NDTnet - September 1996, Vol.1 No.09

Ultrasonic Probes for Special Tasks - the Optimum Probe for Each Application

Author G. Splitt

Transducer Workshop

Abstract

Probes with composite transducers are a milestone for ultrasonic testing. As demonstrated by the examples, we can take profit from the piezocomposite features of high acoustic efficiency, low crosstalk, low mechanical Q, low acoustic impedance and mechanical flexibility to improve the overall probe performance. Especially, we gain high sensitivity in combination with well damped signals.


1. Introduction

2. Desirable Characteristics of Ultrasonic Transducers

3. Historical Design Perspective

4. Probes for Spot Weld Testing

5. Testing of Pipelines

6. High Temperature Measurement

7. Magnetic Probes

8. New Angle Beam Probes

PROBE TYPE SWB WB
Element size [mm²] 14 x 14 20 x 22
Frequency [MHz] 2 or 5 2 or 4
Contact face [mm²] 21 x 36 29 x 53
exit point [mm] 12 - 18 (depend. on angle) 27
Bandwidth [%] 50 40

9. Piezocomposite Material

10. Conclusions

7. Literature

  1. R.E. Newnham et al., Composite piezoelectric transducers, Mater. Eng., vol. 2, p. 93 - 106 (1980)
  2. Ultraschall-Prüfköpfe für 650 °C Dauertemperatur, H. Mrasek, D. Gohlke, K. Matthies, E. Neumann, BAM, Berlin , NDT annual Conference 1996, 13. - 15. May in Lindau. Conference Report

Author`s Profile


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© Copyright 1. Sept 1996 Rolf Diederichs, info@ndt.net
/DB:Article /AU:Splitt_G /IN:Krautkramer /CN:DE /CT:UT /CT:transducer /ED:1996-09