ims based explosive detector
DESCRIPTION
IMS Based Explosive Detector. Abhinav Biswas , CSE , GET - 140811 Rahul Saxena , ECE , GET - 140935 Nishant Kumar Sharma, ECE , GET - 140921. Presented By:. Corporate Research and Development , CR&D Electronics Corporation Of India Limited, Hyderabad. What is IMS ?. - PowerPoint PPT PresentationTRANSCRIPT
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IMS BasedExplosive Detector
Presented By: Abhinav Biswas, CSE, GET - 140811 Rahul Saxena, ECE, GET - 140935 Nishant Kumar Sharma, ECE, GET -
140921
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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What is IMS ? An analytical technique to identify gaseous
Ionized molecules based on their Mobility or Drift velocity.
Ion Mobility Spectrometry:
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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What is IMS ?Ion Mobility
Spectrometry: Drift Tube
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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Objective
Collect & Analyze drift tube output Detect the sample material
Explosives like RDX, TNT.
Data Acquisition & Display Unit :
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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Schematic Overview
Drift TubePre-Amplifier
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Input Current
In picoamperes (pA)
Output Signal In millivolts (mV)
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Schematic Overview
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
ADC
Pre-Amplifier
Analog to Digital Conversion
THS1206 ADC by Texas Instruments
12 bit, 6 MSPS Conversion Clock
100 kHz Filters
Drift Tube
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AT91SAM9263 by Atmel
ARM9 Architecture 32-bit RISC 256 MB NAND Flash 64 MB RAM RS232 Serial Port
Schematic Overview
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
ADC
Pre-AmplifierDrift Tube
ARM
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Schematic Overview
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
ADC
Pre-AmplifierDrift Tube
ARM LCD
Touch Screen Display
3’5” LCD 320 X 240 Resolution Resistive Touch
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Data AnalysisUsing Matlab :
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
ADC Output data Containing Noise
Window Size – 50 Moving Average
Algorithm
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Filter RequirementAliasing Problem:
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Nyquist Criteriafs >= 2 * fm
Anti-Aliasing Low-Pass Filter
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Filter Selection
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
High Order Butterworth
NoLinear Phase
Ripple ok
Narrow Transition
Band
Yes Yes
FIR Other Filters
No No
Yes
Low Order Butterworth
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Filter DesignButterworth Filter:
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Maximally flat pass-band response Better rate of attenuation Good all-around performance Easy to implement
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Filter DesignUsing LTC 1064-2 IC :
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
D 2
1 N 5 8 1 7 M / C Y L
D 3
1 N 5 8 1 7 M / C Y LC 1C
C 2C
1
2
3
4
5
6
7 8
9
10
11
12
13
14
LTC 1064-2
NC
NC
NC
NCVin
AGND
AGND
V+
RinA
Vout
50/100
fclk
V-
OUTCV+ V-
V+
OUTPUT
8th order Butterworth filter (70-100kHz fc)
Variable Cut-off frequency – by changing clock
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Filter DesignClock Generation :
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
555 Timer IC 50% Duty-cycle Variable clock
frequency – by changing Resistance value
C 1C
C 2C
D 1
D I O D E
R 1R E S I S TO R
R 2R E S I S TO R
1
2
3
4
5
6
7
8
555 TIMER IC
Vcc Reset
Discharge
Threshold
Trigger
Ground Control
Out f(clk)
180 pF
10 nF
Vcc
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Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Filter DesignUsing Sallen-Key Filter: Why Sallen-Key
Topology ? 8th Order
Butterworth Low-Pass Filter
Very high Q-Factor – 2.5
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Porting Linux on the ARM board U-Boot Bootstrap Kernel 2.6.30 Root File System
Development of device drivers for ADC IMS App using Qt 4.5
Qwt library for Graphs Cross-Compilation of Qt & Touch-screen
libraries
SoftwareOperations:
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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IMS AppHow it works : Graph Plot of
sample dataPeak DetectionCalculation of
Drift Time
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
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Graph Plot Moving Average
AlgorithmWindow Size –
50 samples
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Removal of Glitches :
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Graph Plot Moving Average
AlgorithmWindow Size –
50 samples
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Removal of Glitches :
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Graph Plot Step-by-Step
ProcessWindow Size –
50 samplesPeak of each window
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Peak Detection :
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Graph Plot Step-by-Step
ProcessWindow Size –
50 samplesPeak of each windowChange of sign/slope
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Peak Detection :
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Conclusion
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Analysis of ADC data Filter design Implementation in hardware
Development of IMS App Moving Average algorithm Peak detection algorithm
Ongoing Work:
Future Work: Final Deployment Android version
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Thank You !
Corporate Research and Development , CR&DElectronics Corporation Of India Limited, Hyderabad
Special Thanks to :Smt. Lakshmi Latha SM, CR&DECIL Hyderabad