Three-dimensional optical metrology with extended depth-measuring range using a holographic axilens

Hasman, Erez; Kleiner, Vladimir

doi:10.1117/1.1524170

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…DOEs are commonly designed to transform an incident light wavefront into a desired light pattern. Recently, Hasman and Kleiner developed a method for 3-D optical metrology using a Lee type binary mask (a binary DOE) which encodes an axilens 9 . Because of its circular support, a conventional axilens produces a long depth of focus with a nearly constant intensity 10 .…”

Section: Introductionmentioning

confidence: 99%

Programmable pixelated lens with long depth of focus for shape recovering applications

2006

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We show that long depth of focus can be achieved with a pixelated lens (PL) encoded onto a reconfigurable spatial light modulator (SLM). Our PL has a phase distribution similar to that of a conventional axilens. Additionally, our resulting reconfigurable PL is employed in a novel shape recovering system. A feature of this system is that no moving parts or motors are required to scan a three-dimensional object. Numerical simulations and experimental results are shown.

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Section: Introductionmentioning

confidence: 99%

Programmable pixelated lens with long depth of focus for shape recovering applications

2006

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“…The measurement of surface contour information is an especially difficult problem in machine vision systems since depth information is often lost or difficult to interpret. Currently many efforts are directed to development of 3D-vision systems, which use the structured light triangulation method [1,2]. However, speed of such systems is not very high and limited by the time of image acquisition and processing.…”

Section: Introductionmentioning

confidence: 99%

<title>Surface profile acquisition using dynamic speckles</title>

Semenov

Nippolainen

Raita³

et al. 2006

SPIE Proceedings

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In this work we present the novel technique for z-distance measurement to an optically rough surface using dynamic speckles. The technique is based on the continuous frequency measurements ofthe power modulation ofthe spatially filtered scattered light. The dynamic speckle pattern is created when the laser beam scans the surface under study. The complete optical-electronic system was designed and fabricated for fast measurement of the speckles velocity, its recalculation into the distance, and further data acquisition into computer. The measured surface profile is displayed in a PC monitor in real time. Main advantage of the proposed technique is high scanning speed providing an extremely short response time below 1 js. Important parameters of the system such as accuracy, range of measurements, and spatial resolution are analyzed. Limits of the spatial filtering technique used for continuous tracking ofthe speckle-pattern velocity are shown. Possible ways of further improvement of the measurements accuracy are demonstrated. Due to its extremely fast operation the proposed technique could fmd applications in such areas as online quality control of materials (paper thickness, rolled metal roughness, etc.) moving on production lines with high velocities (up to 20 mIs) or online control of the 3D-shape of complex objects (e.g., electronic circuits) during their assembling.

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“…The researchers noted that further artificial expansion of the beam focal length could cause significant weakening of its axial intensity. The probe depth could be increased by 60 mm without decreasing the lateral resolution, which was 0.6 μm, by using a holographic axilens in an optical profilometer system [57].…”

mentioning

confidence: 99%

Optical coherence tomography (Review)

Краморева

Rozhko

2010

J Appl Spectrosc

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535.423+617.7The basic principles and possibilities of optical coherence tomography (OCT) as a method for the investigation of pathologies in medical diagnostics are outlined. We discuss the OCT method limitations and issues related to the need for improving the resolution of optical tomographs. The prospects are considered for developing the OCT methods based on probing with diffraction-free light beams.

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Three-dimensional optical metrology with extended depth-measuring range using a holographic axilens

Cited by 4 publications

References 13 publications

Programmable pixelated lens with long depth of focus for shape recovering applications

Programmable pixelated lens with long depth of focus for shape recovering applications

<title>Surface profile acquisition using dynamic speckles</title>

Optical coherence tomography (Review)

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