Journal ArticleDOI
Noise reduction by continuous addition of subchannel holograms.
S.C. Som,C. J. Budhiraja +1 more
TLDR
A new and convenient technique for reducing both speckle and coherent noise in holographic imagery and its advantages and disadvantages have been mentioned in the context of other known techniques.Abstract:
A new and convenient technique for reducing both speckle and coherent noise in holographic imagery is described with supporting experimental results. Its advantages and disadvantages have been mentioned in the context of other known techniques.read more
Citations
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Patent
Voltage testing and measurement
Paul L. Pfaff,Kevin L. Russell +1 more
TL;DR: In this paper, a method of testing a device under test comprising providing a beam of light from a light source having a first wavelength was proposed, where the test device has a second state of refraction.
Patent
Method for testing a device under test including the interference of two beams
Paul L. Pfaff,Kevin L. Russell +1 more
TL;DR: In this paper, a method of testing a device under test includes providing a beam of coherent light from a light source having a first wavelength, and imposing the beam of light on a test device over a spatial region within the test device substantially greater than the first wavelength.
Patent
Holographic condition assessment system for a structure including a semiconductor material
TL;DR: An improved condition testing system and method integrated into microelectronic circuits as discussed by the authors includes a structure including a semiconductor material with a target portion and a second portion for determining the presence and nature of various external (e.g. magnetic field, microwave, bioelectric or incident radiation) or internal stresses (i.e. binary circuit-state or analog signal recognition) or conditions acting upon the material.
Journal ArticleDOI
Precision coordinate measurements using holographic recording
TL;DR: In this article, the authors discuss the techniques of in-line and off-axis holography, and the problems that are encountered in practice, focusing on precision three-dimensional coordinate measurements from holographic images.
Patent
Non-destructive testing system using a laser beam
Paul Pfaff,Michael Mauck +1 more
TL;DR: In this paper, a noninvasive testing system using a method of testing a device under test by providing a beam of light from a light source having a first wavelength, and in a second beam instance imposing the light on a test device when the test device has a second state of refractive indexes, was presented.
References
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Journal ArticleDOI
Elimination of speckle noise in holograms with redundancy
TL;DR: This paper described a multibeam recording technique that produces redundant holograms that yield speckle free images of transparencies and shows that, in order to obtain an acceptably high signal-to-noise ratio, the area of this type hologram must be more than 100 times the area needed to achieve a desired image resolution.
Journal ArticleDOI
Laser speckle and its elimination
TL;DR: In this paper, the authors describe a speckle that arises from the uneven illumination of an object with a multiplicity of waves that interfere at its surface, i.e., uneven illumination caused by uneven illumination.
Journal ArticleDOI
Holographic reconstruction without granulation
W. Martienssen,S. Spiller +1 more
TL;DR: In this article, high resolution reconstructions without granulation can be obtained by superimposing reconstructions of a large number of differently illuminated holograms of the same object without granulating them.
Journal ArticleDOI
Speckle Reduction in Holography by Means of Random Spatial Sampling
Francis T. S. Yu,E. Y. Wang +1 more
TL;DR: A new technique by which the hologram image speckle can be reduced by spatially random sampling of the holographic aperture by means of a movable random mask.
Journal ArticleDOI
Speckle reduction by simulation of partially coherent object illumination in holography.
TL;DR: In this paper, a mask is placed in the plane, conjugate to the plane containing the plurality of object-illuminating sources, and an aperture in this mask is then moved to take positions to transmit only the light from one of the illuminating points at a time and to block the other points.