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Debbie Senesky      
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Debbie Senesky published an article in February 2019.
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Peter C Hauser

174 shared publications

Department of Chemistry; University of Basel; Basel Switzerland

Michael J. Schöning

172 shared publications

Institut für Nano- und Biotechnologien (INB), FH Aachen – Jülich, Jülich, Deutschland

Assefa M. Melesse

159 shared publications

Department of Earth and Environment, Florida International University, Miami, USA

Patrick Eugster

33 shared publications

Department of Computer Science, Purdue University, West Lafayette, IN

Hans Peter Herzig

31 shared publications

EPFL Lausanne, Lausanne 1015, Switzerland

Publication Record
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PREPRINT 0 Reads 0 Citations Gallium Nitride Photodetector Measurements of UV Emission from a Gaseous CH4/O2 Hybrid Rocket Igniter Plume Hannah S. Alpert, Ananth Saran Yalamarthy, Peter F. Satterth... Published: 07 February 2019
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Owing to its wide (3.4 eV) and direct-tunable band gap, gallium nitride (GaN) is an excellent material platform for UV photodetectors. GaN is also stable in radiation-rich and high-temperature environments, which makes photodetectors fabricated using this material useful for in-situ flame detection and combustion monitoring. In this paper, we use a GaN photodetector to measure ultraviolet (UV) emissions from a hybrid rocket motor igniter plume. The normalized photocurrent-to-dark current ratio (NPDR) is a performance metric which simultaneously captures the two desired characteristics of high responsivity and low dark current. The NPDR of our device is record-high with a value of 6 x 10$^{14}$ W$^{-1}$ and the UV-to-visible rejection ratio is 4 x 10$^6$. The photodetector shows operation at high temperatures (up to 250{\deg}C), with the NPDR still remaining above 10$^9$ W$^{-1}$ and the peak wavelength shifting from 362 nm to 375 nm. The photodetector was placed at three radial distances (3", 5.5", and 7") from the base of the igniter plume and the oxidizer-to-fuel ratio (O2/CH4) was varied. The data demonstrates a clear trend of increasing current (and thus intensity of plume emission) with increasing fuel concentration and decreasing separation between the photodetector and the plume. By treating the plume as a black body, and calculating a radiative configuration factor corresponding to the geometry of the plume and the detector, we calculated average plume temperatures at each of the three oxidizer-to-fuel ratios. The estimated plume temperatures were between 850 and 950 K for all three combustion conditions. The temperature is roughly invariant for a fixed fuel concentration for the three tested distances. These data demonstrate the functionality of GaN as a material platform for use in harsh environment flame monitoring.
Article 3 Reads 0 Citations 4th International Symposium on Sensor Science (I3S2015): Conference Report Peter Seitz, Debbie G. Senesky, Michael J. Schöning, Peter C... Published: 23 September 2015
Sensors, doi: 10.3390/s150924458
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
Note: In lieu of an abstract, this is an excerpt from the first page.Excerpt An international scientific conference was sponsored by the journal Sensors under the patronage of the University of Basel. The 4th edition of the International Symposium on Sensor Science (I3S2015) ran from 13 to 15 July 2015 in Basel, Switzerland. It comprised five plenary sessions and one morning with three parallel sessions. The conference covered the most exciting aspects and the latest developments in sensor science. The conference dinner took place on the second evening of the conference. The I3S2015 brought together 170 participants from 40 different countries.