Post on 22-Feb-2016
description
Domestic Nuclear Detection Office (DNDO)
Networking Radiation Sensor Systems
NITRD Workshop
September 20, 2012
Richard Vojtech, Ph.D.Principal Deputy Assistant DirectorTransformational and Applied Research Directorate Domestic Nuclear Detection Office
The Questions
1. Will a networked system of portable radiation detectors outperform the same number of individual detector operating independently?
2. Will the networked system improve the ability to: detect anomalous radioactive materials? locate the materials? identify the materials?
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The Program Goal
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To demonstrate advanced technologies that improve the ability to detect, localize, and identify radiological sources by combining data from multiple radiation detector nodes.
Key Questions:
• How does the performance of the ensemble compare to that of the individual detectors?
• What are the strengths and weaknesses of each system approach?
• Do trends in the data suggest which types of scenarios will benefit the most from a tightly coupled network?
“Intelligent” Radiation Sensor System
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Advanced algorithms combine the radiation, spatial, and temporal information from multiple sensors to make a collective assessment about the presence and location of radiological sources
N2
N1
N3
N4
N5WirelessComms
Sensor Array
Data Fusion Algorithms
mt
mt+1
mt+2
Data Packet
~1 Hz
• Energy Spectrum • Sensor Position/Orientation• Timestamp
Detector Devices
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General Electric
Passport Systems
Smiths Detection
System Characterization
Subsetting
2 rings6 quadrilaterals
7 triangles
Subsets
2 rings6 quadrilaterals
7 triangles
Detector Pattern: Spiral + Rings
Movable Track
2”x2” NaI (18)Alt DD (4)
command trailers
background step area
open “field” area
Initial Impressions from a Networked System
In simple cases IRSS shows benefits of networking for detection and agrees well with theoretical expectations
Networking can provide reduction in false alarms at the system level compared to a collection of individual sensors
Tracking of moving sources (even with a single sensor) was achieved with non-directional sensors
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