Projected fringe profilometry using a hologram for objects with large depth discontinuities

2006 ◽  
Author(s):  
Wei-Hung Su ◽  
Wei-Jen Chen ◽  
Jun-Shan Huang ◽  
Cho-Yo Kuo
Keyword(s):  
Large Depth ◽  
Depth Discontinuities

Multi-frequency projected fringe profilometry for measuring objects with large depth discontinuities

2013 ◽  
Vol 288 ◽  
pp. 27-30 ◽  
Author(s):  
Yong Xu ◽  
Shuhai Jia ◽  
Xing Luo ◽  
Jia Yang ◽  
Ye Zhang
Keyword(s):  
Large Depth ◽  
Depth Discontinuities

scholarly journals Phase-Shifting Projected Fringe Profilometry Using Binary-Encoded Patterns

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 362
Author(s):  
Nai-Jen Cheng ◽  
Wei-Hung Su
Keyword(s):  
Phase Unwrapping ◽  
Phase Shifting ◽  
Phase Extraction ◽  
Fringe Order ◽  
Surface Color ◽  
Large Depth ◽  
Phase Shifting Technique ◽  
Depth Discontinuities ◽  
Fringe Patterns

A phase unwrapping method for phase-shifting projected fringe profilometry is presented. It did not require additional projections to identify the fringe orders. The pattern used for the phase extraction could be used for phase unwrapping directly. By spatially encoding the fringe patterns that were used to perform the phase-shifting technique with binary contrasts, fringe orders could be discerned. For spatially isolated objects or surfaces with large depth discontinuities, unwrapping could be identified without ambiguity. Even though the surface color or reflectivity varied periodically with position, it distinguished the fringe order very well.

Boron-Nitrogen Doped Dihydroindeno[1,2-b]fluorene Derivatives as Acceptors in Organic Solar Cells

2019 ◽  
Author(s):  
Matthew Morgan ◽  
Maryam Nazari ◽  
Thomas Pickl ◽  
J. Mikko Rautiainen ◽  
Heikki M. Tuononen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Organic Solar Cells ◽  
Organic Solar Cell ◽  
Broad Absorption ◽  
Nitrogen Doped ◽  
Large Depth ◽  
End Products ◽  
Boron Nitrogen ◽  
The Way

The electrophilic borylation of 2,5-diarylpyrazines results in the formation of boron-nitrogen doped dihydroindeno[1,2-<i>b</i>]fluorene which can be synthesized via mildly air-sensitive techniques and the end products handled readily under atmosphereic conditions. Through transmetallation via diarylzinc reagents a series of derivatives were sythesized which show broad absorption profiles that highlight the versatility of this backbone to be used in organic solar cell devices. These compounds can be synthesized in large yields, in alow number of steps and functionalized at many stages along the way providing a large depth of possibilities. Exploratory device paramaters were studied and show PCE of 2%.

scholarly journals Locating and Imaging through Scattering Medium in a Large Depth

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 90
Author(s):  
Shuo Zhu ◽  
Enlai Guo ◽  
Qianying Cui ◽  
Lianfa Bai ◽  
Jing Han ◽  
...  
Keyword(s):  
Phase Space ◽  
Signal To Noise Ratio ◽  
Speckle Pattern ◽  
Heuristic Method ◽  
Scattering Medium ◽  
Scattering Media ◽  
Signal To Noise ◽  
Practical Applications ◽  
Large Depth ◽  
Strong Scattering

Scattering medium brings great difficulties to locate and reconstruct objects especially when the objects are distributed in different positions. In this paper, a novel physics and learning-heuristic method is presented to locate and image the object through a strong scattering medium. A novel physics-informed framework, named DINet, is constructed to predict the depth and the image of the hidden object from the captured speckle pattern. With the phase-space constraint and the efficient network structure, the proposed method enables to locate the object with a depth mean error less than 0.05 mm, and image the object with an average peak signal-to-noise ratio (PSNR) above 24 dB, ranging from 350 mm to 1150 mm. The constructed DINet firstly solves the problem of quantitative locating and imaging via a single speckle pattern in a large depth. Comparing with the traditional methods, it paves the way to the practical applications requiring multi-physics through scattering media.

Effects on Performance of Variable Eccentric Loads during Depth Jumps

1995 ◽  
Vol 4 (1) ◽  
pp. 31-41 ◽  
Author(s):  
James C. Radcliffe ◽  
Louis R. Osternig
Keyword(s):  
Body Weight ◽  
Small Proportion ◽  
Small Amplitude ◽  
Vertical Jump ◽  
Considerable Variability ◽  
Large Depth ◽  
Jumping Performance ◽  
Squat Exercise ◽  
Healing Tissue ◽  
Extreme Care

Seventy subjects were tested for (a) percent body weight controlled (lowered and raised) by the lower extremities via parallel squat exercise, (b) maximum vertical jump-reach, and (c) maximal depth jump-reach from six heights ranging from 0.30 to 1.05 m. The results suggest that maximum parallel squat performance represents a small proportion (8%) of the variance contributing to controlling increasing depth jump heights and that specific improvement in jumping performance may be achieved by relatively small amplitude prestretch movements rather than large depth jump heights. The implications of the present findings for the use of depth jumping in conditioning and rehabilitative protocols are that (a) extreme care must be exercised in selecting jump heights, as there is considerable variability in individual tolerance to a given height, and (b) depth jumping should be contraindicated in cases where high impulse loads can disrupt healing tissue and, if it is used in postinjury situations, should be reserved for the end phase of rehabilitation.

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