Characterization of microvibrations by speckle interferometry

1995 ◽  
Author(s):  
Roland Hoefling ◽  
Volkmar Liebig ◽  
Claus-Dieter Schmidt
Keyword(s):  
Speckle Interferometry

Microdamage in Composite Laminates: Experiments and Observation

2014 ◽  
Vol 518 ◽  
pp. 84-89
Author(s):  
Janis Varna ◽  
Leif Asp
Keyword(s):  
Composite Laminates ◽  
Speckle Interferometry ◽  
Damage State ◽  
Axis Orientation ◽  
Fiber Reinforced Composite ◽  
X Ray ◽  
Reinforced Composite ◽  
Loading Direction ◽  
Intralaminar Cracking

The first mode of damage in fiber reinforced composite laminates is usually intralaminar cracking in layers with off-axis orientation regarding the main loading direction. This papers analyzes the most typical methods used for the characterization of the damage state: edge replicas, optical microscopy, x-ray images, acoustic emission, speckle interferometry and Raman spectroscopy

Characterization of ‘green’ composite laminates after flexural tests by speckle interferometry

2020 ◽  
Vol 59 (10) ◽  
pp. 1
Author(s):  
Pietro Russo ◽  
Vito Pagliarulo ◽  
Vittorio Bianco ◽  
Giorgio Simeoli ◽  
Francesca Cimino ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Speckle Interferometry ◽  
Green Composite ◽  
Flexural Tests

Application of speckle interferometry to the mechanical characterization of a biopolymer sample

2020 ◽  
Vol 59 (13) ◽  
pp. D148 ◽  
Author(s):  
Gustavo A. Gómez-Méndez ◽  
Amalia Martínez-García ◽  
Juan Antonio Rayas ◽  
Alexander Gaitán
Keyword(s):  
Mechanical Characterization ◽  
Speckle Interferometry

Characterization of bones by speckle interferometry

2003 ◽  
Vol 27 (2) ◽  
pp. 49-53 ◽  
Author(s):  
J. Horta ◽  
W. Brostow ◽  
G. Martinez ◽  
V. M. Castano
Keyword(s):  
Speckle Interferometry

scholarly journals Twin High-Resolution, High-Speed Imagers for the Gemini Telescopes: Instrument Description and Science Verification Results

2021 ◽  
Vol 8 ◽  
Author(s):  
Nicholas J. Scott ◽  
Steve B. Howell ◽  
Crystal L. Gnilka ◽  
Andrew W. Stephens ◽  
Ricardo Salinas ◽  
...  
Keyword(s):  
High Speed ◽  
Position Angle ◽  
Speckle Interferometry ◽  
Field Of View ◽  
Wide Field ◽  
Standard Data ◽  
Dual Channel ◽  
Host Stars ◽  
Pixel Scale

Two new imaging instruments, ‘Alopeke and Zorro, were designed, built, and commissioned at the Gemini-North and Gemini-South telescopes in 2018 and 2019, respectively. Here we describe them and present the results from over a year of operation. The two identical instruments are based on the legacy of the DSSI (Differential Speckle Survey Instrument) instrument, successfully used for years at the WIYN and the Gemini telescopes in Hawaii and Chile. ‘Alopeke and Zorro are dual-channel imagers having both speckle (6.7″) and “wide-field” (∼1 arcminute) field-of-view options. They were built to primarily perform speckle interferometry providing diffraction-limited imagery at optical wavebands, yielding pixel scale uncertainties of ±0.21 mas, position angle uncertainties of ±0.7◦, and photometric uncertainties of Δm ± 0.02–0.04 magnitudes (for the blue and red channels, respectively) when run through the standard data reduction pipeline. One of their main scientific roles is the validation and characterization of exoplanets and their host stars as discovered by transit surveys such as the NASA Kepler, K2, and TESS missions. The limiting magnitude for speckle observations at Gemini can be quite faint (r ∼18 in good observing conditions) but typically the observed targets are brighter. The instruments can also function as conventional CCD imagers providing a 1 arc-minute field of view and allowing simultaneous two-color, high-speed time-series operation. These resident visitor instruments are remotely operable and are available for use by the community via the peer-reviewed proposal process.

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