Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Described herein are systems and methods for Young's modulus and Poisson's ratio determination of an object of arbitrary geometry. A measured vibrational response spectrum of the object is collected, and a simulated vibrational response spectrum of the object is generated. The measured vibrational response spectrum is compared with the simulated vibrational response spectrum. The comparison is treated as a global nonlinear optimization problem. An objective function is proposed to enable comparison of two spectra, which are available on two incompatible frequency scales, and have different number of peaks. The actual values of the Young's modulus and the Poisson's ratio are identified as the best-fitting values that minimize a mismatch between the simulated vibrational response spectrum and the measured vibrational response spectrum. Suitable systems for performing the methods are also provided.

Abstract: 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.