scholarly journals Active scour monitoring using piezoelectrics and ultrasonic time-domain reflectometry to detect a soil interface

2021 ◽  
Author(s):  
Morgan Funderburk ◽  
Michael D. Todd ◽  
Anton Netchaev ◽  
Kenneth J. Loh
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Scour Monitoring ◽  
Ultrasonic Time ◽  
Soil Interface

Active Scour Monitoring using Ultrasonic Time Domain Reflectometry of Buried Slender Sensors

2021 ◽  
Author(s):  
Morgan Funderburk ◽  
Jamie Tran ◽  
Michael Todd ◽  
Anton Netchaev ◽  
Kenneth J Loh
Keyword(s):  
Time Domain ◽  
Extreme Event ◽  
Lamb Waves ◽  
The United States ◽  
External Pressure ◽  
Time Domain Reflectometry ◽  
Scour Monitoring ◽  
Ultrasonic Time ◽  
Bridge Failure ◽  
Soil Interface

Abstract Local scour is a growing cause of bridge failure in the United States and around the world. In the next century, the effects of climate changes will make more bridges susceptible to scour failure more than ever before. This study aims to harness the spatially continuous monitoring capabilities of ultrasonic time-domain reflectometry to detect a soil interface for the purposes of scour monitoring. In this study, a long, slender plate is coupled with two flexible piezoelectric devices that propagate Lamb waves along the length of the plate to form the scour sensor. The sensor was tested for sensitivity to external pressure using metal weights, and was able to detect the position of the pressure up at a length of up to ~ 20 feet. The sensor was tested under simulated scour conditions, being buried in sand at various depths. The results show that the Lamb wave scour sensor is capable of reliably detecting a soil interface at 1 ft intervals. The scour sensor was also able to detect uncompacted soil interfaces, which is important considering the issue of scour hole refill following an extreme event.

scholarly journals A Double Transducer for High Precision Ultrasonic Time-Domain Reflectometry Measurements

Sensors ◽  
2015 ◽  
Vol 15 (7) ◽  
pp. 15090-15100 ◽  
Author(s):  
Sam Stade ◽  
Tuomas Hakkarainen ◽  
Mari Kallioinen ◽  
Mika Mänttäri ◽  
Tuure Tuuva
Keyword(s):  
High Precision ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Ultrasonic Time

Monitoring membrane biofouling via ultrasonic time-domain reflectometry enhanced by silica dosing

2013 ◽  
Vol 428 ◽  
pp. 24-37 ◽  
Author(s):  
S.T.V. Sim ◽  
S.R. Suwarno ◽  
T.H. Chong ◽  
W.B. Krantz ◽  
A.G. Fane
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Membrane Biofouling ◽  
Ultrasonic Time

In situ monitoring of wastewater biofilm formation process via ultrasonic time domain reflectometry (UTDR)

2018 ◽  
Vol 334 ◽  
pp. 2134-2141 ◽  
Author(s):  
Jinfeng Wang ◽  
Hongqiang Ren ◽  
Xianhui Li ◽  
Jianxin Li ◽  
Lili Ding ◽  
...  
Keyword(s):  
Time Domain ◽  
Formation Process ◽  
Biofilm Formation ◽  
Time Domain Reflectometry ◽  
In Situ Monitoring ◽  
Ultrasonic Time
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