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Radio-Frequency Interference (RFI) is a growing problem for applications based on the Global Navigation Satellite Systems (GNSS), including Earth observation using GNSS — Reflectometry (GNSS-R). Nowadays, many efforts are being concentrated to develop RFI signal detectors with high sensitivity, which can help to control the proliferation of RFI generators or jammers. This work aims at designing and...
Bismuth tri-iodide is a promising candidate for room temperature radiation detection because of its wide band gap energy. This material has higher effective atomic number as compared to germanium and CdZnTe. Its higher density results in improved stopping power for photons. But the presence of impurities limits the expected properties up to a large extent. Reduction of impurity concentration can lead...
We developed an X-ray imager using Yttrium OxyorthoSilicate (Y2SiO5:Ce, YSO) scintillating crystal array and Multi-Anode PhotoMultiplier Tubes (MAPMTs) with the capability of fast X-ray counting and X-ray energy measurement. YSO scintillating crystal array has many advantages. First of all, there is no intrinsic background. We can detect the low energy X-ray photon without internal noise. The X-ray...
Silicon photomultiplier (SiPM) is the next generation sensor that is available for single photon counting. We measured the photon detection efficiency (PDE) for the SiPM in the 400 to 800 nm range and over bias voltage up to 4V using photon counting method. The experimental setup consists of multi-wavelength LEDs, a monochromator, two 2-inch integrating spheres, a NIST calibrated reference photodiode...
We fabricate single-sided strip sensors that are sensitive to light. The strip sensors are AC-coupled, which has coupling capacitors and bias resistors. The sensors are fabricated on a high resistivity and double-sided polished n-type silicon wafer. The sensor is designed as the single-side strip sensor but its backside (n-side) is modified to be sensitive to incoming light. This photo-strip sensor...
A monolithic scintillator has advantages over segmented scintillators due to their reduced dead area and straightforward implementation. Previous methods have used a nearest neighbor approach to match multiple photodetector responses to entries in a predetermined look-up table (LUT). We extend this technique by introducing various inverse interpolation techniques, namely kriging, inverse distance...
We have designed and fabricated silicon photostrip sensors with polysilicon resistors and coupling capacitors. This developed detector consists of two photo-strip sensors sandwiching opposite faces of a crystal scintillator and being oriented orthogonal to each other. This configuration is able to provides the 2 dimensional position information and to measure the energy. Therefore they can be used...
Large-scale multimedia semantic concept detection requires realtime identification of a set of concepts in streaming video or large image datasets. The potentially high data volumes of multimedia content, and high complexity associated with individual concept detectors, have hindered the practical deployment of many current solutions. In this paper, we present a summary of our work in building systems...
Nuclear resonance fluorescence is a physical process that provides an isotope-specific signature that could be used for the identification and characterization of materials. The technique involves the detection of prompt discrete-energy photons emitted from a sample that is exposed to photons in the MeV energy range. Potential applications of the technique range from detection of high explosives to...
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