Assessment of the Automation Algorithm for TDR Bridge - Ohio ...

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$Page 1 of 8 Traffic Survey Report 12/29/2006 file://X:\TC\Traffic ...$

Basics Concepts EM Wave v p = c µ ε A TDR system r r A schematic plot of a TDR system Relative Voltage (V) 1.25 0.75 0.25 -0.25 -0.75 K a ⎛ = ⎜ L = ⎜ L = ⎜ ⎝ L a p ⎞ ⎟ ⎟ ⎠ V s/2 2 Apparent Length, L a -1.25 0 1 2 3 4 5 6 7 8 Scaled Distance (m) A TDR waveform EC b 1 ⎛ ⎞ ⎜ V ⎞ = ⎜ V ⎞ s = ⎜ V s = − 1 ⎟ C ⎜ ⎟ ⎝V ⎟ ⎝V ⎟ ⎝V f ⎠ V f 30
Reflection at Interface Reflection coefficient ρ = Air, Ka=1 Z Z 2 2 − + Z Z 1 1 = K K a, 1 a, 1 − + K K a, 2 a, 2 Saturated soil, Ka=20~40 depending on density Water, Ka=81 Change of impedance will cause reflection of EM wave Air Water Sediment TDR sensor for Bridge scour monitoring
Page 1 and 2: ODOT Project Review Session Present
Page 3 and 4: Introduction 1.1 Motivation for Bri
Page 5 and 6: Classification • General Scour
Page 7 and 8: Local Scour • Pier scour and abut
Page 9 and 10: Physical Modeling Parameters relate
Page 11 and 12: Numerical Simulation • 1D simulat
Page 13 and 14: Field observation • A co-operativ
Page 15 and 16: Literature review: scour monitoring
Page 17 and 18: 2.1 Motivation for Scour Instrument
Page 19 and 20: • Lagasse and Price 1997 NCHRP Pr
Page 21 and 22: • Mueller and Landers 1999 PVC-po
Page 23 and 24: National practice of scour monitori
Page 25 and 26: Sonar (cont.) A sonar system for br
Page 27 and 28: Sonar (cont.) • Data Acquisition
Page 29: Time Domain Reflectometry Dowding a
Page 33 and 34: Outline • Introduction • Litera
Page 35 and 36: Experiment Setup and Procedure •
Page 37 and 38: Voltage(V) Test results 0.4 0.0 -0.
Page 39 and 40: 3.2 Algorithms for TDR Signal Inter
Page 41 and 42: Mixing Formula for Electrical Condu
Page 43 and 44: sqrt(Ka)/sqrt(kw) Empirical Equatio
Page 45 and 46: River condition assessment • Elec
Page 47 and 48: Results by Using Design Equation
Page 49 and 50: Scour Estimation Based on Detecting
Page 51 and 52: Sample results 0.01 0 -0.01 -0.02 F
Page 53 and 54: Monitoring of Simulated Scour in Va
Page 55 and 56: Normalized dielectric constant 1.0
Page 57 and 58: Normalized dielectric constant 1.0
Page 59 and 60: TDR measurements of scour for diffe
Page 61 and 62: Scour Monitoring in Water of High E
Page 63 and 64: Dielectric constant by insulated pr
Page 65 and 66: Effect of air bubbles on dielectric
Page 67 and 68: Scour monitoring in water with vary
Page 69 and 70: A Comparison of TDR and Ultrasound
Page 71 and 72: Voltage(V) Results 0.5 0.0 -0.5 -1.
Page 73 and 74: ECb,w(ms/m) Electric conductivity o
Page 75 and 76: Outline • Introduction • Litera
Page 77 and 78: 5.2 Use of FEMLAB for TDR Probe Des
Page 79 and 80: Electric field, Case I 79
Page 81 and 82:
• Effective measured dielectric c
Page 83 and 84:
Sampling area ∫∫ Ω ∑ 100 ×
Page 85 and 86:
5.3 Coated TDR CS605 Moisture Probe
Page 87 and 88:
Lab Evaluation of Strip Scour Senso
Page 89 and 90:
FEMLAB Analysis of the Performance
Page 91 and 92:
Electric potential Sensor in water
Page 93 and 94:
Sampling area, saturate sand Field
Page 95 and 96:
Scour measurement TDR measured scou
Page 97 and 98:
Laboratory Observations and Algorit
Page 99 and 100:
Evaluation of TDR under Various Con
Page 101 and 102:
Future work •Continue to develop
Page 103 and 104:
Acknowledgement • Ohio Department
Page 106:
Connection to another scour monitor
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Assessment of the Automation Algorithm for TDR Bridge - Ohio ...

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