AI Article Synopsis
- This research examines how partial reflection affects the accurate measurement of the ultrasonic attenuation coefficient when using contact transducers, highlighting a significant overestimation if this effect is ignored.
- A new measurement procedure is introduced that allows for simultaneous determination of both the reflection coefficient and the attenuation coefficient, while maintaining the coupling conditions in place.
- It is demonstrated that incorporating a reflection correction improves accuracy and reduces random errors, with successful application on a material with a known attenuation coefficient and a cement-based material.
Article Abstract
This research investigates the influence of partial reflection on the measurement of the absolute ultrasonic attenuation coefficient using contact transducers. The partial, frequency-dependent reflection arises from the thin fluid-layer interface formed between the transducer and specimen surface. It is experimentally shown that neglecting this reflection effect leads to a significant overestimation in the measured attenuation coefficient. A systematic measurement procedure is proposed that simultaneously obtains the ultrasonic signals needed to calculate both the reflection coefficient of the interface and the attenuation coefficient, without disturbing the existing coupling conditions. The true attenuation coefficient includes a correction based on the measured reflection coefficient--this is called the reflection correction. It is shown that including the reflection correction also reduces the variation (random error) in the measured attenuation coefficient. The accuracy of the proposed method is demonstrated for a material with a known attenuation coefficient. The proposed method is then used to measure the high attenuation coefficient of a cement-based material.
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| http://dx.doi.org/10.1121/1.3106125 | DOI Listing |
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