Sensors & Optical Diagnostics

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CRF Experiment Confirms Accepted Oxidation Scheme of Proposed Diesel Alternative: Dimethyl Ether

Combustion Research Facility (CRF) researchers Kai Moshammer, Ahren Jasper, Arnas Lucassen, Arkke Eskola, Craig Taatjes, and Nils Hansen (all in Sandia’s Combustion Chemistry Dept.) as part of an international collaboration reported, in Journal of Physical Chemistry A, detecting and identifying previously undiscovered partially oxidized intermediates. This work provides experimental confirmation of the generally accepted dimethyl [...]

Sandia-Developed LED Pulser Delivers Laser-Like Performance at Fraction of the Cost

The high-brightness, rapidly pulsed, multicolor light-emitting diode (LED) driver delivers lighting performance that exceeds that of conventional (laser/arc-light) sources for scientific, industrial, or commercial uses at a fraction of the cost. “I had the idea a few years ago to see if high-powered multicolored LEDs could be pulsed rapidly by an electronic circuit to produce [...]

CRF Researchers Are Source for 2015 QTR Sidebar Content

On September 10th, Energy Secretary Ernest Moniz released the second Quadrennial Technology Review (QTR 2015), which examines the most promising research, development, demonstration, and deployment (RDD&D) opportunities across energy technologies to effectively address the nation’s energy needs. Specifically, this analysis identifies the important technology RDD&D opportunities across energy supply and end-use in working toward a [...]

Sandia Develops Phased-Array Sources Based on Nonlinear Metamaterial Nanocavities

The SH-generating quantum well layer (pink) and the beam-shaping split-ring metamaterial resonators (the “C”-shaped structures). The phase-coherent emission from individual resonators opens the door for many beam-shaping applications, some of which are presented in the insets. Each device type can be achieved via proper design of individual metamaterial resonators and their arrangement on the [...]

Digital In-Line Holography Helps Researchers ‘See’ into Fiery Fuels

Accidents, such as trucks crashing on a highway or rockets failing on a launch pad, can create catastrophic fires. It’s important to understand how burning droplets of fuel are generated and behave in such cases. Sandia researchers developed 3-D measurement techniques based on digital in-line holography (DIH). Sandia advanced DIH techniques with new algorithms to [...]

Sandia Optical Diagnostics Researcher Wins DOE Early Career Award

Sandia Combustion Research Facility (CRF) scientist Christopher Kliewer (in Sandia’s Combustion Chemistry Dept.) won a DOE Office of Science (SC) Early Career Research Program award to develop new optical diagnostics to study interfacial combustion interactions that are major sources of pollution and vehicle inefficiency. The funding opportunity for researchers in universities and DOE national laboratories, [...]

CRF Researchers Develop New Approach for Low-Cost Emissions Diagnostics

Monolithic dual-etalon cavity ring-down spectrometer. Modeling and experiments show that it is feasible to perform multiple-species detection at sub-ppm levels with a low-resolution broad-band infrared laser. Target measurement species include CO2, CH, N2O, NO2, SO2, HCl, and CH4, among others, simultaneously, and without process treatment or dehumidification of the exhaust sample—potentially reducing current [...]

Direct Measurement of Key Molecule Will Increase Accuracy of Combustion Models

Sandia chemist John Savee (left) identified cycloheptadiene as the best fuel for creating a detectable QOOH, and Sandia computational expert Ewa Papajak (right) and her adviser, Judit Zádor, used quantum chemistry to explain the reaction mechanism. Savee and Papajak appear in front of the Advanced Light Source's Multiplexed Photoionization Mass Spectrometer at Lawrence Berkeley [...]

By | 2016-12-02T18:48:16+00:00 March 3rd, 2015|Computational Modeling & Simulation, CRF, Energy, Facilities, News, News & Events, Sensors & Optical Diagnostics, Transportation Energy|Comments Off on Direct Measurement of Key Molecule Will Increase Accuracy of Combustion Models

Predicting Pressure-Dependent Combustion Chemical Reactions

The Combustion Research Facility (CRF) at Sandia’s Livermore, California, site. Researchers at Sandia and Argonne national laboratories have demonstrated, for the first time, a method to successfully predict pressure-dependent chemical reaction rates—an important breakthrough in combus­tion and atmospheric chemistry that is expected to benefit auto and engine manufacturers, oil and gas utilities, and [...]

By | 2016-12-02T18:48:17+00:00 February 25th, 2015|Capabilities, Computational Modeling & Simulation, CRF, Energy, Energy Efficiency, Facilities, News, News & Events, Office of Science, Research & Capabilities, Sensors & Optical Diagnostics, Systems Analysis, Transportation Energy|Comments Off on Predicting Pressure-Dependent Combustion Chemical Reactions

New Polarized-Depolarized Measurement Capability Extends Use of Raman/Rayleigh Methods to More Flame Types

Figure 1.  A second Raman/Rayleigh line-imaging detection unit allows researcher to simultaneously measure polarized and depolarized components of Raman scattering signals, helping to overcome fluorescence interference from soot precursors in hydrocarbon flames. Allowing single-shot measurements of all major species in nonsooting flames of simple fuels, such as H2 and CH4, spontaneous Raman scattering [...]

By | 2016-12-02T18:48:37+00:00 April 23rd, 2014|Capabilities, CRF, Energy, Facilities, News, News & Events, Research & Capabilities, Sensors & Optical Diagnostics, Transportation Energy|Comments Off on New Polarized-Depolarized Measurement Capability Extends Use of Raman/Rayleigh Methods to More Flame Types