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High lutetium content LGSO [Lu1.8Gd0.2SiO5:Ce] with decay time constants in the range 30–45 ns were introduced by Hitachi Chemical Ltd. (Japan) around 2006. At first an experimental development, mass production has now been established and mature 90%Lu LGSO scintillators with stable characteristics have become available. The aim of this work was to assess the scintillation characteristics of the current...
We fabricated a transition-edge sensor (TES) microcalorimeter for spectroscopic measurements of L X-rays emitted by transuranium (TRU) elements. A Pu L X-ray energy spectrum was obtained by irradiation with L X-rays emitted by a 244Cm source to the TES microcalorimeter. The energy resolution was evaluated to be 64 eV at the full width at half maximum (FWHM) for L X-rays at 14.28 keV. The obtained...
In the comparative measurements, done in the same experimental conditions, various samples of NaI:Tl, CsI:Na, BGO, GSO, LSO, LuAG:Pr, LaBr3 and GAGG scintillators were tested. The temperature dependence of the light output, energy resolution and decay time constants of the light pulses were measured over the temperature range of −30 to 50 °C. The XP2020 photomultiplier was used with two different...
Super-Kamiokande (SK) is a 50-kiloton Water Cherenkov detector and. it is able to detect a large number of supernova burst neutrinos with its large target mass.
In order to keep a low false alarm rate of 1/year• kilometre, and in order to launch the fire alarm correctly in the initial stage of such a fire as occurred in a car, a method of threshold selection for a fire alarm system particularly applied in traffic tunnels is discussed in this thesis. Each fire alarm detector randomly collects environmental temperature rise gradients (TRG) and...
High quality Mn-Co-Ni-O (MCN) spinel films are prepared on Al2O3 substrate by RF magnetron sputtering (RF) and chemical solution deposition (CSD). The microstructural characterizations reveal the films present excellent crystallization and compact surface. The variable temperature electrical results show the films have temperature coefficient of resistance (TCR) of −3.8 %/K at 295 K. Based on the...
This paper presents a 153–162 GHz pre-amplified power detector receiver based on a 250 nm InP/InGaAs/InP double heterojunction bipolar transistor (DHBT) process. The front end consists of a double slot antenna followed by a five stage low noise amplifier and a detector. The receiver is characterized through measurements of its response to broadband hot and cold terminations. A simplified method is...
We present measurements from a prototype array of superconducting kinetic inductance detectors optimized for 150 GHz radiation and commercially fabricated from 20 nm aluminum films on silicon wafers.
Terahertz (THz) photo-detectors, consisting of a r graphene nano-bridge and a plane antenna have been fabricated c and characterized. Hot electrons in graphene-bridge (GB) are generated after absorbing the incident THz photons. We measured the amplified thermal noise power from hot electrons to sense the absorbed THz power. By using this noise-thermometric technique, a THz photodetector with temperature...
The radio-frequency damage effects of electro-explosive device are considered based on the transmission line model and the non-Fourier heat conduction model. The detector voltage method for high frequency induced voltage and optic radiation method for transient temperature rise are considered. The useful conclusions that the detector voltage reaches maximum when the length of pin is an integral number...
We have measured the spectral response of sensitive Transition Edge Sensors (NEP ∼ 10−18 W/√Hz) in the frequency range from 1 to 10 THz. The TES sensors have been developed for the SAFARI instrument on SPICA and operate at 70 mK. The sensor is placed in a horn-coupled integrating cavity. We have developed a system with a light pipe that couples radiation from a room temperature Fourier Transform Spectrometer...
Properties of antenna-coupled microbolometers optimized for room temperature 300 GHz and 600 GHz resonant frequency detection is reported. Dipole antenna placed on freestanding SiN membrane is used to couple THz radiation power to the titanium-based thermo-resistor. We demonstrate that antenna-coupled micro-bolometers can be well suited for beam profile imaging of the THz pulses emitted by the photoconductive...
We have carried out a terahertz (THz) passive measurement of high-Tc superconductive materials down to liquid nitrogen temperature at 1.5–2.5 THz using a 4 K-cryocooled stressed Ge:Ga photoconductive detector. Using the calibration line, which gives the relation between THz signal emitted from sample, emissivity and temperature, we have derived the temperature-dependent THz emissivity of superconductive...
Based on ARM processor and WinCE embedded systems, a detector design is provided for some certain special equipment temperature controller, as well as the relevant hardware and software. In software design, the operating system is customized, driver for hardware is programmed and testing data real-time display is achieved through multi-threading technology with extra data saving and failure analysis...
Infrared Guidance Hardware-in-loop Simulation technology has great significance In the aerospace. Further research of the simulation system had been made by many institutions and scientists both at home and abroad. In this text, based on the infrared theory and the optical configuration of infrared hardware-in-loop simulation system, the equivalent model of target and background infrared radiation...
The surface of Mercury has long been known to be low in ferrous iron. Spectral reflectance data from the MESSENGER spacecraft do not show a ferrous absorption band near 1 μm, complicating mineralogical analysis of Mercury's surface. With careful calibration, however, these data can yield new constraints on the maximum amount of ferrous iron that can be present in the silicates.
Radiation thermometry is one of the important ways to obtain target temperature, which mainly includes dual-waveband colorimetric temperature measurement. The precision is limited by atmospheric transmittance and the air path radiation when infrared signature of a target measured in the atmosphere. To increase the precision, a correction-based dual-waveband color comparison thermometric method is...
This presentation describes on-wafer characterization of GaAsSb/InAlAs/InGaAs tunnel diodes for direct detection in 220–330GHz band. Voltage sensitivity above 1000V/W was measured in 0.8μm×0.8μm mesa device at room temperature. The detectors demonstrated enhanced temperature stability of the characteristics compared to zero-bias Schottky barrier diodes. The estimated variations of the zero-bias sensitivity...
The Large High Altitude Air Shower Observatory (LHAASO) project aims to search the origin of galactic cosmic rays above 30TeV with high sensitivity and wide spectrum, it's a dedicated instrument made by 4 sub-detector arrays. The square kilometer complex array (KM2A) consists 5635 scintillation electron and 1221 muon detectors covering the area of 1.2Km2. To guarantee the angular resolution of reconstructed...
In modern particle accelerators RF phase detectors have to fulfill high demands on the stability and the accuracy to meet the goals of state-of-the-art synchronization systems. Especially challenges are those cases where the RF signal phase shift accuracy must be measured with fs-accuracy for several hours over the full 2π phase detection range. In these cases special measures on the components non-linearities...
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