Paul Scherrer Institut

Helmholtz-zentrum Dresden-rossendorf E.v.

Eth Zurich

Westinghouse Electric Sweden Ab

Horst-Michael Prasser

Eckhard Schleicher

Uwe Hampel

Marco Cortesi

Volker Dagendorf

Robert Zboray

Marco Jose Da Silva

Volker Dangendorf

Jean-Marie Le Corre

Lukas Robers

Marco José Da Silva

An energy-sensitive imaging detector for fast-neutrons includes energy-selective radiator foil stacks converting neutrons into recoil protons. The foils are separated by gas-filled gaps and formed of two interconnected layers: a hydrogen-rich layer such as a polyethylene layer for neutron-to-proton conversion, and a metal foil layer, such as an aluminum layer, defining a proton energy cut-off and limiting a proton emission angle. Energetic recoil protons emerging from the radiator foil release electrons in surrounding gas in the gaps. An electric field efficiently drifts the electrons through the gaps. An electron detector with position sensitive readout, based on Micro-Pattern Gaseous Detector technologies (such as THick Gaseous Electron Multipliers&#x2014;THGEM) or other measures provides electron amplification in gas. The charge detector has a dedicated imaging data-acquisition system detecting the drifted electrons thereby sensing the position of the original impinging neutrons.

Energy-sensitive fast neutron imaging detector and method for energy-sensitive fast neutron detection

Disclosed is an arrangement for quickly measuring the phase distribution or the component distribution in a flow cross section for substance mixtures also of a non-conducting type by measuring the complex electrical admittance. Said arrangement essentially features the following: at least one sine wave generator () which is mounted upstream from the transmitter electrodes () of the excitation level and applies an alternating voltage to the transmitter electrodes (); current-to-voltage converters () which are mounted downstream from the receiver electrodes (), amplify the alternating current that flows from at least one excitation electrode () through the medium to the receiver electrodes (), and convert said alternating current into a voltage signal; filter groups () and vector voltmeters () which are mounted downstream from the current-to-voltage converters () and allow the complex signal ratio U/Uto be metrologically detected.

Grid sensor for the two-dimensional measurement of different components in the cross section of a multiphase flow

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Nussbaumen, Switzerland

Horst-Michael Prasser