Multi-Measurement Correlations in the Near-Field of a Complex Supersoinc Jet Using Time-Resolved Schlieren Imaging

2017 ◽  
Author(s):  
Andrew S. Tenney ◽  
Thomas J. Coleman ◽  
Jacques Lewalle ◽  
Mark N. Glauser ◽  
Sivaram P. Gogineni
Keyword(s):  
Near Field ◽  
Schlieren Imaging ◽  
Time Resolved

scholarly journals Time-resolved terahertz time-domain near-field microscopy

2018 ◽  
Vol 26 (24) ◽  
pp. 32118 ◽  
Author(s):  
N. J. J. van Hoof ◽  
S. E. T. ter Huurne ◽  
J. Gómez Rivas ◽  
A. Halpin
Keyword(s):  
Time Domain ◽  
Near Field ◽  
Time Resolved

Investigations on Phonon-Assisted Relaxation Mechanisms in CdSe/ZnSe Quantum Islands Using Time-Resolved Near-Field Spectroscopy

2002 ◽  
Vol 190 (2) ◽  
pp. 533-536 ◽  
Author(s):  
B. Dal Don ◽  
R. Dianoux ◽  
S. Wachter ◽  
E. Kurtz ◽  
G. von Freymann ◽  
...  
Keyword(s):  
Near Field ◽  
Time Resolved ◽  
Field Spectroscopy

Plasmon Dephasing in Single Gold Nanorods Observed By Ultrafast Time-Resolved Near-Field Optical Microscopy

2015 ◽  
Vol 119 (28) ◽  
pp. 16215-16222 ◽  
Author(s):  
Yoshio Nishiyama ◽  
Keisuke Imaeda ◽  
Kohei Imura ◽  
Hiromi Okamoto
Keyword(s):  
Optical Microscopy ◽  
Gold Nanorods ◽  
Near Field ◽  
Time Resolved

Flow Phenomena and Time Resolved Concentration Measurements in an Axial Flow Mixer

2002 ◽  
Author(s):  
Jared E. Campbell ◽  
Richard W. Coppom
Keyword(s):  
Near Field ◽  
Velocity Ratio ◽  
Axial Flow ◽  
Recent Theory ◽  
Flow Loop ◽  
Time Resolved ◽  
Concentration Variance ◽  
Jet Breakup ◽  
Flow Phenomena ◽  
Concentration Measurements

Experiments were conducted to better understand the flow physics associated with axial flow mixers in pipes. Specifically, the dependence of the downstream mixing evolution on the velocity ratio of the secondary to primary stream was explored. Experiments were conducted in a 25.4 mm diameter water pipe flow loop (25,700 ≤ RD ≤ 28,500), in which a fluorescein dye was coaxially injected. The injection tube diameter was 1.5 mm. Three velocity ratios, VR = 0.5, 1.0 and 2.0 were explored, where VR = Vjet/Vmain. The present results indicate that the effects of velocity ratio on the mean concentration are primarily evident in the near-field flow downstream of the injector, while concentration variance measurements indicate a primary influence at intermediate axial locations. Analysis of higher order moments and flow visualizations suggest that these influences are associated with the injected flow conditions. Two-dimensional LIF analysis of the coherent jet breakup region showed an instability in this transition related to injector flow Reynolds number. The present concentration measurements do not indicate the exponential variance decay commonly used for modelling mixing in pipes. Far field data exhibit low wavenumber motions as predicted by the recent theory of Guilkey et al. (1997).

