Terrence R. Meyer
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View article: Megahertz Rate Optical Diagnostics of Explosively Generated Soot
Megahertz Rate Optical Diagnostics of Explosively Generated Soot Open
Detonation of a solid explosive produces a turbulent and luminous post‐detonation fireball containing condensed carbon soot. Diagnostics of soot dynamics are needed for model validation and to interpret emission signals. Diffuse back‐illum…
View article: High-energy, low-jitter, narrowband ps probe laser for kHz-rate fs/ps coherent anti-Stokes Raman scattering
High-energy, low-jitter, narrowband ps probe laser for kHz-rate fs/ps coherent anti-Stokes Raman scattering Open
Hybrid fs/ps coherent anti-Stokes Raman scattering (CARS) thermometry often utilizes ps probe pulses derived from pulse shaping or spectrally filtering the primary laser source or by synchronization with a low repetition rate external lase…
View article: High-efficiency narrow-bandwidth KTP optical parametric oscillator for kHz–MHz planar laser-induced fluorescence
High-efficiency narrow-bandwidth KTP optical parametric oscillator for kHz–MHz planar laser-induced fluorescence Open
The electronic excitation of key combustion species or flow tagging of chemical species requires a narrowband tunable UV source. In this work, a potassium titanyl phosphate (KTP) burst-mode optical parametric oscillator (OPO) pumped by a 5…
View article: Four-dimensional laser-induced fluorescence and tomography of liquids
Four-dimensional laser-induced fluorescence and tomography of liquids Open
The bulk liquid deformation and breakup of droplets are inherently three-dimensional and important in various spray and multiphase industrial processes. Time-resolved volumetric laser-induced fluorescence (VLIF) is investigated to characte…
View article: Analysis of picosecond coherent anti-Stokes Raman spectra for gas-phase diagnostics
Analysis of picosecond coherent anti-Stokes Raman spectra for gas-phase diagnostics Open
We present a hybrid frequency- and time-domain solution, applicable to the case of picosecond coherent anti-Stokes Raman scattering (CARS), for gas-phase diagnostics. A solution has been derived based on both physical arguments and four-wa…
View article: Development of kHz-rate CO Laser-Induced Fluorescence in High Speed Flows
Development of kHz-rate CO Laser-Induced Fluorescence in High Speed Flows Open
Understanding boundary layer transition is fundamental to hypersonic vehicle design as the significant heating induced by the transition process informs the development of vehicle thermal protection systems. Carbon-based thermal protection…
View article: Spatiotemporally resolved 5-MHz visualization and particle image velocimetry in early time multiphase blasts
Spatiotemporally resolved 5-MHz visualization and particle image velocimetry in early time multiphase blasts Open
• This study evaluates burst-mode laser-based particle-field visualization and time-resolved particle image velocimetry (TR-PIV) for planar measurements up to 5 MHz. • The cross-sectional flow structure, velocity, and acceleration of solid…
View article: Spectrally filtered ps–ns emission dynamics of atmospheric-pressure nanosecond pulsed plasmas
Spectrally filtered ps–ns emission dynamics of atmospheric-pressure nanosecond pulsed plasmas Open
The temporal dynamics of atmospheric-pressure nanosecond pulsed plasma discharges in a pin-to-pin electrode configuration are studied using streak-camera line imaging of the interelectrode gap with a time resolution as short as ∼25 ps. Dis…
View article: Imaging Pyrometry and Optical Depth Measurements in Explosive Fireballs using High-Speed Imaging
Imaging Pyrometry and Optical Depth Measurements in Explosive Fireballs using High-Speed Imaging Open
View Video Presentation: https://doi.org/10.2514/6.2022-1311.vid A significant portion of the energy released by an explosive is contained in a post-detonation fireball. Quantitative characterizations of in situ optical properties are need…
View article: DEVELOPMENT OF A LIFETIME PRESSURE SENSITIVE PAINT PROCEDURE FOR HIGH-PRESSURE VANE TESTING
DEVELOPMENT OF A LIFETIME PRESSURE SENSITIVE PAINT PROCEDURE FOR HIGH-PRESSURE VANE TESTING Open
Optical measurements based on fast response Pressure Sensitive Paint (PSP) provide enhanced spatial resolution of the pressure field. This paper presents lifetime PSP at 20 kHz, with precise calibrations, and results from a demonstration i…
View article: Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow
Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow Open
Characterization of the spray resulting from a 1 mm diameter liquid ethanol jet injection into a supersonic air crossflow is presented.The isentropic Mach number at the injection location is 1.94, while the momentum flux ratio is varied be…
View article: Temperature-dependent x-ray fluorescent response from thermographic phosphors under x-ray excitation
Temperature-dependent x-ray fluorescent response from thermographic phosphors under x-ray excitation Open
Phosphor thermometry has been successfully applied within several challenging environments. Typically, the thermographic phosphors are excited by an ultraviolet light source, and the temperature-dependent spectral or temporal response is m…
View article: Development of Burst Mode KTP Optical Parametric Oscillator for MHZ PLIF with Extended Burst Durations.
Development of Burst Mode KTP Optical Parametric Oscillator for MHZ PLIF with Extended Burst Durations. Open
with an efficiency of {approx}18% at 22 {sup 0}C. It was established from the threshold oscillation characteristics that the stimulated scattering gain was {approx}30 cm GW{sup -1} . Simultaneous parametric generation of two collinear sign…
View article: Visible emission spectra of thermographic phosphors under x-ray excitation
Visible emission spectra of thermographic phosphors under x-ray excitation Open
Thermographic phosphors have been employed for temperature sensing in challenging environments, such as on surfaces or within solid samples exposed to dynamic heating, because of the high temporal and spatial resolution that can be achieve…
View article: Evaluation of liquid-phase thermometry in impinging jet sprays using synchrotron x-ray scattering
Evaluation of liquid-phase thermometry in impinging jet sprays using synchrotron x-ray scattering Open
Liquid thermometry during primary and secondary breakup of liquid sprays is challenging due to the presence of highly dynamic, optically complex flow features. This work evaluates the use of x-ray scattering from a focused, monochromatic b…
View article: Scalable Heat Transfer Characterization on Film Cooled Geometries Based on Discrete Green’s Functions
Scalable Heat Transfer Characterization on Film Cooled Geometries Based on Discrete Green’s Functions Open
The aerothermal characterization of film-cooled geometries is traditionally performed at reduced temperature conditions, which then requires a debatable procedure to scale the convective heat transfer performance to engine conditions. This…