ABSTRACT Full Text

This paper summarizes some of the major aspects of precision ultrasonic thickness gauging. Ultrasonic nondestructive testing (NDT) characterizing material thickness, integrity, or other physical properties by means of high-frequency sound waves has become a widely used technique for quality control. In thickness gauging, ultrasonic techniques permit quick and reliable measurement of thickness without requiring access to both sides of a part.

Table of contents


1. Measurement Principles
2. Measurement Modes and Transducer Selection
3. Measurement
4. Factors Affecting Performance and Accuracy
5. Couplants
6. High Temperature Measurements
7. On-line Measurements
8. Cable Length
9. Further Notes on Mode 1: Excitation Pulse To First Back Echo-Mode 1
10. Further Notes on Mode 2: Interface Echo To First Backwall Echo
11. Further Notes on Mode 3: Echo To Echo Following Interface
12. Summary of Applications And Recommended Modes of Measurement - Figure 3
13. Examples of Mode 3 Waveforms
14. Conclusion
15. Appendix I & II And Glossary