Time Resolved Near Field (TRNF) diagnostic four-frame nanosecond gated hybrid CMOS image sensor

2019 ◽  
Author(s):  
Emily R. Hurd ◽  
Tyler Tate ◽  
Matthew S. Dayton ◽  
Liam D. Claus ◽  
Cassandra E. Durand ◽  
...  
Keyword(s):  
Near Field ◽  
Cmos Image Sensor ◽  
Image Sensor ◽  
Time Resolved ◽  
Hybrid Cmos

Sub-nanosecond time-resolved near-field scanning magneto-optical microscope

2015 ◽  
Vol 86 (2) ◽  
pp. 023703 ◽  
Author(s):  
J. Rudge ◽  
H. Xu ◽  
J. Kolthammer ◽  
Y. K. Hong ◽  
B. C. Choi
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Time Resolved ◽  
Near Field Scanning

Femtosecond Time-Resolved Near-Field Spectroscopy of CdSe Nanocluster Films

1999 ◽  
Vol 16 (9) ◽  
pp. 683-685 ◽  
Author(s):  
Hong Yan ◽  
Wei Qian ◽  
Yu-jun Deng ◽  
Zong-ju Xia ◽  
Ying-hua Zou ◽  
...  
Keyword(s):  
Near Field ◽  
Time Resolved ◽  
Field Spectroscopy

scholarly journals High Power THz Generation from Sub-ps Bunches of Relativistic Electrons

2004 ◽  
Vol 850 ◽  
Author(s):  
S. Benson ◽  
D. R. Douglas ◽  
H. F. Dylla ◽  
J. Gubeli ◽  
K. Jordan ◽  
...  
Keyword(s):  
High Power ◽  
Near Field ◽  
Fourth Power ◽  
Thz Spectroscopy ◽  
Relativistic Electrons ◽  
Time Resolved ◽  
Picosecond Pulses ◽  
Coulomb Term ◽  
Joseph Larmor ◽  
New Generation

ABSTRACTWe describe a > 100 Watt broadband THz source that takes advantage of the relativistic enhancement of the radiation from accelerating electrons according to the formula assigned the name of Sir Joseph Larmor[1, 2]. This is in contrast to the typical 1 milliwatt sources available in a laboratory. Specifically, for relativistic electrons the emission is enhanced by the fourth power of the increase in mass. Thus for 100 MeV electrons, for which the mass increases by a factor of ∼ 200, the enhancement is > 109. The experiments use a new generation of light source called an energy recovery linac (ERL) [3], in which bunches of electrons circulate once, but in which their energy is recovered. In such a machine the electron bunches can be very much shorter than those, say, in storage rings or synchrotrons.The Jefferson Lab facility operates in new limits of emission from relativistic particles involving both multiparticle coherence and near-field emission in which the velocity (Coulomb) term in the classical electrodynamical theory becomes as important as the acceleration term (synchrotron radiation).The sub-picosecond pulses of light offer unique capabilities in 2 specific areas, namely time-resolved dynamics, and imaging. High resolution THz spectroscopy has recently revealed sharp vibrational modes for many materials including malignant tissue, proteins, DNA, pharmaceuticals and explosive materials. Energetically the THz range embraces superconducting bandgaps, and regions of intense interest in the understanding of systems in which correlated motions of electrons are important, such as colossal magneto-resistive and high-Tc materials. The very high power levels of the new source will allow non-linear effects to be observed as well as the creation of novel states of materials, including electric-field driven localization[4]. We will give examples of existing work in these areas and present opportunities afforded by the new source.

Near-Field Second Harmonic Microscopy of Thin Ferroelectric Films

1999 ◽  
Vol 596 ◽  
Author(s):  
I. I. Smolyaninov ◽  
H. Y. Liang ◽  
C. H. Lee ◽  
C. C. Davis ◽  
L. D. Rotter ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Near Field ◽  
Laser System ◽  
Optical Resolution ◽  
Optical Probe ◽  
Ferroelectric Materials ◽  
Scanning Probe ◽  
Fast Time ◽  
Regenerative Amplifier ◽  
Time Resolved

AbstractNear-field second harmonic microscopy is ideally suited for studies of local nonlinearity and poling of ferroelectric materials at the microscopic level. Its main advantages in comparison with other scanning probe techniques are the possibility of fast time-resolved measurements, and substantially smaller perturbation of the sample under investigation caused by the optical probe. We report second harmonic imaging of the surface of thin BaTiO3 films obtained in a near-field microscopy setup using a Ti:sapphire laser system consisting of an oscillator and a regenerative amplifier operating at 810 nm. Optical resolution on the order of 80 nm has been achieved.

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