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St. Petersburg State Polytechnical University (SPbSPU). Radiophysics Department, Ground Penetrating Radar (GPR) Laboratory. Director: Evgeni E. Svechnikov (Ph.D.) Researchers: Andrei A. Belov Georgi P. Zhabko Pavel A. Krinski. - PowerPoint PPT Presentation
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St. Petersburg State Polytechnical University (SPbSPU)Radiophysics Department,
Ground Penetrating Radar (GPR) Laboratory
[email protected] http://radio.rphf.spbstu.ru/a263/a263.htm
Director:Evgeni E. Svechnikov (Ph.D.)
Researchers:Andrei A. BelovGeorgi P. ZhabkoPavel A. Krinski
UWB Ground Penetrating Radars (GPR)
GPR for rebar detection in concrete (ptofile)
GPR for rebar detection in concrete (map)
Monument 1000-years of Russia (Novgorod)
3-D GPR Image (monument, Novgorod, Russia)
GPR maps (17-th century church, Vladimir, Russia)
GPR Data Migration (6 pipes, right – raw data, left – migrated data)
Antarctic GPR (glaciers, subglacial lakes)
Antarctic GPR (subglacial lake Vostok)
Nondestructive Evaluation (NDE), Eddy-Current
Low Frequency Eddy-current Testing of Pipes (experiment)
Low Frequency Eddy-current Testing of Pipes (experiment)
Eddy-current Testing - Magnetic Field 3-D Images Showing Various Defects
Nondestructive Evaluation (NDE), Microwaves
Millimeter Wave Nondestructive Testing (NDT), Composites
Millimeter Wave Nondestructive Testing (NDT), Composites
Верхний слой стеклопластика
Гофра (стеклопластик, 1.5 мм)
Заполнитель
16
Углепластик
48 (
45)
3 (2
)
70
48
Нижний слой стеклопластика
2(2.
5)
0
Клей
Millimeter Wave Nondestructive Testing (NDT), Composites
Millimeter wave crack detector
Metal
Die
lect
ric
Millimeter Wave Radars
Millimeter Wave Short Range Radar
Millimeter Wave Short Range Radar (objects)
Millimeter Wave Short Range Radar (detection)
Prototype Software for Coastal and Marine Millimeter Wave Radar
Prototype Software for Coastal and Marine Millimeter Wave Radar
UWB Pulse Technology
UWB Pulse Examples1 ns pulses
T (0 - 3 ns)
A
1
1
gmono i( )
gmonod i( )
0
0.1
0.9
3 N3 N i
Frequency spectrum (1ns pulses, 0-2 GHz)
F ( 0 - 2 GHz)
S(F)
0.138
0
gmonovectfft k
gmonodvectfft k
2000 k
SRD, 100ps/div Transistor, 2ns/div
UWB Pulse Generator (Spark Gaps)
-3 kV
Output
SG1SG1SG1
R1
L1C1
R2
L2
R1
L1C1
R2
L2
R1
L1C1
R2
L2Stage 1 Stage 2 Stage 3
Rstage
UWB Pulse Antenna (Experiment)
SWR
Tx Antenna
Emax
V/m
UWB Pulse Array (x3)
Antenna Research
Ultrawideband GPR Antenna
270
430
140
140
320
0-50
48
700
78
Ultrawideband GPR Antenna
Antenna Input SWR
1
1.5
2
2.5
3
100 150 200 300 400 500 600 700 800 1000
Frequency, MHz
SW
R
air gap 5 cm, dry sand, eps=3
air gap 5 cm, concrete, eps=8
air gap 0 cm, concrete, eps=8
Ultrawideband (UWB) GPR antenna testing
24 GHz Monopulse Microstrip Array
24 GHz Monopulse Microstrip Array
24 GHz Monopulse Microstrip Array
Wideband Horn Antenna
Wideband Horn Antenna (10, 24, 35 GHz)
-15
-12
-9
-6
-3
0
-45 -35 -25 -15 -5 5 15 25 35 45
26 Ghz
26 Ghz(calc.)
33.4 Ghz
33.4 GHz(calc.)
Bluetooth Antenna (Simulation)
Bluetooth Antenna (Experiment)
Interdigitated Capacitor
1 2C
Interdigitated Capacitor (Experiment)
10 15 20 25 30 35 400
0.2
0.4
0.6
0.8
1Reflect ion Coefficient S11
F, GHz
1.00
0
S11exp
S11sim
S11LC
4010 f
Interdigitated Capacitor
5 10 15 20 25 30 35 40Frequency (GHz)
S11S12
0
0.2
0.4
0.6
0.8
1
|S[1,1]|emsim
|S[1,2]|emsim
5 10 15 20 25 30 35 40Frequency (GHz)
S11S12
0
0.2
0.4
0.6
0.8
1
|S[1,1]|emsim
|S[1,2]|emsim
5 10 15 20 25 30 35 40Frequency (GHz)
S11S12
0
0.2
0.4
0.6
0.8
1
|S[1,1]|emsim
|S[1,2]|emsim
Measurement of Electrical Properties of Materials
Measurement Of Electrical Properties Of Concrete
0 6 108 1.2 109 1.8 109 2.4 109 3 10960
45
30
15
0
Hz
dB
S11exp j
S11th f11 jtgm m
f11 j
F, Ãö
ýêñï åðèì åí ò
òåî ðèÿ
S11, äÁ
Electrical Properties Of NaCl Water Solution Vs. Frequency (GPR Lab, Experiment)
1
10
100
1000
10000
0 500 1000 1500 2000
f, MHz
ε"
0.1%
0.2%
0.5%
1%
2%
3.5%
Solution #2ρ=0.185 Ом·м at 25ºC, 35g NaCl, 1000g water
0
500
1000
1500
2000
2500
3000
10 100 1000
frequency, MHz
ε'×
10
, ε"
0
200
400
600
800
1000
1200
1400
Γ,
dB
/m
ε'×10, 25⁰C
ε", 25⁰C
ε'×10, 35⁰C
ε", 35⁰C
Γ, 25⁰C
Γ, 35⁰C
Various Projects
Fiber Optic Vibration Sensor
Human Digging Signal Fast Car Signal
Custom Computer Interface (PLC) for a Pulse Generator (hardware, software)
St. Petersburg State Polytechnical University (SPbSPU)Radiophysics Department,
Ground Penetrating Radar (GPR) Laboratory
[email protected] http://radio.rphf.spbstu.ru/a263/a263.htm
Director:Evgeni E. Svechnikov (Ph.D.)
Researchers:Andrei A. BelovGeorgi P. ZhabkoPavel A. Krinski
