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.
We present a Digital Pulse Processor (DPP) that is pocket-size, high performance, and cost-effective for applications of energy measurements that range from X to Gamma-ray spectroscopy. The DPP is compatible with many types of detectors and preamps with continuous and pulsed reset. Main features of the instrument are the extreme compactness and the portability that make it suited both for laboratory...
In low-energy nuclear reactions of astrophysical and fusion interest the spatial- and time-correlated detection of two and more reaction products can be a useful tool to discern reaction mechanisms such as investigate reaction channels, measure angular distributions of reaction products and determine partial reaction widths. For this purpose we assembled a configurable array of Timepix detectors with...
The present work employs MSND technology as a 3He gas-tube direct-replacement technology. The MSND-based Helium Replacement (HeRep) is a single instrument utilizing thirty 4-cm2 active area MSNDs to directly replace 3He-based proportional neutron counters. The HeRep Mk II prototype yielded 102.71±0.84% of the neutron detection efficiency of a 4-atm Reuter Stokes 3He gas-filled detector with the same...
A digital filter is presented that adapts automatically to the shape of a nuclear signal to stabilise against temperature induced peak shifting. The filter is called cognitive as it extracts the information about the exponential decays and determines the scintillation material intrinsically. The latter is done with a pole deconvolution approach.
A method is described to automatically generate spectrum reference data for radioisotope identification devices respecting a detectors physical individuality. It extracts the peak shape and non-proportionality characteristics of scintillation and CZT detectors. The representation of these quantities is done with evolutionary ensembles, groups of N-dimensional autonomous points, which are propagated...
Currently four complete setups have been assembled and used for soft- and firmware development in order to improve stability and functionality. Noise and performance measurements were made in order to characterize the hardware. A full article with detailed descriptions about the demonstrator hardware and measurements will be submitted to the Transaction on Nuclear Science (TNS).
The ability to detect the presence of radioactive sources and Special Nuclear Materials (SNM) is of extreme importance for homeland security efforts. Today, we face terrorist threats in the form of explosive nuclear devices and Radiation Dispersal Devices (RDDs). The ability to remotely locate and identify the materials used to create these devices is imperative in the interdiction of terrorist threats...
Solar flares are the most powerful events in the solar system and the brightest sources of X-rays, often associated with emission of particles reaching the Earth and causing geomagnetic storms, giving problems to communication, airplanes and even black-outs. X-rays emitted by accelerated electrons are the most direct probe of solar flare phenomena. The Micro Solar-Flare Apparatus (MiSolFA) is a proposed...
A fully programmable digital instrument for the emulation in real-time of signals with bandwidth up to 400 MHz from generic radiation detection systems is presented. The instrument is not a pulse generator of recorded shapes but a synthesizer of random pulses compliant to programmable statistics for height and starting time of events. Completely programmable procedures for emulation of several noise...
We present the progress performed in the development of a digital fully programmable emulator of radiation detectors and front-end electronics of image acquisition systems. The instrument has 64 independent channels with the capability of growing an image that has been a-priori programmed. The growth faithfully emulates the real-time behavior of an acquisition array constituted by 64 detectors, also...
We present the selected results of research-and-development activities focused on improving conventional and creating novel passive quasi-optical components of submillimeter-wave instrumentation. Realized as high-performance single- and multi-layered metallized microstructures of sub-wavelength topology, the components include band-pass filters, non-profiled focusing devices, thin-film phase and polarization...
Polarimetric-hyperspectral imaging brings two traditionally independent modalities together to potentially enhance scene characterization capabilities. This could increase confidence in target detection, material identification, and background characterization over traditional hyperspectral imaging. In order to fully exploit the spectro-polarimetric signal, a careful calibration process is required...
We report our recent work to improve a number of performance attributes of “KIDcam,” a passive THz imaging camera based on frequency multiplexed Lumped Element Kinetic Inductance Detectors (LEKIDs.) The array operates at 250mK but the entire instrument is liquid cryogen-free and can be operated remotely and automatically. It offers high sensitivity throughout the THz region with video rate frame capture...
X-Spec is a multi-beam, R=400–700 survey spectrometer covering 190–520 GHz under development for CCAT. It measure the bright atomic fine-structure and molecular rotational transitions that cool galaxies' interstellar gas, in particular, the 158 μm rest-frame [CII] transition which is accessible from z=9.5 to z=3.5, With the wide bandwidth and multi-object capability, X-Spec/CCAT will be more powerful...
Upward-looking sonar (ULS) instruments have become the primary source of data for high resolution and long duration measurements of sea ice drafts to support engineering requirements for oil and gas exploration projects in Arctic and other ice-infested areas. ULS instruments, in the form of ASL's Ice Profiler Sonar (IPS), provide accurate measurements for ice draft on a continuous year-long basis...
Hyperspectral Imager Suite (HISUI) is a next-generation Japanese sensor that is planned to be on board in 2017 or later. HISUI is composed of two sensors; one is a hyperspectral sensor, and the other is a multispectral sensor. Synergic operation of these instruments acts an important role in the future spectral-spatial data. Regarding with Hyperspectral sensor, the onboard data correction and compression...
In this paper we present the comparison in terms of acquisition speed between octave bandwidth radiometric imagers that are based either on antenna coupled or bolometer coupled direct detection instruments. The considered configurations are all characterized by dielectric lenses which can be coupled to bolometric focal planes, double slot feeds or leaky wave enhanced feeds. The acquisition speeds...
This paper presents a design for loss of signal detection between synchro and Synchro-to-Digital-Converter. The loss of signal over the rotor and stator terminals of synchro is indicated by Light Emitting Diodes (LED). The proposed technique performs the generation of zero crossing outputs for the corresponding rotor and stator signals of the synchro. The monoshots takes these zero crossing signals...
This paper presents the design and integration of an adaptive controller for CIRIS (Compositional InfraRed Interferometric Spectrometer) on a stand-alone field programmable gate array (FPGA) architecture. CIRIS is a novel take on traditional Fourier Transform Spectrometers (FTS) and replaces linearly moving mirrors (characteristic of Michelson interferometers) with a constant-velocity rotating refractor...
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.