Results 291 to 300 of about 8,935,486 (331)

Dynamic phase-shifting photoelasticity

Applied Optics, 2001
The application of phase-shifting photoelasticity to a real-time dynamic event involves simultaneous recording of the four phase-shifted images. Here an instrument, believed to be novel, is developed and described for this purpose. Use of a Multispec Imager is introduced into digital photoelasticity for the first time to our knowledge.
A, Asundi, L, Tong, C G, Boay
openaire   +2 more sources

Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control

IEEE transactions on industry applications, 2018
As key component for the flexible dc distributed power system, the dual active bridge (DAB)-converter-based solid-state transformer (SST) with high efficiency for a wide operating range is essential.
Haochen Shi, H. Wen, Jie Chen, Yihua Hu, Lin Jiang, Guipeng Chen, Jieming Ma   +6 more
semanticscholar   +1 more source

Dynamic Photoinduced Controlling of the Large Phase Shift of Terahertz Waves via Vanadium Dioxide Coupling Nanostructures

ACS Photonics, 2018
Utilizing terahertz (THz) waves to transmit data for communication and imaging places high demands on phase modulation. However, until now, it is difficult to realize a more than 100° phase shift in the transmission mode with one-layer structure. In this
Yuncheng Zhao, Yaxin Zhang, Qiwu Shi, S. Liang, Wanxia Huang, Wei Kou, Ziqiang Yang   +6 more
semanticscholar   +1 more source

Phase-shift coherence holography

Optics Letters, 2010
We propose and experimentally demonstrate a new reconstruction scheme for coherence holography using computer-generated phase-shift coherence holograms. A 3D object encoded into the spatial coherence function is reconstructed directly from a set of incoherently illuminated computer-generated holograms with numerically introduced phase shifts.
Dinesh N, Naik, Takahiro, Ezawa, Yoko, Miyamoto, Mitsuo, Takeda   +3 more
openaire   +2 more sources

Multiple-Phase-Shift Control for a Dual Active Bridge to Secure Zero-Voltage Switching and Enhance Light-Load Performance

IEEE transactions on power electronics, 2018
An ac/dc + dual active bridge (DAB) circuit was found as one solution for the high-efficiency and high-power-density electric vehicle charger. One control option is to let the ac/dc part only convert the grid voltage to a double-line-frequency folded ...
A. Taylor, Guanliang Liu, Hua Bai, Alan Brown, P. Johnson, Matt Mcammond   +5 more
semanticscholar   +1 more source

Parallel phase-shifting color digital holography using two phase shifts

Applied Optics, 2009
We propose parallel phase-shifting color digital holography using two phase shifts. This technique enables the instantaneous acquisition of three-dimensional information of a moving color object. The interference fringe image that contains six holograms with two phase shifts for three wavelengths is recorded by a single shot exposure.
Takashi, Kakue, Tatsuki, Tahara, Kenichi, Ito, Yuki, Shimozato, Yasuhiro, Awatsuji, Kenzo, Nishio, Shogo, Ura, Toshihiro, Kubota, Osamu, Matoba   +8 more
openaire   +2 more sources

Phase shift selection for two-step generalized phase-shifting interferometry

Applied Optics, 2011
A phase shift selection method is proposed to design algorithms immune against phase shift errors in two-step generalized phase-shifting interferometry. A general formula for wavefront reconstruction error is derived, and its specific expressions for two common errors are also given.
Xiangfeng, Xu, Luzhong, Cai, Hongguang, Yuan, Qian, Zhang, Guangcan, Lu, Chu, Wang   +5 more
openaire   +2 more sources

Accurate Phase Shift Extraction for Generalized Phase-Shifting Interferometry

Chinese Physics Letters, 2010
An accurate phase shift extraction method for generalized phase-shifting interferometry is suggested. Based on the nearly random phase distribution of the diffraction field of the object, a singular formula is derived to calculate the unknown phase shift without the requirements of an iteration process or the selection of the correct value from two or ...
Xu Xian-Feng, Cai Lu-Zhong, Wang Yu-Rong, Li Dai-Lin   +3 more
openaire   +1 more source

Phase shifting for nonsinusoidal waveforms with phase-shift errors

Journal of the Optical Society of America A, 1995
In phase measurement systems that use phase shifting techniques, phase errors that are due to nonsinusoidal waveforms can be minimized by applying synchronous phase shifting algorithms with more than four samples. However, when the phase shift calibration is inaccurate, these algorithms cannot eliminate the effects of nonsinusoidal characteristics.
K. Hibino, K.G. Larkin, B. F. Oreb, D. I. Farrant   +3 more
openaire   +1 more source

Embedded phase shifting: Robust phase shifting with embedded signals

2015 IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2015
We introduce Embedded PS, a new robust and accurate phase shifting algorithm for 3D scanning. The method projects only high frequency sinusoidal patterns in order to reduce errors due to global illumination effects, such as subsurface scattering and interreflections.
Daniel Moreno, Kilho Son, Gabriel Taubin
openaire   +1 more source