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Chairman :Hung -Chi Yang
Presenter: Han-Yang Liu
Adviser :Dr. Ji- Jer Huang
2016/7/15
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Outline
 Introdution
 Paper Review
 Motivation and Purpose
 Materials and Methods
 Future Works
 References
2016/7/15
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Introduction
 Applications of electrical impedance tomography (EIT)
 oil pipelines
 chemical applications
 fluidized beds
 pneumatic conveying
 trickle bed reactors
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Paper Review
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Paper Review(1)
ac programmable gain amplifier(ac-PGA)
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Paper Review(1)
phase-sensitive demodulation (PSD)
direct digital synthesizer(DDS)
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Paper Review(1)
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Paper Review(1)
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Paper Review(1)
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Paper Review(1)
C(l) the measured capacitances
¯C average capacitance
A capacitance probe consisting of
two parallel plates,2 cm apart, with
16 pairs of electrodes
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Paper Review(1)
 (1) Stratified distribution of Perspex beads.
 (2) Two Perspex rods of 2.5 and 1.5 cm diameter,
positioned near the sensor wall.
 (3) APerspex rod of 2.5 cm diameter, positioned in the
centre.
 (4) A Perspex pipe of 3 and 5 cm internal and external
diameters, respectively, positioned in the centre.
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Paper Review(2)
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Paper Review(2)
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Paper Review(2)
Paper Review(2)
L ?1000
L =1000, 79.8 dB
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Paper Review(2)
All the images are obtained using LBP algorithm
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Paper Review(2)
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Paper Review(2)
Paper Review(2)
 SNR of this system is up to 79.8 dB
 Real-time imaging speed is about 280 frames/s
 Dual-frequency model with LBP algorithm
 High real-time and smaller average error
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Motivation and Purpose
 Design the real-time EIT system based
on FPGA
 Make the simulation pattern including
the tank and the tube.
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Motivation and Purpose
Our module1 block
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Motivation and Purpose
Our module2 block
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Motivation and Purpose
Our module3 block
Materials and Methods
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Materials and Methods
voltage modulation

Voltage modulation using AD5453.
 Interface is SPI .
 multiplying
bandwidth is
12 MHz.
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Materials and Methods
Circuit of voltage modulation
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Materials and Methods
VCCS

VCCS using Howland circuit.

OPA using THS4021.
 Bandwidth is 350MHz.
 Slew rate is 470V/μs.
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Materials and Methods
Circuit of Howland
I out
Vin R2

R4b R1
Rout
R1 R4b ( R3  R4 a )

R2 R3  R1 ( R4 a  R4b )
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Results
Signal of VCCS output (2)
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Materials and Methods
 Stratix IV GX EP4SGX230
 228,000 logic elements (LEs)
 17,133K total memory Kbits
 1,288 18x18-bit multipliers
blocks
 2 PCI Express hard IP blocks
 744 user I/Os
 8 phase locked loops (PLLs)
Materials and Methods
Materials and Methods
Materials and Methods
Future Works
 Papers review
 Based to FPGA realize of Electrical Impedance
Tomography System
 Up to 32 channels
2016/7/15
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References
 From Ziqiang Cui1, HuaxiangWang, Zengqiang Chen1,
Yanbin Xu andWuqiang Yang, “A high-performance digital
system for electrical capacitance tomography” Meas. Sci.
Technol. 22 (2011) 055503 (10pp)
 From S. Xin H. Wang, “Extensible electrical capacitance
tomography system for gas–liquid two-phase flow” IET
Image Process., 2011, Vol. 5, Iss. 5, pp. 500–507