X-ray data acquisition systems for Airport Security J M Homer Electron Tubes Ltd.
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Transcript of X-ray data acquisition systems for Airport Security J M Homer Electron Tubes Ltd.
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X-ray data acquisition systems for Airport Security
J M Homer Electron Tubes Ltd
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Electron Tubes Ltd
Specialises in X-ray and light detection systems UK based company Products
X-ray data acquisition systems Light detection modules Photomultipliers
Customers Security systems Instrumentation NDT systems Scientific research (HE Physics and Space)
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Carry-on baggage scanner
Checked baggage scanner
Large baggage or container scanner
Airport security applications
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Carry-on baggage scanner
Linescan system
Checked baggage scanner
CT system
Large baggage or container scanner
Multi-view linescan system
System types
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Personal X-ray scanning
Compton backscatterusing photomultipliers
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Material Thickness
mm
Energy Range
mm
Signal output Signal decay time
Silicon 0.3 5 – 25keV Highest signal, direct conversion
1µs
Gadox (Tb) 140gm/cm2 20 – 100keV Similar to CsI 2 – 3ms
CsI (Tl) 4.5mm 40 – 160keV Best light output
2 components, long decay tail
CdWO4 2.5mm –
30mm
150keV – 9Mev 25% of CsI 20µs
X-ray detectors
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X-ray linescan system
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Single energy and dual energy detectors
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X-ray CT system
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Requirements of data acquisition system
Large number of channels, 2000 to 20000
Sub-millisecond scan time
Wide dynamic range
Digital output
Low noise
Low cost
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XDAS system
charge integrating method
simultaneous data acquisition and read-out
on board sub-sampling and data summation
links to PC via USB2 or PCI-7300A data I/O card
s/w controllable via RS485 interface
system read-out rate 5MB/s
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Single Channel of ASIC
inputfrom
detector analogueoutput
multiplexer
sample & hold2 x 2 line
stores
2 or10 pF
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XDAS module block diagram
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XDAS system block diagram
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XDAS V1X system
One digital board drives 20 detector head boards with 2560 channels
Multiple digital boards allow up to 30000 channels
System read-out rate up to 20MHz
Same capability as original XDAS system
Lower cost
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128channeldetector
array
128channelASIC
signal processing board
XDAS-V1X detector head board
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reset
usersettings
non-volatileRAM
central processingmodule (FPGA)
controlinterface(RS 485)
A to Dconverter
analoguemultiplexer
imagedatastore
20analogueinputchannels
detectorhead boards
computerinterface
(differential)
localinterface
localinterface(logic)
control
data
data
control
local control
sync controls
XDAS-V1X signal processing boardblock diagram
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detectorhead
detectorhead
localbus
localbus
detectorhead
Power
I/O
0V
RS485
signalprocessing
5 MB/s8 Bit
64 channel bank A 64 channel bank A 64 channel bank A
64 channel bank B 64 channel bank B 64 channel bank B
XDAS-V1X system block diagram
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XDM System
modular system of any length 6mm detector pitch suitable for use with high energy applications using Linacs high charge capacity (1000pC) 20-bit output 1 bit of noise high speed serial link to CPU systems designed to order
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summary
modular X-ray data acquisition systems designed for use with linescan and CT X-ray systems
large number of channels fast low noise low cost per channel
digital output can be configured to meet specific requirements
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solutions in light detection