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Ferroelectric Detector for Real Time Recording of the Trajectory of Photon, Electron and Other Particle Beams

IP.com Disclosure Number: IPCOM000106060D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Coufal, HJ: AUTHOR [+2]

Abstract

Disclosed are devices for the recording of the trajectory of photon, electron, or other particle beams, and individual high energy particles in two or three dimensions. The simplest detector consists of a thin pyroelectric material with narrow parallel conducting strips deposited on one side and an orthogonal set of conducting strips deposited on the other side. The incident beam or high energy particle deposits a fraction of its energy when it traverses the pyroelectric material, causing a localized transient heating of the pyroelectric. The conducting strips act as electrodes for the detection of the charge that is locally induced via the pyroelectric effect, which is proportional to the energy deposited by the incident radiation. Individual cells in the detector are formed at the junctures of the opposing electrodes.

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Ferroelectric Detector for Real Time Recording of the Trajectory of Photon, Electron and Other Particle Beams

      Disclosed are devices for the recording of the trajectory of
photon, electron, or other particle beams, and individual high energy
particles in two or three dimensions.  The simplest detector consists
of a thin pyroelectric material with narrow parallel conducting
strips deposited on one side and an orthogonal set of conducting
strips deposited on the other side.  The incident beam or high energy
particle deposits a fraction of its energy when it traverses the
pyroelectric material, causing a localized transient heating of the
pyroelectric.  The conducting strips act as electrodes for the
detection of the charge that is locally induced via the pyroelectric
effect, which is proportional to the energy deposited by the incident
radiation.  Individual cells in the detector are formed at the
junctures of the opposing electrodes.  By monitoring the time
dependent voltages of this two dimensional array of capacitors the
location where the beam or particles interact with the detector can
be determined.  The voltage at each capacitor is a direct measure of
the energy deposited by the beam or particle in that particular cell
during a certain amount of time.  This device is, therefore, ideal
for determining the profiles of beams for individual pulses of the
incident radiation.

      A stack of these two-dimensional arrays can be manufactured by
alternately depositing conducting strips and pyroelectric material to
build up a three dimensional detector made of many layers as shown in
the figure.  By using suitable materials for the electordes and the
pyroelectric only a small fraction of the energy of the incident beam
or particle is deposited in one layer.  A complete trace of the path
of the beam or particle is recorded as it passes through the
successive layers of sensing elements.  If the stopping power of one
layer has been determined for the incoming type of radiation, the
energy and momentum of the incident particle can be determined.  By
analyzing the trajectory of t...