4.4 Ultrasound in through-transmission
Title: 4.4 Ultrasound in through-transmission
Author(s): C. U. Grosse, H. W. Reinhardt, A. T. Herb
Paper category : book
Book title: Advanced Testing of Cement-Based Materials during Setting and Hardening - Final Report of RILEM TC 185-ATC
Editor(s): H.W. Reinhardt and C.U. Grosse
Publisher: RILEM Publications SARL
Publication year: 2005
Pages: 163 - 190
Total Pages: 28
Nb references: 54
Abstract: The principle of the transmission method is shown in Fig. 1. A pulse is generated at one surface of the specimen and the according wave is travelling through the material and picked up at the other side. The pulse can be generated mechanically, for instance by an impactor, and recorded by a piezoelectric receiver, or the pulse can be imposed by an ultrasound (US) transmitter. In both cases the incident pulse and the transmitted pulse are recorded, converted to a digital signal and stored in a memory for further or immediate evaluation.
The physical principles of the sound transmission are summarized in chapter 4.1. However, there are fundamental differences between diverse methods how the waves are excited, which wave types are used and also regarding the set-up of sensors at or in the material under test. A special treatment needs obviously the use of shear waves, what can be combined also with a vibrator for wave excitation. This approach is described in more detail in chapter 4.5. This chapter is focused to the description of transmission techniques using compressional waves. A special case should be addressed first, what is the use of dipping techniques.
Online publication: 2006-09-22
Publication type : full_text
Public price (Euros): 0.00