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Technical Discussions
S.G.N.Murthy
R & D
Structural Engineering Research Centre, India, Joined Oct 1999, 1

S.G.N.Murthy

R & D
Structural Engineering Research Centre,
India,
Joined Oct 1999
1
07:43 Jun-16-1999
Ultrasonic Pulse Velocity measurement on Vibrating Structures

What is the effect of ultrasonic pulse velocity measurement on
concrete structures when they are vibrating due to the machinary
operating. How does the waves produced by the vibrating system
affect ultrasonic pulse transit time measurement. I would like to
have any relevant details to solve the above problem
S.G.N.Murthy
Scientist
Structural Engineering Research Centre
Tharamani
Madras
India - 600 113
Email : elcA@cssercm.ren.nic.in
sgnmurthy@yahoo.com


 
 Reply 
 
Dipl.-Ing. Martin Heinz
Dipl.-Ing. Martin Heinz
09:33 Jun-16-1999
Re: Ultrasonic Pulse Velocity measurement on Vibrating Structures
The affect is depending on the acoustic spectrum of the emissions caused by the vibrating machine. If the signal to noise ratio is so good, that the received pulse can be clearly detected, there is no affect to the measurements. Otherwise I would propose to send a Barker-code modulated sequence of sinusoid bursts and use a correlation algorithm for detecting the modulated signal out of the noise. This is a method for increasing very much the measurement reliability.




 
 Reply 
 

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