Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 101 for “"Photon counting"”.
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Tracking system for photon-counting laser radar
… thesis is to build the tracking system for a photon-counting laser radar specifically a laser radar that has the ability to perform direct and coherent detection measurement at low signal levels with common laser, optics and detector hardware. The heart of the tracking algorithm is a Kalman …
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Multi-Material Discrimination Using Photon Counting Spectral Computed Tomography
… ability for accurate quantitation. When using photon-counting spectral detectors (PCDs), some of these limitations can be overcome. However, low dose and computationally efficient mechanisms to yield volumetric maps of more than two or three materials remain as a significant challenge. …
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A photon counting pixel detector for x-ray imaging
… 3 presents measurements made by the author on a photon counting detector (PCD1) comprising a PCC1 (MEDIPIX1) readout chip bumpbonded to silicon and gallium arsenide pixel detectors. Tests on the seperate readout chip and the bump-bonded assembly are shown with comparisons between the performance …
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Information theoretic approach for assessing image fidelity in photon-counting imagers
The method of photon-counting integral imaging has been introduced recently for three-dimensional object sensing, visualization, recognition and classification of scenes under photon-starved conditions. In this work we present an information-theoretic model for the photon-counting imaging (PCI) …
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Long-range depth profiling based on time-correlated single-photon counting
Single-photon detection technologies are of high relevance to light detection and ranging (LiDAR) applications for the range resolution and surface profiling of distant target objects. Modern single-photon detectors offer high quantum efficiencies and small timing jitters in the order of tens of …
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High-resolution Photon Counting OTDR based Interrogation of Multiplexing Broadband FBG Sensors
… fiber Bragg grating sensing system using photon-counting optical time domain reflectometry (pc-OTDR) based multiplexing technology. The system uses a Fresnel reflection OTDR with a zero deadzone to detect FBG sensors, which improves both the system detection ability and spatial resolution. …
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Development of an MR-compatible SPECT system based on energy resolved photon counting detectors
… in the clinical diagnosis and therapy. Single Photon Emission Computed Tomography (SPECT) is one of the most important nuclear imaging modalities, and it gives the functional imaging of the region of interest. MR can provide the anatomical imaging and enjoys better soft tissue contrast …
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On the development and application of a photon counting imaging system for broad spectrum luminescence analysis
Novel luminescence equipment, the Photon Counting Imaging System (PCIS), with broad spectrum high sensitivity imaging capabilities, incorporating both thermal and multi-source optical stimulation, and providing flexible facilities for the optical filtering of signals, was designed and constructed. …
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On the development and application of a photon counting imaging system for broad spectrum luminescence analysis
Novel luminescence equipment, the Photon Counting Imaging System (PCIS), with broad spectrum high sensitivity imaging capabilities, incorporating both thermal and multi-source optical stimulation, and providing flexible facilities for the optical filtering of signals, was designed and constructed. …
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Fundamental Considerations of the Photon Counting Technique and Its Application in a Comparison of Flame Spectrophotometric Techniques
Made available in DSpace on 2014-12-10T23:01:04Z (GMT). No. of bitstreams: 1 7114845.pdf: 2979496 bytes, checksum: c8d470593622c5151b868cf0e2baec29 (MD5) Previous issue date: 1970
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Dynamic pixel selection in free-space photon-counting optical communication systems for the exploitation of excess channel capacity
… spatial information attached to each received photon by filtering out noisy or otherwise undesirable portions of the array in order to exploit any excess channel capacity in the link to allow on-the-fly adjustments of data rates. Preliminary results, specific to the MIT Lincoln Laboratory …
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Arsenic speciation by ion-exchange chromatography with on- line determination by hydride generation: electronic modification of the D.C. plasma by photon counting
… plasma optical system were measured using a new photon-signal integrating device. The_new photon integrator developed and built in this laboratory was based on a previously published design which was further modified to reflect current available hardware. This photon integrator was interfaced to …
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Energy Transfer Among Fluorescent Molecules Dispersed in Thin Films of Polymer or Protein (Rhodamine B, Sulforhodamine 101, Polyvinyl, Poly (Vinyl Alcohol) Bovine Serum Albumin, Time-Correlated Photon Counting, Lifetimes)
Previous research using pulsed time-resolved fluorescence techniques has shown that because rhodamine B (RHB) has an appreciable overlap of absorption and emission spectra, a system of RHB molecules dispersed in poly(vinyl alcohol) (PVOH) can collect light energy and transfer the energy of the …
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Single-photon frequency upconversion for long-distance quantum teleportation and communication
Entanglement generation, single-photon detection, and frequency translation that preserves the polarization quantum state of the photons are essential technologies for long distance quantum communication protocols. This thesis investigates the application of polarization entanglement to quantum …
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Dynamics and spectra in condensed phases : single molecule spectroscopy, electron transfer, and excitation energy transfer
… in a dynamic environment. In particular, the photon counting statistics is investigated for a single molecule undergoing a generic type of spectral diffusion process. An exact analytical solution is found for this case, and various physical limits are analyzed. Second, motivated by recent …
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Stellar interferometry - detectors and the atmosphere.
… Avalanche Photodiode (Si APD) operated in a photon counting mode. Although Si APDs have been available for several years, no commercial photon counting unit was available at the outset of this research, so having specified the parameters for the COAST detector system, research and development …
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The Use of High Pressure Fluorescence Spectroscopy to Investigate Subunit Interactions in Oligomeric Proteins (Neurophysin, Lac Repressor)
… of high pressure fluorescence polarization and photon counting scanning fluorimetry.
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The measurement, creation and manipulation of quantum optical states via photodetection
… aspects. We describe the measurement of mean photon numbers at optical sideband frequencies using homodyne detection. We use our technique to provide a direct comparison to photon-counting measurements and observe that our technique exhibits superior speed, dynamic range and mode selectivity …
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