanescent-wave components of signal and pump beams propagating along the core
An optical amplifier particularly for use in a high data-rate fibre-optics communication link utilizing a body of a dielectric substance transparent to signal light of a given band of wavelengths...
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3936140 |
Arrangement for sequential data storage
An apparatus for sequential data storage employing a coherent light source from which an object wave and a reference wave source symmetrical to one another are created, each wave being directed...
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3911230 |
Holographic reproduction of sound
A recording and reproducing method in which the groove undulations of a typical disk phonographic recording are transformed into a hologram. The hologram is then mounted for relative movement with...
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3883215 |
Holographic system for non-destructive testing
A holographic system for non-destructive testing in which a mirror provid illumination of a surface of a test object is positionable to direct illumination on the object at varying angles with...
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3876990 |
Methods of storing information using arrays of multiple spot patterns
The systems of this invention involve the storage of information on a record medium in the form of patterns of spots arrayed along one or more tracks, the patterns are spaced apart a distance which...
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3873181 |
INFRARED CORRELATION METHOD USING THERMOCHROMICS HAVING A HYSTERESIS PROPERTY
Disclosed are methods and apparatus for recording and reproducing optical information in thermochromic materials; exemplary materials are the ternary halides, ternary chalcogenides, and certain...
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3838912 |
OPTICAL DEFLECTING APPARATUS
In a holograph memory device, an incident beam from a laser source is displaced parallelly by a first optical deflector. This emergent beam from the first optical deflector is then angularly...
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3837726 |
CAMERA FOR MAKING HOLOGRAMS
A camera for making a hologram is provided with a device for varying the optical path length of the object light or the reference light. The camera includes a range finder to measure the distance...
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3831031 |
ZONE PLATE IMAGING SYSTEM
A nuclear imaging system for mapping a spatially distributed source of high energy nuclear particles from a living organ which has selectively absorbed a radioactive compound in which the nuclear...
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3829832 |
SYSTEM FOR RECOGNIZING PATTERNS
A system for recognizing patterns arranged in rows and columns with the rows forming elements of a given input group and the columns forming elements of a given input group so that there are a pair...
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3826555 |
HOLOGRAPHIC CAMERA FOR FORMING PLANAR OR VOLUME HOLOGRAMS
A holography device which comprises a beam splitter arranged in the optical path of an incident beam from a beam source, said beam splitter splitting said incident beam into at least three beams,...
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3797944 |
NON-DESTRUCTIVE TESTING OF ACOUSTICAL HONEYCOMB PANELS
A time average holographic transparency photograph is made of the imperforate surface of acoustical honeycomb panel having a plurality of cells while the perforate surface is subjected to sound...
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3796476 |
METHOD OF MAKING TOTALLY INTERNALLY REFLECTED HOLOGRAMS
A method is described for making holograms by means of linearly polarized object and reference beams, the reference beam being reflected inside the photosensitive emulsion. The plane of...
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3790926 |
METHOD FOR DETERMINING THE SPEED OF A VEHICLE
A method of determining the speed of vehicle, particularly a ship by the transmission of coherent waves, with echo signals being received at a plurality of points along a receiving line extending...
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3788749 |
IMAGE QUALITY RATING SYSTEM
The sharpness of definition of an image on film may be automatically determined by comparing an original image on film with a perturbation of the same image formed from the original image. Such...
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3762215 |
TIME AVERAGE HOLOGRAPHIC CONSTRUCTION TECHNIQUES USING A MODULATED BEAM
A technique for examining vibratory or other changing characteristics of an object by constructing a time averaged hologram of the changing object. In one embodiment, the hologram constructing...
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3761721 |
MATTER WAVE INTERFEROMETRIC APPARATUS
An apparatus is disclosed which makes use of interferometry of the matter waves accompanying particles such as neutral atoms, charged ions or electrons. The apparatus includes a particle source and...
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3749469 |
REDUNDANT FRAUNHOFER RECORDING SYSTEM
When a pinhole array is employed as a redundancy means in recording a redundant Fraunhofer hologram, such as a holographically prerecorded motion picture, a moving noise is normally present in the...
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3748048 |
METHOD OF DETECTING CHANGES OF A SPECULAR SURFACE
A method of detecting small dimensional surface changes in a specular object or of comparing two nearly identical specular objects comprises illuminating a holographic plate by a plane reference...
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3735036 |
REAL TIME INTERFEROMETRY CONTOUR MAPPING SYSTEM
A real time holographic interferometer for measuring height variations or contours on the surface of an object is disclosed. Two interference patterns are formed, one of an object whose surface is...
