The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The Energy-Resolved Neutron Imaging System RADEN, located at the J-PARC Materials and Life Science Experimental Facility in Japan, is the world's first dedicated high-intensity, short-pulsed neutron imaging beam line. To carry out energy-resolved neutron imging at RADEN, we use cutting-edge detector systems employing micropattern detectors and data acquisition systems based on Field Programmable Gate...
We are currently developing a dual-particle imager based on the rotational modulation collimator (RMC) technique employing Cs2LiYCl6:Ce (CLYC) detector. A symmetric mask design has been conventionally used for RMC, however, it has an intrinsic problem of not being able to distinguish two symmetric sources located with respect to the rotation axis. In the present study, we propose a new design of collimator...
Radiation imaging systems provide a wealth of information for analyzing quantities of interest (enumeration, strength, dimensions) of an uncharacterized source. This capability is useful, for example, when measuring plutonium powder “held up” in unknown locations at reprocessing facilities. Accurate models of the imager are required to infer the quantity of interest. This paper describes the modeling...
Gamma-ray imaging allows for efficient detection, characterization, and localization of compact radioactive sources in cluttered environments. Fieldable detector systems employing active planar coded masks demonstrate broad energy sensitivity via both coded aperture and Compton imaging modalities. Because planar configurations suffer from a limited field-of-view, we introduce a novel design by rearranging...
We present the development of a mobile survey spectrometer and fieldable Compton gamma-ray imager. The detector employs CsI(Tl) scintillator coupled to SensL silicon photomultipliers (SiPMs) and incorporates a unique modular design, where individual units can be employed separately in applications requiring a compact detector, e.g. military operations, or combined together for those requiring a more...
This paper presents the design and electrical implementation of a Wilkinson analog-to-digital converter for imaging detectors based on the use of silicon photo-multiplier scintillators. A multi-channel architecture, which shares the ramp generator among the different channels, is used to maximize the sampling frequency with the minimum power consumption and silicon area. The circuit has been implemented...
An imaging flow cytometer based on Fourier sampling is demonstrated to enable high throughput screening with a frame rate of 625 kHz and a throughput of 100,000 cells/s for the first time.
In this paper, we propose a method for automatic signature segmentation using hyper-spectral imaging. The proposed method first uses the connected component analysis and local features to segment the printed text and signatures. Secondly, it uses spectral response of text, signature, and background to extract signature pixels. The proposed method is robust, and remains unaffected by color and intensity...
The terahertz (THz) imaging enhanced with compact diffractive lenses and sensitive room temperature THz detectors was demonstrated to be suitable for carcinoma zones screening in bio-tissues. Optical transmission of the dehydrated histological sections with a colon cancer was measured with close to wavelength-limited spatial resolution at 0.6 THz frequencies. High number of the explicit areas where...
Compressive THz imaging holds the potential for increased spatial resolution and imaging speed when only a small number of detectors is available. The understanding of illumination patterns is essential in determining the performance for a compressive imaging setup. The results presented here start with an evaluation of the performance of different mask types. Then the influence of deviations of the...
In this report we demonstrate a high-spectral-resolution terahertz (THz) imaging system on the basis of a THz quantum-cascade laser (QCL), a fast scanning mirror (FSM), and a cryogenic-cooled Ge:Ga detector. During the scan through an absorption cell filled with methanol (CH3OH), spectral information is obtained through QCL frequency tuning within a range that covers the feature of interest. Our results...
In the FP7 project CONSORTIS, a dual-band passive imager is being developed for security applications. The latter is based on bolometer based kinetic inductance detectors operating at two frequency bands to improve the collection of thermal information. These bolometric detectors rely on a frequency selective absorber (FSA) to achieve the two bands. In this contribution, we describe the optimization...
Recent developments of THz detector arrays based on plasma wave field effect transistors are presented. By simultaneous development of the transistor arrays with their read-out circuits and diffractive 3D printed optics we demonstrate systems for imaging in 300 GHz atmospheric window with cameras or fast linear scanner. The first high speed THz postal scanner developed for real time fast A4 envelopes...
We present an antenna-coupled 1 × 64 Nb5N6 microbolometer array detectors for real-time terahertz (THz) imaging. The intrinsic average responsivity of the detectors in the array is 650 V/W, and the corresponding noise equivalent power (NEP) is 17 pW/√Hz. The array chip is combined with a low noise readout circuit with 64 channels. The array detector was preliminary used for THz source imaging, and...
A test structure comprehending an antenna-coupled FET-based THz detector integrated with readout electronics is designed and fabricated in a 0.15-μm standard CMOS technology. A low-noise preamplification technique has been employed, based on parametric chopper amplifier, substituting the lock-in apparatus and performing direct analog-to-digital conversion by means of an incremental ΣΔ converter. The...
This paper presents development of the integrated multi-channel readout circuit targeted to support the pixel-line of FET-based THz-detectors. The authors discuss architecture details and design techniques used to address the most important issues related to the processing of very small, low-frequency signals. The effectiveness of the 1/f noise component minimization and crosstalk cancellation, proven...
Novel compound lens based on the new material of CGC (cage-shaped granule of conductor) was applied to the millimeter wave focal plane imaging. Millimeter wave imaging test circuit and the signal receiving system were designed and constructed. Active millimeter wave focal plane imaging was built, and the sharp image which proved that compound lens was feasible for millimeter wave focal plane imaging...
We present and evaluate a multiple-input multiple-output visible light communications (MIMO-VLC) system using imaging angle diversity receiver (ImADR). Differing from the conventional imaging receiver (ImR), which has a two-dimensional circular detector array consisting of vertically oriented detectors, the ImADR has a three-dimensional spherical-cap-shaped detector array composed of angle diversity...
Terahertz imaging based on compressed sensing concept provides an opportunity for high-efficient terahertz imaging solution. In this paper we will first provide a general overview of terahertz imaging technology, and then focus specifically on the experimental implementations of high speed and high-resolution terahertz imaging based on compressed sensing (CS) concept. These include a projector based...
Depth profile reconstruction of a scene at low light levels using an active imaging setup has wide-ranging applications in remote sensing. In such low-light imaging scenarios, single-photon detectors are employed to time-resolve individual photon detections. However, even with single-photon detectors, current frameworks are limited to using hundreds of photon detections at each pixel to mitigate Poisson...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.