Browsing Electrical, Electronic and Communications Engineering Research Collection by Author "Kelly, Damien P."

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Browsing Electrical, Electronic and Communications Engineering Research Collection by Author

Browsing Electrical, Electronic and Communications Engineering Research Collection by Author "Kelly, Damien P."

Now showing items 1-14 of 14

Controlling speckle using lenses and free space

Kelly, Damien P. ; Ward, Jennifer E. ; Gopinathan, Unnikrishnan ; Sheridan, John T. (Optical Society of America, 2007-12-01)

The correlation properties of speckle ﬁelds are studied for general paraxial systems. The previous studies on lateral and longitudinal speckle size for the case of free-space propagation (Fresnel transform) are generalized ...
Fundamental diffraction limitations in a paraxial 4-f imaging system with coherent and incoherent illumination

Kelly, Damien P. ; Sheridan, John T. ; Rhodes, William T. (Optical Society of America, 2007-07-01)

In the usual model of an imaging system, only the effects of the aperture stop are considered in determining diffraction-limited system performance. In fact, diffraction at other stops—those associated with different lens ...
Generalized Yamaguchi correlation factor for coherent quadratic phase speckle metrology systems with an aperture

Kelly, Damien P. ; Ward, Jennifer E. ; Gopinathan, Unnikrishnan ; Hennelly, Bryan M. ; O'Neill, Feidhlim T. ; Sheridan, John T. (Optical Society of America, 2006-12-01)

In speckle-based metrology systems, a finite range of possible motion or deformation can be measured. When coherent imaging systems with a single limiting aperture are used in speckle metrology, the observed decorrelation effects ...
Magnitude and direction of motion with speckle correlation and the optical fractional Fourier transform

Kelly, Damien P. ; Hennelly, Bryan M. ; Sheridan, John T. (Optical Society of America, 2005-05-10)

The optical fractional Fourier transform (OFRT) in combination with speckle photography has previously been used to measure the magnitude of surface tilting and translation. Previous OFRT techniques used to determine ...
Motion detection, the Wigner distribution function, and the optical fractional Fourier transform

Sheridan, John T. ; Hennelly, Bryan M. ; Kelly, Damien P. (Optical Society of America, 2003-06-01)

It is shown that both surface tilting and translational motion can be independently estimated by use of the speckle photographic technique by capturing consecutive images in two different fractional Fourier domains. A ...
Paraxial speckle-based metrology systems with an aperture

Kelly, Damien P. ; Ward, Jennifer E. ; Hennelly, Bryan M. ; Gopinathan, Unnikrishnan ; O'Neill, Feidhlim T. ; Sheridan, John T. (Optical Society of America, 2006-11-01)

Digital speckle photography can be used in the analysis of surface motion in combination with an optical linear canonical transform (LCT). Previously [D. P. Kelly et al. Appl. Opt. 44, 2720 (2005)] it has been shown that ...
Speckle orientation in paraxial optical systems

Li, Dayan ; Kelly, Damien P. ; Kirner, Raoul ; Sheridan, John T. (Optical Society of America, 2012-02)

The statistical properties of speckles in paraxial optical systems depend on the system parameters. In particular, the speckle orientation and the lateral dependence (x and y) of the longitudinal speckle size can vary ...
Speckle photography : mixed domain fractional Fourier motion detection

Patten, Robert ; Hennelly, Bryan M. ; Kelly, Damien P. ; O'Neill, Feidhlim T. ; Liu, Ying ; Sheridan, John T. (Optical Society of America, 2006-01-01)

A reﬂection-based optical implementation of two simultaneous scale-invariant fractional Fourier transforms (FRTs) is used to develop a novel compact speckle photographic system. The system allows the independent determination ...
Spread-space spread-spectrum technique for secure multiplexing

Hennelly, Bryan M. ; Naughton, Thomas J. ; McDonald, John B. ; Sheridan, John T. ; Gopinathan, Unnikrishnan ; Kelly, Damien P. ; Javidi, Bahram (Optical Society of America, 2007-05-01)

A novel technique for multiplexing complex images is proposed in which each image may be demultiplexed only if a set of random encryption keys is known. The technique utilizes the ability of the double random phase encoding ...
Three-dimensional speckle size in generalized optical systems with limiting apertures

Ward, Jennifer E. ; Kelly, Damien P. ; Sheridan, John T. (Optical Society of America, 2009-08-01)

Correlation properties of speckle ﬁelds at the output of quadratic phase systems with hard square and circular apertures are examined. Using the linear canonical transform and ABCD ray matrix techniques to describe these ...
Three-dimensional static speckle fields: Part II Experimental investigation

Li, Dayan ; Kelly, Damien P. ; Sheridan, John T. (Optical Society of America, 2011-08-25)

In Part I [J. Opt. Soc. Am. A 28, 1896 (2011) of this paper, the physical model for fully developed speckle is examined based on two critical assumptions. (i) It is assumed that in the object plane, the speckle field is ...
Three-dimensional static speckle fields. Part II. Experimental investigation

Li, Dayan ; Kelly, Damien P. ; Sheridan, John T. (Optical Society of America, 2011-09-01)

In Part I [J. Opt. Soc. Am. A 28, 1896 (2011) of this paper, the physical model for fully developed speckle is examined based on two critical assumptions. (i) It is assumed that in the object plane, the speckle field is ...
Three-dimensional static speckle fields. Part I. Theory and numerical investigation

Li, Dayan ; Kelly, Damien P. ; Sheridan, John T. (Optical Society of America, 2011-09-01)

When monochromatic light is scattered from an optically rough surface a complicated three-dimensional (3D) field is generated. These fields are often described by reference to the 3D volume (extent) of their speckles, ...
Wavelength-controlled variable-order optical fractional Fourier transform

Hennelly, Bryan M. ; Kelly, Damien P. ; Sheridan, John T. (Optical Society of America, 2004-03-01)

The relationship between optical fractional Fourier transforms (OFRTs) obtained at different wavelengths is derived by use of the ABCD matrix formalism. It is shown that varying the wavelength while retaining the same ...