Implementation of a speckle-correlation-based optical lever with extended dynamic range.
TLDR
Two types of computer-automated SC-OptLevs, an open-source-based computing system with a low-cost image sensor and a commercial computing system, are presented with assistive computational modules.Abstract:
A speckle-correlation-based optical lever (SC-OptLev) is constructed for the measurement of small changes in the orientation angle of a surface. The dynamic range of SC-OptLev is found to be twice that of a conventional OptLev for the same experimental configurations. Different filtering mechanisms are implemented, and the correlation results are compared. Two types of computer-automated SC-OptLevs, an open-source-based computing system with a low-cost image sensor and a commercial computing system, are presented with assistive computational modules.read more
Citations
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Fresnel incoherent correlation holography with single camera shot
Anand Vijayakumar,Tomas Katkus,Stefan Lundgaard,Denver P. Linklater,Elena P. Ivanova,Soon Hock Ng,Saulius Juodkazis +6 more
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Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes
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Lensless Three-Dimensional Quantitative Phase Imaging Using Phase Retrieval Algorithm.
Vijayakumar Anand,Tomas Katkus,Denver P. Linklater,Elena P. Ivanova,Saulius Juodkazis,Saulius Juodkazis +5 more
TL;DR: This tutorial discusses one of the basic optical configurations of a lensless QPI technique based on the phase-retrieval algorithm andmented codes in Octave for image acquisition and automation using a web camera in an open source operating system are provided.
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Randomly Multiplexed Diffractive Lens and Axicon for Spatial and Spectral Imaging.
Vijayakumar Anand,Vijayakumar Anand,Tomas Katkus,Saulius Juodkazis,Saulius Juodkazis,Saulius Juodkazis +5 more
TL;DR: A new hybrid diffractive optical element (HDOE) was designed by randomly multiplexing an axicon and a Fresnel zone lens and generates two mutually coherent waves, namely a conical wave and a spherical wave, for every on-axis point object in the object space.
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Review of engineering techniques in chaotic coded aperture imagers
TL;DR: In this paper , the authors survey several recently proposed techniques to control the parameters of coded aperture imaging (CAI) by engineering the aperture of the system and present the prime architectures of these indirect methods of imaging.
References
More filters
Journal ArticleDOI
Phase-only matched filtering
TL;DR: This work examines the relationship between phase and amplitude in the case of alphanumeric characters, with and without noise, using a computer simulation and compares the phase-only and amplitude-only filters to the classical matched filter using the criteria of discrimination, correlation peak, and optical efficiency.
Journal ArticleDOI
An atomic-resolution atomic-force microscope implemented using an optical lever
S. Alexander,L. Hellemans,Othmar Marti,J. Schneir,V. Elings,Paul K. Hansma,Matt Longmire,J. Gurley +7 more
TL;DR: In this paper, the first atomic-resolution image of a surface obtained with an optical implementation of the atomic force microscope (AFM) was presented, where the native oxide on silicon was imaged with atomic resolution, and ≊5nm resolution images of aluminum, mechanically ground iron, and corroded stainless steel were obtained.
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Blind deconvolution by means of the Richardson-Lucy algorithm.
TL;DR: Its performance in the presence of noise is found to be superior to that of other blind deconvolution algorithms and the algorithm is developed further to incorporate functional forms of the point-spread function with unknown parameters.
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A laser-speckle strain gauge
TL;DR: In this paper, a noncontact and automatic method of measuring surface strain was developed, which makes use of the speckle displacement that is detected by cross correlating the signals from a photodiode array.
Journal ArticleDOI
Electronic speckle photography: increased accuracy by nonintegral pixel shifting.
TL;DR: The improved algorithm was found to determine displacement components with an uncertainty of less than 1% of a pixel and with negligible systematic errors in ideal experimental conditions.