Abstract
The analysis of acoustic wave fields is important for a large number of engineering designs, communication and health-related reasons. The visualization of wavefronts gives valuable information about the type of transducers and excitation signals more suitable for the test itself. This article is dedicated to the development of a fast procedure for acoustic fields visualization in underwater conditions, by means of laser Doppler vibrometer measurements. The ultrasonic probe is a focused transducer excited by a chirp signal. The scope of this work is to evaluate experimentally the properties of the sound beam in order to get reliable information about the transducer itself to be used in many kinds of engineering tests and transducer design.
Highlights
Visualization of acoustic wavefronts started to be the object of intensive research in the 1960s
The visualization of acoustic wavefronts represents a reliable test for transducer design or periodic control, i.e., to check if the properties of the generated sound beam still persist over a long-term period
The most promising approach to develop new transducers capable of non-invasive visualizing acoustic wavefronts has been to consider optical metrology techniques. Specific examples of these methods can be identified as schlieren [2], Michelson interferometry [3], electronic speckle pattern interferometry (ESPI) [4] and laser Doppler anemometry (LDA) [5]
Summary
Visualization of acoustic wavefronts started to be the object of intensive research in the 1960s. The most promising approach to develop new transducers capable of non-invasive visualizing acoustic wavefronts has been to consider optical metrology techniques Specific examples of these methods can be identified as schlieren [2], Michelson interferometry [3], electronic speckle pattern interferometry (ESPI) [4] and laser Doppler anemometry (LDA) [5]. LDV measurements in water pose more problems compared to the ones in air This is mainly due to the poor SNR of the acquired signals, which could impair the quality of the derived two-dimensional (2-D) images representing the ultrasonic wavefronts. The main objective is to quickly obtain high-quality images of the acoustic wavefronts, allowing us to experimentally determine the sound beam properties of a focused transducer To reach this goal, a high-speed experimental setup with dedicated signal processing techniques to filter undesired multiple reflections has been developed. By scanning across an area, a 2D measurement of the acoustic field can be obtained [14,22]
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