scholarly journals Concrete Infill Monitoring in Concrete-Filled FRP Tubes Using a PZT-Based Ultrasonic Time-of-Flight Method

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2083 ◽  
Author(s):  
Mingzhang Luo ◽  
Weijie Li ◽  
Chuang Hei ◽  
Gangbing Song
Keyword(s):  
Time Of Flight ◽  
Ultrasonic Time ◽  
Frp Tubes ◽  
Time Of Flight Method

scholarly journals Low-cost Solutions for Velocimetry in Rotating and Opaque Fluid Experiments using Ultrasonic Time of Flight

2021 ◽  
Author(s):  
Fabian Burmann ◽  
Jerome Noir ◽  
Stefan Beetschen ◽  
Andrew Jackson
Keyword(s):  
Acoustic Waves ◽  
Flow Measurement ◽  
Low Cost ◽  
Time Of Flight ◽  
Zonal Flow ◽  
Gravitational Acceleration ◽  
Complex Flow ◽  
Ultrasonic Time ◽  
Theoretical Predictions ◽  
Complex Flow Structure

AbstractMany common techniques for flow measurement, such as Particle Image Velocimetry (PIV) or Ultrasonic Doppler Velocimetry (UDV), rely on the presence of reflectors in the fluid. These methods fail to operate when e.g centrifugal or gravitational acceleration leads to a rarefaction of scatterers in the fluid, as for instance in rapidly rotating experiments. In this article we present two low-cost implementations for flow measurement based on the transit time (or Time of Flight) of acoustic waves, that do not require the presence of scatterers in the fluid. We compare our two implementations against UDV in a well controlled experiment with a simple oscillating flow and show we can achieve measurements in the sub-centimeter per second velocity range with an accuracy of $\sim 5-10\%$ ∼ 5 − 10 % . We also perform measurements in a rotating experiment with a complex flow structure from which we extract the mean zonal flow, which is in good agreement with theoretical predictions.

Attempts to measure ion mobilities in EHD liquids by the time-of-flight method

2014 ◽  
Author(s):  
Kengo Itoh ◽  
Takashi Yamazaki ◽  
Kiyoshi Takamoto ◽  
Ryoichi Hanaoka ◽  
Yuta Katagiri ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Time Of Flight Method
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