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A resonance neutron imaging system has been developed based on combination of a glass based Gas Electron Multiplier (Glass GEM) detector and a resonance filter. This system has the capability of imaging the neutron spatial distribution in energy of resonance peaks corresponding to a resonance filter. A clear dip corresponding to a resonance peak of 109Ag (4.2∼6.3 eV) was confirmed in measured response...
This work focuses on the development of novel nano-engineered microchannel plates (MCPs) to enhance a new generation of NUV-visible light photon counting detectors that have a wide range of applications in LIDAR, 3D topographic imaging, high-speed photography, bio-medial fluorescence microscopy and astronomical imaging. The MCPs are borosilicate glass micro-capillary arrays functionalized using atomic...
The development is described of a 360 GHz sub-harmonic mixer for the active and passive sub-systems of the TeraSCREEN security scanner by STFC RAL Space. The mixers operate as predicted with state-of-the-art performance. A radiometer sensitivity measurement also shows the devices have outstanding performance.
In this paper, we apply the pixel imaging to generate images for catching picture information. Pixel imaging technique has great advantages over the array imaging in the cost area. It has been found out that multi-spectral imaging with high resolution can be acquired when compared with traditional methods. In the part of dynamic imaging, some technical issues are discussed for the use of the pixel...
We discuss the modelling, implementation and characterization of antenna-coupled field-effect transistor detectors for THz frequencies. Detectors have been fabricated using a commercial 65-nm CMOS foundry process. At 4.1 THz resonance frequency and optimum operation conditions a responsivity of 86 V/W and noise-equivalent power of 113 pW/√Hz has been measured.
This paper describes and addresses the challenges that are encountered while designing a 900 GHz antenna for FET detectors using a standard submicron CMOS technology. The reduced metal stack, the problem of surface waves and technology-related rules are taken into account in order to properly design an efficient antenna, with the objective to couple it to field-effect transistor (FET) detectors in...
We used a hybrid configuration of monolayer MoS2 and silver nanowires to demonstrate the coupling, propagation and imaging of surface plasmon polaritons. The results suggest highly efficient way of plasmonic nanophotonic circuits.
We propose a compact endoscopic probe for tissue margin detection through reflection measurements in the terahertz band (0.1 – 3 THz). Compared to scalar reflectivity measurements, a fully polarimetric characterization of tissue and malignancy margins provides order-of-magnitude better differentiation, facilitating medical diagnosis of internal organs, such as the gastrointestinal tract. The compact...
We demonstrated the operation of double-layered current-biased kinetic inductance detectors (CB-KIDs) made of Nb by irradiating pulsed laser. A Nb-based CB-KID operates at temperatures appreciably lower than a superconducting transition temperature Tc because it senses a time derivative of kinetic inductance dLk/dt in a Nb meanderline. We fabricated double-layered meanderlines to detect a coordinate...
This paper presents the evaluation of two perspective techniques in flash imaging lidar realization for space applications. One of these techniques is the indirect time-of-flight measurement, implemented in the combination of APS/IPPD array and continuous wave harmonically modulated laser. The other technique is the direct time-of-flight, realized in a combination of SPAD array and picosecond pulse...
This paper analyzes some advantages of Silicon-on-Insulator (SOI) based photodetectors for bioluminescence imaging. It shows that SOI based sensors not only solve the bulk carriers problem, it can also act as a very selective spectral filter by acting as a resonant cavity, which is useful in application with a very narrow spectrum of interest, such as bioluminescence imaging. Then, the authors discuss...
Target detectors usually utilize a single a priori target spectral signature as the input. However, the detection results are greatly affected by the quality of the a priori target spectral signature, as the spectral variability phenomenon is universal in hyperspectral image data. This paper proposes a sparsity-based method to generate an optimal target spectrum from limited target training spectra,...
In this paper, we present the design of a columnwise readout integrated circuit (ROIC) along with thermal modeling of uncooled thermal sensor array. Two major noise sources, namely fixed pattern noise due to process variation and self-heating due to electrical biasing of microbolometer detectors, are addressed in this work. Fully differential approach is used at the input stage in order to reject...
Imaging techniques for domain analysis are still one of the most important means of investigation in magnetic materials field [1]. In this work, we develop a new approach to perform magneto-optical imaging, applying for the first time a high resolution Ghost Imaging (GI) protocol to perform Faraday microscopy, and thus to reconstruct the image of Weiss domains within a magnetic sample.
The feasibility of generating tomographic images of objects inside crude oil is investigated in this paper. Crude oil in the visible spectrum usually appears as black oil. Nevertheless, in the mid-infrared range, crude oil presents bands of high transmission. These windows of opportunities are explored to obtain data for generating cross-section images. In this paper, a first generation tomograph...
We have so far developed a fluorescent X-ray computed tomography (FXCT) with a two-dimensional detector based on the pinhole effect for imaging non-radioactive agent distribution in a small animal. However, it takes several hours to acquire a series of projections required for an image with quality sufficient for biological observation. To overcome the difficulty, we realize a high-speed imaging by...
The spatial distribution of DD fusion in a 1.6 kJ plasma focus (PF) device is investigated using the coded aperture imaging (CAI) technique, enabling single shot fusion images to be obtained. Simultaneously, two beryllium fast-neutron activation detectors are employed to measure neutron yield and anisotropy. The coded mask patterns used are based on Singer cyclic difference sets with various open...
A generalization of the correlation function is explored which, besides a relative time shift between the signals to be correlated, also takes into account different scalings on the time axis (i.e., magnification/reduction). It is shown how the generalized correlation function for continous signals can be sampled and computed without loss of information and thus can be described by discrete-time signals...
The Poisson Factor Analysis (PFA) is applied to recover signals from a Poisson compressive sensing system. Motivated by the recently developed compressive X-ray imaging system, Coded Aperture Coherent Scatter Spectral Imaging (CACSSI) [1], we propose a new Bayesian reconstruction algorithm. The proposed Poisson-Gamma (PG) approach uses multiple measurements to refine our knowledge on both sensing...
Rotational modulation collimation (RMC) is a technique commonly used for standoff imaging of radiological sources in the context of homeland security. The paper presents a novel method for gamma ray image reconstruction from modulation signals acquired by a RMC detector prototyped by DSTO. The image is represented in a parametric form as a weighted sum of Gaussian radial basis functions. The problem...
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