Metrolaser, Inc.

Other

Spectron Development Laboratories, Inc.

Navair Lakehurst, Naval Air Warfare Center Ad (lke)

James D Trolinger

Jacob George

Mohammad Mujtaba Mansoor

David Charles Weber

James E Millerd

James C Earthman

Vladimir Markov

Derek Dunn-Rankin

Benjamin D Buckner

Jian Gao

A lens-less system for holographic imaging or a holographic imaging device is provided. The method/device includes a stationary image sensor to capture an image of a sample illuminated by light from a stationary illumination source. A reference lens-less holographic image may be captured and used as a base line to reduce image artifacts and/or remove noise from the lens-less holographic image. Since real wavefronts produced by a diverging point source are neither perfectly spherical nor planar but a combination of both qualities, theoretical estimates for wavefront reconstruction based on perfectly planar or spherical incident waves cannot be applied accurately. The method/device here provides a solution by performing a calibrated wavefront reconstruction based on equations governing coherent light propagation for both spherical waves and planar waves with a mathematical correlation between numerical magnification and propagation depth to produce accurate three-dimensional details of the object.

System and a method for imaging using lens-less holographic microscopy

Embodiments described herein provide an integrated holographic reconstruction platform that enables a user to perform three-dimensional visualization of a phenomenon by reconstructing holograms using a combination of normalization and propagation algorithms, which yields better results with significantly less demanding processing time and computing resources. Specifically, the integrated holographic reconstruction platform may be implemented as an all-in-one computer software that includes software components of digital holographic reconstruction, de-twinning and optical distortion removal via a user-friendly graphical interface.

Systems and methods for an integrated holographic reconstruction tool with optical distortion removal and de-twinning

A system for quantifying surface characteristics detects and quantifies characteristics of a surface of an object. For example, the system may quantify changes in surface roughness without contacting the specimen and without requiring precise temporal or spatial stability. The system may also quantify the evolution or progression of a particular characteristic of a surface, such as a defect, a slipband, a crack, a microcrack, a pit, a damage feature, corrosion, a contour change, an impact crater, a change in residual stress, and so on. The system may include an energy source, a detector section, and a process section. The energy source transmits a source signal to the surface of the object. The source signal is specularly reflected and/or scattered by the surface to yield one or more received signals. The detector section receives the received signal and, in turn, provides a detector signal indicative of the received signal. The processor applies an algorithm to the detector signal to quantify an evolution in one or more characteristics of the surface.

Methods and apparatus for detecting and quantifying surface characteristics and material conditions using light scattering

A holographic security label and automated reading machine for marking and subsequently authenticating any object such as an identification badge, a pass, a ticket, a manufactured part, or a package is described. The security label is extremely difficult to copy or even to read by unauthorized persons. The system comprises a holographic security label that has been created with a coded reference wave, whose specification can be kept secret. The label contains information that can be extracted only with the coded reference wave, which is derived from a holographic key, which restricts access of the information to only the possessor of the key. A reading machine accesses the information contained in the label and compares it with data stored in the machine through the application of a joint transform correlator, which is also equipped with a reference hologram that adds additional security to the procedure.

Holographic labeling and reading machine for authentication and security

A method and apparatus for remotely measuring such physical properties as surface temperature and strain on or near the surface of an object such as an aerodynamic model utilizes a sensor comprising a holographic diffraction grating in a thin film, formed on or affixed to the surface of the test object, thereby forming an 'optically smart surface.' The sensor is remotely illuminated by one or more optical address beams, which are preferably coherent laser beams. Optical beams diffracted from the surface of the sensor produce interference patterns in a remote photodetection apparatus which permits measurement in changes in grating spatial frequency caused by temperature changes or mechanical deformations of the object surface, or Doppler measurement of particle velocity in a sample volume produced by intersecting beams diffracted from the sensor hologram.

Remote measurement of near-surface physical properties using optically

An improved folded cavity laser having particular application to holographic imaging is disclosed. The laser includes a lasing medium, such as for example a ruby rod, which is optically or electronically 'pumped' in order to provide laser light. The medium includes first and second optical surfaces disposed at opposite ends of the lasing medium. A retro-reflecting roof mirror is disposed in optical alignment with the second optical surface of the lasing medium. A transverse mode selector is provided in optical alignment with the first surface of the lasing medium in order to surpress all transverse modes except those of a desired character. In the present embodiment, the transverse mode selector includes two apertures of approximately two millimeters diameter in order to obtain a laser output with a TEM.sub.00 mode. The use of a twin aperture transverse mode selector in conjunction with a retro-reflecting roof mirror provides at least twice the total cavity length and lasing medium than a conventional holographic pulsed laser, as well as two output beams which are in phase and coherent with each other. These beams may be directly used as an object and reference beam in a holographic system.

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Costa Mesa, CA, United States of America

James D Trolinger