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3719076 |
APPARATUS FOR THE HOLOGRAPHIC ANALYSIS OF OSCILLATING OBJECTS
A method and apparatus for holographic analysis of oscillating objects, in which the recording laser beam, either before or after being split into reference and object beams, is amplitude modulated...
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3711202 |
HOLOGRAPHIC TESTING APPARATUS
Components of a holographic system are mounted for movement as a unit along a horizontal path of travel. Means for holding an object to be holographed, including a pair of trunnions having a...
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3690159 |
HOLOGRAPHIC INTERFEROMETRY EMPLOYING IMAGE PLANE HOLOGRAMS
A hologram of a test specimen is formed in an optical arrangement including a lens which focuses coherent light reflected by the object onto a photographic plate. A real-time interferometric...
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3677634 |
CONTACTLESS MASK PATTERN EXPOSURE PROCESS AND APPARATUS SYSTEM HAVING VIRTUAL EXTENDED DEPTH OF FOCUS
Forming a photoresist mask pattern by employing a three-dimensional mask having non-reflective passages. The mask pattern is recorded on a holographic plate to form a holographic pattern....
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3668405 |
OPTICAL SYSTEM FOR IDENTIFYING PULSES
An optical system for identifying a pulse or wavetrain or for compressing the time duration of such a pulse. This is effected by passing monochromatic light through a cell containing a solid or...
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3649754 |
REAL TIME INTERFEROMETRY UTILIZING A TELEVISION SYSTEM
A real time holographic interferometer is disclosed. Two interference patterns of an object, one without stressing of the object and one with such stressing, are produced using holographic...
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3645129 |
METHOD FOR ANALYZING THE JOINDER BETWEEN A PAIR OF ABUTTING MEMBERS
A transducer induces vibrations into a member including at least a pair of members joined to one another along a common surface. An exposed section of the two members, which may or may not include...
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3643017 |
APPARATUS FOR CONSTRUCTING A REDUCED INFORMATION CONTENT HOLOGRAM
Apparatus for forming a reduced information content hologram, for transmitting that hologram, and for the reconstruction of a scene or object from that hologram. The reduced information content...
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3642374 |
OPTICAL INSPECTING METHOD
An optical inspecting method described in the illuminating wave and a wave under inspection onto an artificially prepared a holographic test plate, and filtering waves coming through the plate to...
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3630592 |
METHOD AND APPARATUS FOR DETERMINING ENVIRONMENT CONDUCIVE FOR RECORDING INTERFERENCE PATTERNS AND HOLOGRAPHICALLY RECORDING
Methods and apparatus for making a hologram of information on a holographic recording medium provide an object path for an object beam of coherent actinic light leading to the recording medium by...
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3612693 |
METHOD FOR MEASUREMENT OF SURFACE PROFILE CHANGE USING A VERNIER SCALE IN HOLOGRAM INTERFEROMETRY
To measure the amount of surface profile change of an object, a hologram is formed by recording on a photographic media the interference pattern between coherent light divided between a uniform,...
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3604807 |
METHOD AND APPARATUS FOR HOLOGRAPHIC REAL TIME VELOCITY MEASUREMENT
Method and apparatus are disclosed for measuring the velocity of a material using the techniques of holography in conjunction with measurement of a doppler shift frequency enabling the velocity at...
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3592548 |
HOLOGRAPHIC METHOD OF DIMENSIONAL INSPECTION
To dimensionally compare one contour surface with another, one surface is provided with a contrast pattern and a hologram is made of that surface. Then the hologram is reconstructed and the image...
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3590640 |
HOLOGRAPHIC PRESSURE SENSOR
A pressure sensor consisting essentially of a deformable diaphragm having a side subjected to the action of a fluid, liquid or gas, whose pressure is sought to be measured. The other side of the...
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3572934 |
LONGITUDINALLY REVERSED SHEARING INTERFEROMETRY
A type of shearing interferometry is presented in which an interferogram is formed by the object wavefront and its replica folded in the longitudinal direction. An off-axis hologram of the object...
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3551594 |
REAL TIME HOLOGRAPHIC TELEVISION SYSTEM
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3540790 |
METHOD AND MEANS FOR RECORDING AND RECONSTRUCTING HOLOGRAMS WITHOUT USE OF A REFERENCE BEAM
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3541252 |
HOLOGRAPHIC METHOD FOR VIEWING CHANGES IN A SCENE
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3541238 |
REAL TIME THREE DIMENSIONAL TELEVISION SYSTEM UTILIZING WAVE FRONT RECONSTRUCTION TECHNIQUES
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3539260 |
METHOD AND APPARATUS FOR AUTOMATIC ALIGNMENT OF COHERENT OPTICAL SPATIAL FREQUENCY FILTERS
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3532431 |
SHEARING INTERFEROMETRY BY MEANS OF HOLOGRAPHY
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