Multiview phase shifting: a full-resolution and high-speed 3D measurement framework for arbitrary shape dynamic objects

2013 ◽  
Vol 38 (9) ◽  
pp. 1389 ◽  
Author(s):  
Zhongwei Li ◽  
Kai Zhong ◽  
Y. F. Li ◽  
Xiaohui Zhou ◽  
Yusheng Shi
Keyword(s):  
Arbitrary Shape ◽  
High Speed ◽  
Phase Shifting ◽  
3D Measurement ◽  
Full Resolution ◽  
Measurement Framework ◽  
Dynamic Objects

scholarly journals High-speed triangular pattern phase-shifting 3D measurement based on the motion blur method

2017 ◽  
Vol 25 (8) ◽  
pp. 9171 ◽  
Author(s):  
Huijie Zhao ◽  
Xiaochun Diao ◽  
Hongzhi Jiang ◽  
Xudong Li
Keyword(s):  
High Speed ◽  
Motion Blur ◽  
Phase Shifting ◽  
3D Measurement

scholarly journals A micromirror array with annular partitioning for high-speed random-access axial focusing

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Nathan Tessema Ersumo ◽  
Cem Yalcin ◽  
Nick Antipa ◽  
Nicolas Pégard ◽  
Laura Waller ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Visual Information ◽  
High Speed ◽  
Random Access ◽  
General Purpose ◽  
Phase Shifting ◽  
Optical Systems ◽  
Piston Motion ◽  
Refresh Rate ◽  
Circular Symmetry

Abstract Dynamic axial focusing functionality has recently experienced widespread incorporation in microscopy, augmented/virtual reality (AR/VR), adaptive optics and material processing. However, the limitations of existing varifocal tools continue to beset the performance capabilities and operating overhead of the optical systems that mobilize such functionality. The varifocal tools that are the least burdensome to operate (e.g. liquid crystal, elastomeric or optofluidic lenses) suffer from low (≈100 Hz) refresh rates. Conversely, the fastest devices sacrifice either critical capabilities such as their dwelling capacity (e.g. acoustic gradient lenses or monolithic micromechanical mirrors) or low operating overhead (e.g. deformable mirrors). Here, we present a general-purpose random-access axial focusing device that bridges these previously conflicting features of high speed, dwelling capacity and lightweight drive by employing low-rigidity micromirrors that exploit the robustness of defocusing phase profiles. Geometrically, the device consists of an 8.2 mm diameter array of piston-motion and 48-μm-pitch micromirror pixels that provide 2π phase shifting for wavelengths shorter than 1100 nm with 10–90% settling in 64.8 μs (i.e., 15.44 kHz refresh rate). The pixels are electrically partitioned into 32 rings for a driving scheme that enables phase-wrapped operation with circular symmetry and requires <30 V per channel. Optical experiments demonstrated the array’s wide focusing range with a measured ability to target 29 distinct resolvable depth planes. Overall, the features of the proposed array offer the potential for compact, straightforward methods of tackling bottlenecked applications, including high-throughput single-cell targeting in neurobiology and the delivery of dense 3D visual information in AR/VR.

Phase Algorithm Integrating Direct-Correlation and Four-Step Phase-Shifting for Electronic Speckle Pattern Interferometry

2013 ◽  
Vol 448-453 ◽  
pp. 3696-3701
Author(s):  
Yan Bin He ◽  
Xin Zhong Li ◽  
Min Zhou
Keyword(s):  
High Speed ◽  
Speckle Pattern ◽  
Phase Shifting ◽  
Electronic Speckle Pattern Interferometry ◽  
High Speed Camera ◽  
Dynamic Measurements ◽  
High Quality ◽  
Correlation Algorithm ◽  
Phase Map

A phase-shifting algorithm, called a (4,4) algorithm, which takes four phase-shifting interferograms before a specimen is deformed and four interferograms after a specimen is deformed, is presented first. This method is most widely used for phase extraction. Its drawback limited it to be used in dynamic measurements. Also shown is an algorithm called a (4,1) algorithm that takes four phase-shifting interferograms before a specimen is deformed and one interferogram after a specimen is deformed. Because a high-speed camera can be used to record the dynamic interferogram of the specimen, this algorithm has the potential to retain the phase-shifting capability for ESPI in dynamic measurements. The quality of the phase map obtained using (4,1) algorithm is quite lower compared to using (4,4) algorithm. In order to obtain high-quality phase map in dynamic measurements, a direct-correlation algorithm was integrated with the (4,1) algorithm to form DC-(4,1) algorithm which is shown to improve significantly the quality of the phase maps. The theoretical and experimental aspects of this newly developed technique, which can extend ESPI to areas such as high-speed dynamic measurements, are examined in detail.

Phase-shifting algorithm to achieve high-speed long-depth-range probing by frequency-domain optical coherence tomography

2003 ◽  
Vol 28 (22) ◽  
pp. 2201 ◽  
Author(s):  
Rainer A. Leitgeb ◽  
Christoph K. Hitzenberger ◽  
Adolf F. Fercher ◽  
Tomasz Bajraszewski
Keyword(s):  
Optical Coherence Tomography ◽  
Frequency Domain ◽  
High Speed ◽  
Phase Shifting ◽  
Depth Range ◽  
Optical Coherence

scholarly journals High Speed 3D Shape Measurement with Temporal Fourier Transform Profilometry

2019 ◽  
Vol 9 (19) ◽  
pp. 4123 ◽  
Author(s):  
Haihua Zhang ◽  
Qican Zhang ◽  
Yong Li ◽  
Yihang Liu
Keyword(s):  
Fourier Transform ◽  
High Speed ◽  
Shape Measurement ◽  
Measurement Technology ◽  
Reconstruction Process ◽  
Measured Object ◽  
3D Shape ◽  
3D Shape Measurement ◽  
Fourier Transform Profilometry ◽  
Dynamic Objects

A novel high-speed 3D shape measurement technology called temporal Fourier transform profilometry (TFTP for short) is proposed by combining the merits of Fourier transform profilometry (FTP) and phase-measuring profilometry (PMP). Instead of using the digital light projector, a mechanical projector is employed to generate multi-period phase-shifting fringe patterns sequentially. During the reconstruction process, the phase value of each pixel is calculated independently along the temporal axis and no spectrum filtering operation is performed in a spatial domain. Therefore, high-frequency components containing the detailed information of the measured object effectively remain. The proposed method is suitable for measuring isolated dynamic objects. Only one frame of deformed fringe pattern is required to retrieve one 3D shape of the measured object, so it has the obvious advantage if measuring the dynamic scene at a high speed. A low-cost self-made mechanical projector with fast projection speed is developed to execute the principle-proof experiments, whose results demonstrate the feasibility of measuring isolated dynamic objects.

A Comparison of Two Collision Detection Libraries in a Haptic Simulation Environment

2004 ◽  
Author(s):  
Adam S. Coutee ◽  
Bert Bras
Keyword(s):  
Virtual Environment ◽  
Collision Detection ◽  
High Speed ◽  
Limiting Factors ◽  
Simulation Environment ◽  
Assembly Sequences ◽  
High Speed Collision ◽  
Dynamic Objects ◽  
Haptic Simulation

Modeling the interaction between dynamic objects in a haptically enabled virtual environment requires high-speed collision detection. We present an independent comparison of two publicly available collision detection libraries, V-Clip and SWIFT++, as they perform in our assembly and disassembly simulation. Three assembly sequences, differing only by the complexity of the objects involved, are tested and compared based on speed of execution. In the process, some potentially limiting factors experienced while using these libraries are exposed.

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