Results 71 to 80 of about 16,467 (243)

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Lensless multi-spectral holographic interferometry for optical inspection

Frontiers in Photonics
We explore the principles, implementation details, and performance characteristics of a lensless multi-spectral digital holographic sensor and demonstrate its potential for quality assurance in semiconductor manufacturing.
Mostafa Agour, Mostafa Agour, Fabian Thiemicke, André F. Müller, Ralf B. Bergmann, Ralf B. Bergmann, Claas Falldorf   +6 more
doaj   +1 more source

Beam-modulation methods in quantitative and flow visualization holographic interferometry [PDF]

This report discusses heterodyne holographic interferometry and time-average holography with a frequency shifted reference beam. Both methods will be used for the measurement and visualization of internal transonic flows, where the target facility is a ...
Decker, A.
core   +1 more source

Full field phase imaging using a harmonically matched diffraction grating pair based homodyne quadrature interferometer [PDF]

, 2007
In this letter, the authors present a novel quadrature interferometry method based on the use of a harmonically matched shallow grating pair. Unlike a simple beam splitter or single shallow grating, the grating pair can confer a nontrivial interference ...
Cui, Xiquan, Heng, Xin, Lee, Lap Man, Wu, Jigang, Yang, Changhuei, Yaqoob, Zahid   +5 more
core   +1 more source

Multiple Reflections on Huygens' Principle

Geophysical Prospecting, Volume 73, Issue 6, July 2025.
ABSTRACT According to Huygens' principle, all points on a wave front act as secondary sources emitting spherical waves and the envelope of these spherical waves forms a new wave front. In the mathematical formulation of Huygens' principle, the waves emitted by the secondary sources are represented by Green's functions.
Kees Wapenaar
wiley   +1 more source

Coherent microscopy and optical coherence tomography for biomedical applications [PDF]

, 2011
This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece.
3rd Micro and Nano Flows Conference (MNF2011), Coupland, JM   +1 more
core  

Investigating tricalcium silicate dissolution kinetics in cementitious materials through single‐particle analysis

Journal of the American Ceramic Society, Volume 108, Issue 7, July 2025.
Abstract The dissolution kinetics of tricalcium silicate (Ca3SiO5, or C3S), the primary component of ordinary Portland cement, are critical to cement hydration, which governs key properties, such as setting, hardening, long‐term mechanical performance, and durability.
Ziyu Chen, Yanming Liu, Hao Sui, Felipe Basquiroto de Souza, Kwesi Sagoe‐Crentsil, Adrian Neild, Wenhui Duan   +6 more
wiley   +1 more source

Diffraction from deformed volume holograms: perturbation theory approach [PDF]

, 2005
We derive the response of a volume grating to arbitrary small deformations, using a perturbative approach. This result is of interest for two applications: (a) when a deformation is undesirable and one seeks to minimize the diffracted field's sensitivity
Barbastathis, George, Cuingnet, Thomas, Li, Zhenyu, Liu, Wenhai, Psaltis, Demetri, Tian, Kehan   +5 more
core   +1 more source

Separate reference beam holographic interferometry and its application to the measurement of small phase variations in sub-fringe systems [PDF]

Application of separate reference beam holographic interferometry for measurement of small phase variations in sub-fringe ...
Testerman, M. K.
core   +1 more source

Theoretical analysis of intensity distribution in diffraction of light by ultrasound in the case of holographic interferometry

Archives of Acoustics, 2016
The theoretical background for optical holographic interferometry used in ultrasonic field investigations is presented. The double-exposure pulse technique, the time averaged technique, and also the stroboscopic real time technique are considered ...
Piotr KWIEK, Antoni ŚLIWIŃSKI
doaj