A Calibration Technique for Ultrasonic Immersion Transducers and Challenges in Moving Towards Immersion Based Harmonic Imaging
The present article describes the calibration of ultrasonic immersion transducers using reciprocity technique. A step-by-step procedure and instrumentation requirements for transducer calibration are presented. Challenges encountered during the calibration experiment such as diffraction and attenuation corrections, and mismatched electrical impedances were also explored. The calibrated transducer was used to measure the acoustic nonlinearity parameter (β) of distilled water using the finite amplitude method. The objective of the current study is to identify potential challenges while moving towards a nonlinear immersion scanning technique for immersed engineering solids. Challenges such as effect of additives (corrosion inhibitors, surfactants etc.), misalignment of transducers, and effect of longer propagation paths were explored. Additives to distilled water were found to decrease the β of the mixture, and for an axial transducer misalignment of 2 mm, β was observed to increase by a factor of 2. Finally, the effect of propagation distance and excitation amplitude is shown.
KeywordsUltrasonics Transducer calibration Nonlinearity parameter
This work was supported by the Industry/University cooperative Research Program of the Center for Nondestructive Evaluation at Iowa State University. The authors would also like to thank Dr. Jenifer Saldanha for proofreading the manuscript.
- 1.Carstensen, Bacon, D.R.: In: Hamilton, M.F., Blackstock, D.T. (eds.) Nonlinear Acoustics, chap. 15, pp. 421–448. Academic Press, San Diego (1998)Google Scholar
- 3.Hurley, D.C., Yost, W.T.: ES Boltz and CM Fortunko (1997) A Comparison of Three Techniques to Determine the Nonlinear Ultrasonic Parameter β. Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston (1997)Google Scholar
- 5.Cantrell, J.H.: Nondestructive Evaluation of Metal Fatigue Using Nonlinear Acoustics. Review of Progress in Quantitative Nondestructive Evaluation (2009)Google Scholar
- 11.Kazakov, V.V., Johnson, P.A.: Nonlinear wave modulation imaging. Nonlinear Acoust. Begin. 21st Century 2, 763–766 (2002)Google Scholar
- 18.Dace, G.E., Thompson, R.B., Brasche, L.J.H., Rehbein, D.K., Buck, O.: Nonlinear Acoustics, a Technique to Determine Microstructural Changes in Materials. Review of Progress in Quantitative Nondestructive Evaluation (1991)Google Scholar
- 19.Dace, G.E., Thompson, R.B., Buck, O.: Measurement of the Acoustic Harmonic Generation for Materials Characterization Using Contact Transducers. Review of Progress in Quantitative Nondestructive Evaluation, vol. 11B (1992)Google Scholar
- 22.Barnard, D.J., Chakrapani, S.K.: Measurement of nonlinearity parameter (β) of water using commercial immersion transducers. In: AIP Conference Proceedings (2016)Google Scholar
- 31.Breazeale, M.A., Philip, J.: Determination of third-order elastic constants from ultrasonic harmonic generation measurement. In: Mason, W.P., Thurston, R.N. (eds.) Physical Acoustics, vol. XVII, pp. 1–60. Academic Press, New York (1984)Google Scholar
- 32.Barnard, D.J., McKenna, M.J., Foley, J.C.: Absolute displacement calibration techniques for commercial superheterodyne receivers. In: AIP Conference Proceedings (2001)Google Scholar
- 33.Na, J.K., Yost, W.T., Cantrell, J.H., Kessel, G.L.: Effects of surface roughness and nonparallelism on the measurement of the acoustic nonlinearity parameter in steam turbine blades. In: AIP Conference Proceedings (2000)Google Scholar
- 36.Blackstock, D.T., Hamilton, M.F., Pierce, A.D.: In: Hamilton, M.F., Blackstock, D.T. (eds.) Nonlinear Acoustics, chap. 4, pp. 65–150. Academic Press, San Diego (1998)Google Scholar