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Sukesh Roy
Texas A&M University
OpticsPhysicsFemtosecondRaman scatteringLaser
267Publications
33H-index
3,872Citations
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Publications 260
Newest
#1Paul S. HsuH-Index: 14
#2Naibo JiangH-Index: 28
Last. Sukesh RoyH-Index: 33
view all 7 authors...
Picosecond laser electronic-excitation tagging (PLEET) was demonstrated in a Mach-6 Ludwieg tube at a repetition rate of 100 kHz using a 1064 nm, 100 ps burst-mode laser. The system performance of high-speed velocimetry in unseeded air and nitrogen Mach-6 flows at a static pressure in the range of 5–20 torr were evaluated. Based on time-resolved freestream flow measurements and computational fluid dynamics (CFD) calculations, we concluded that the measurement uncertainty of 100 kHz PLEET measure...
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#1Stephen W. Grib (FFO: Wright-Patterson Air Force Base)H-Index: 1
#2Paul S. HsuH-Index: 14
Last. Sukesh RoyH-Index: 33
view all 7 authors...
Krypton planar laser-induced fluorescence (Kr PLIF) was demonstrated at a repetition rate of 100 kHz. To achieve this increased rate, a custom injection-seeded optical parametric oscillator was built to efficiently convert the 355 nm output of a high-energy, high-repetition-rate nanosecond burst-mode laser to 212.56 nm to excite Kr from the ground to the 5p[1/2]0 electronic state. Successful tracking of flow structures and mixture fraction was demonstrated using detection speeds 100 times greate...
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#1Tongxun YiH-Index: 12
Last. M. J. Casiano (MSFC: Marshall Space Flight Center)H-Index: 1
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Reported is a three-step procedure (also referred to as the observer) for fast and unbiased determination of the dominant frequencies and amplitude of thermoacoustic oscillations. The first step is...
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#1Mark Gragston (UT: University of Tennessee)H-Index: 5
#1Paul Steve Hsu (AFIT: Air Force Institute of Technology)
Last. Sukesh RoyH-Index: 33
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Time-gated picosecond laser-induced breakdown spectroscopy (ps-LIBS) for the determination of local equivalence ratios in atmospheric-pressure adiabatic methane-air flames is demonstrated. Traditional LIBS for equivalence-ratio measurements employ nanosecond (ns)-laser pulses, which generate excessive amounts of continuum, reducing measurement accuracy and precision. Shorter pulse durations reduce the continuum emission by limiting avalanche ionization. Furthermore, by contrast the use of femtos...
2 CitationsSource
#1Andrew D. Cutler (GW: George Washington University)H-Index: 23
#2Keith D. ReinH-Index: 6
Last. Naibo JiangH-Index: 28
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Simultaneous multi-point multi-parameter flow measurement using Interferometric Rayleigh scattering (IRS) at 100-kHz repetition rate is demonstrated. Using a burst-mode laser and an un-intensified high-speed camera, interferograms are obtained that contain spatial, temporal and scattered light frequency information. The method of analysis of these interferograms to obtain simultaneous multi-point flow velocity and temperature measurements is described. These methods are demonstrated in a 100-kHz...
1 CitationsSource
#1Jordan Fisher (Purdue University)H-Index: 1
#2Michael E. Smyser (Purdue University)H-Index: 2
Last. Terrence R. Meyer (Purdue University)H-Index: 32
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Burst-mode femtosecond laser electronic excitation tagging (FLEET) of nitrogen is introduced for tracking the velocity field in high-speed flows at kilohertz–megahertz (kHz–MHz) repetition rates without the use of added tracers. A custom-built Nd:glass femtosecond laser is used to produce 500 pulses per burst with pulses having a temporal separation as short as 1 µs, an energy of 120 µJ, and a duration of 274 fs. This enables 2 orders of magnitude higher measurement bandwidth over conventional k...
2 CitationsSource
#1K. Arafat Rahman (Purdue University)H-Index: 3
#2Erik L. Braun (Purdue University)
Last. Terrence R. Meyer (Purdue University)H-Index: 32
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The sensitivity of high-repetition-rate hybrid femtosecond/picosecond (fs/ps) rotational coherent anti-Stokes Raman scattering (RCARS) is strongly influenced by the energy available for the ps probe pulse. In this work, a high-energy ps probe pulse that is time-synchronized with the fs pump/Stokes pulse is achieved by using a diode-pumped Nd:YAG amplifier seeded at 1064.4 nm by the output of a fs optical parametric amplifier. Nearly transform-limited, 10 ps pulses with up to 800 µJ/pulse and a b...
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#1Venkat Athmanathan (Purdue University)H-Index: 1
#2James E. Braun (Purdue University)H-Index: 53
Last. Mikhail N. Slipchenko (Purdue University)H-Index: 32
view all 8 authors...
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#1Zhili Zhang (UT: University of Tennessee)H-Index: 15
#2Cary Smith (UT: University of Tennessee)H-Index: 3
Last. Sukesh RoyH-Index: 33
view all 8 authors...
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#1John Carter (Georgia Institute of Technology)H-Index: 1
#2Gokul Pathikonda (Georgia Institute of Technology)H-Index: 5
Last. Devesh Ranjan (Georgia Institute of Technology)H-Index: 17
view all 6 authors...
Recent developments of burst-mode lasers and imaging systems have opened new realms of simultaneous diagnostics for velocity and density fields at a rate of 1 kHz–1 MHz. These enable the exploration of previously unimaginable shock-driven turbulent flow fields that are of significant importance to problems in high-energy density physics. The current work presents novel measurements using simultaneous measurements of velocity and scalar fields at 60 kHz to investigate Richtmyer-Meshkov instabilit...
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