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The emergence of Internet of Things (IoT) has brought forth new opportunities by seamlessly integrating the physical world using computing, sensing, and wireless networks, transforming it into a cyber-physical system. An essential building block enabling an IoT is a sensing system. The use of “near-field communication (NFC)” has gained attention in recent years, as it enables low-power short-range...
Real-time and high quality imaging is of great importance for security application in civil and military fields, especially for the detection of hidden threats carried by a person. Furthermore, passive imaging detection system based on THz radiation focuses more particular attention because of that it can perform the detection without privacy issues and doing harm to human body. This paper analyses...
Coded aperture compressive spectral imagers allow capturing spectral imaging information of a 3D cube with just a single 2D measurement of the coded and spectrally dispersed source field. These imagers systems often rely on existing FPA detectors, SLMs, and micro mirror devices, which are often mismatched in pitch size and pixel resolution. A traditional solution consists on grouping several pixels...
An 820-GHz 8×8 imaging array of diode-connected NMOS transistor detectors, and 5-, and 10-THz fundamental Schottky diode detectors are demonstrated in a 130-nm bulk CMOS process. Measured mean optical responsivity (Rv) of 2.6kV/W and mean optical NEP of 36pW/Hz1/2 at a modulation frequency of 1MHz are achieved for the 820-GHz imaging array. The NEP is more than 2.5X lower than that of the previously...
The coded aperture snapshot spectral imaging (CASSI) system is an optical architecture designed to capture spectral images using the compressive sensing (CS) concepts. CASSI senses the spectral information of a three dimensional scene by using two-dimensional coded focal plane array (FPA) projections. The CASSI system improves the sensing speed and reduce the large amount of collected data given by...
A spectral image is a 3-dimensional spatio-spectral set with a large amount of spectral information for each spatial location of a scene. Compressive Spectral Imaging techniques (CSI) permit to capture the 3D scene in 2-dimensional coded projections. The Coded Aperture Snapshot Spectral Imager (CASSI) is an optical architecture to sense a spectral image in a single projection by applying CSI. CSI...
In this paper, we propose a denoising algorithm based on the Total Variation (TV) model. Specifically, we associate to the regularization term of the Rodin-Osher-Fatimi (ROF) functional a small weight whenever denoising is performed in edge and texture regions, which means less regularization and more details preservation. On the other hand, a large weight is associated if the region being filtered...
This paper proposes a fully-integrated 860-GHz terahertz wave sensor. The sensor integrates a terahertz detector and readout circuit in 180-nm standard CMOS process. The readout circuit consists of a low-noise instrumentation amplifier and a high-resolution AZ-ADC. Transmissive imaging without source modulation (no lock-in technique required) is realized using the sensor. The detector consists of...
CMOS technology has found its way in THz imaging applications. Utilizing the plasma wave theory, a MOSFET device can detect THz radiation beyond the cutoff frequency. Assisted by the system-on-packaging technique, a CMOS source delivers radiation power more effectively. An imaging system demonstrates that a low-cost CMOS solution is feasible.
In order to obtain the corona characteristics of electrodes under positive DC and AC composite voltages, the experiment platform of series circuit was established by using a stainless rod-plane electrode, in which rod electrode was applied with positive DC voltage, and plane electrode was applied with AC voltage. The change of ultraviolet photon counting was used as the corona criterion and the characteristics...
The observation of corona discharge points on the surfaces of the insulating materials and conductors seem to be quite crucial during the corona researches. The ‘solar blind’ ultraviolet imaging detector cameras have performed efficiently in detecting corona discharge in power facilities. In order to investigate the negative dc corona effects on ultraviolet photon count, a corona measurement system...
We have developed silicon (Si) strip photon counting detectors for modalities used in clinical breast imaging including mammography, tomosynthesis, computed tomography, and lump imaging in the operating room. Typically, x-ray integrating detectors based on scintillating cesium iodide CsI(Tl) or amorphous selenium (a-Se) are used in most commercial systems. Recently, mammography instrumentation has...
Methods such as Compton imaging can be used to image a radiation field, including localizing different radioactive isotopes. Depth of interaction detection enables Compton imaging using Cadmium Zinc Telluride (CZT) detector for gamma ray energies above ∼300 keV. We have developed an imaging technique for low energy gamma rays, using an array of CZT sensors, based on the non-uniform penetration of...
The recently commissioned Energy-Resolved Neutron Imaging System, RADEN, located at the J-PARC Materials and Life Science Experimental Facility (MLF), is the world's first dedicated high-intensity, pulsed neutron imaging instrument. In addition to conventional radiography and tomography, the wide bandwidth and accurate measurement of neutron energy by time-of-flight is utilized to perform energy-resolved...
A 12-bit 2M Samples/s pipelined SAR ADC for CZT-based imaging system is presented. It pipelines a first stage 6-bit SAR-based Multiplying Digital Analog Converter (MDAC) and a second stage 8-bit SAR ADC. The inter-stage gain of 16 instead of 64 is implemented in the 6-bit SAR-based MDAC for minimizing the power dissipation. The second stage 8-bit SAR ADC uses a split-capacitor architecture for reducing...
Particle tracking technology is currently being explored with Monte Carlo simulation studies as well as first experimental prototypes as a method to improve the planning and delivery accuracy of hadron therapy. Advanced particle tracking technology is required to provide large-area detectors capable of single-particle registration at high data rates for applications such as particle imaging and pencil...
iQID (intensified quantum imaging detector) is a novel CCD/CMOS-based ultra-high-resolution photon-counting gamma-ray and x-ray detector technology recently developed at the Center for Gamma-Ray Imaging (CGRI) at the University of Arizona. In this work, we report further advances in iQID's capabilities in terms of dark-noise suppression, sensitivity and field of view (FOV). A new frame-parsing algorithm...
Modeling and optimizing radiological threat detection problems in urban areas is facilitated through prior characterization of background activity distributions. The background emissivity of static objects such as buildings and roads is highly dependent on the composition of these elements of urban scenes. We perform a feasibility study to determine whether truck-based (non-imaging) detector measurements...
‘Open-field’ PET imaging offers the key capability of correlating functional changes in the brain of an awake animal with its behavioral response to environmental or pharmacologic challenges. Previously we have demonstrated the feasibility of this concept for rats using motion compensation techniques. That system, however, is not suitable for imaging the mouse brain due to limitations imposed by the...
This paper documents the R&D undertaken jointly by the ISIS Neutron Detector Group and the Oxford University PImMS collaboration. The aim of this project was to develop a high resolution, energy resolved, neutron imaging detector named GP2. This conference record introduces the GP2 detector and lists its key physical properties; however the emphasis here will be on the earlier proof-of-principle...
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