Linear and nonlinear ultrasonic characterization of in limestone

Megan McGovern; Henrique Reis

doi:10.1117/12.2082568

23 March 2015 Linear and nonlinear ultrasonic characterization of in limestone

Megan McGovern, Henrique Reis

Proceedings Volume 9438, Health Monitoring of Structural and Biological Systems 2015; 94381A (2015) https://doi.org/10.1117/12.2082568
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

Abstract

Characterization of dolomitic limestone rock samples with increasing levels of damage is presented using linear and nonlinear ultrasonic approaches. Limestone test samples with increasing levels of damage were created artificially by exposing virgin samples to increasing temperature levels of 100, 200, 300, 400, 500, 600, and 700oC for a ninety minute period of time. The linear characterization is based upon the concept of complex moduli, which is estimated using ultrasonic dilatational and shear phase velocity measurements and corresponding attenuations. The nonlinear approach is based upon non-collinear wave mixing, involving mixing of two dilatational waves. Criteria were used to assure that the detected scattered wave originated via wave interaction in the limestone and not from nonlinearities in the testing equipment. These criteria included frequency and propagating direction of the resultant scattered wave, and the time-of-flight separation between the two primary waves and the resulting scattered wave. It was observed that both the linear and nonlinear approaches are able to characterize the level of damage in limestone rock.

Citation Download Citation

Megan McGovern and Henrique Reis "Linear and nonlinear ultrasonic characterization of in limestone", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94381A (23 March 2015); https://doi.org/10.1117/12.2082568

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KEYWORDS

Signal attenuation

Transducers

Ultrasonics

Nonlinear optics

Two wave mixing

Wave propagation

Crystals

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