Low insertion loss air-coupled ultrasonic transducer with parallel laminated piezoelectric structure

Wang, Xiaoyu; Gong, Xun; Li, Congcong; Wu, Ranran; Chen, Zhenglin; Wu, Haodong; De, Zhang; Cao, Xun

doi:10.1063/5.0022598

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…Especially in air, the increase in measurement flexibility comes with challenges transmitting sufficient acoustic energy into the air and further into the specimen. These issues are extensively elaborated on in a number of publications [ 18 , 23 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Development of an Accurate and Robust Air-Coupled Ultrasonic Time-of-Flight Measurement Technique

Bühling

Küttenbaum

Maack

et al. 2022

Sensors

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Ultrasonic time-of-flight (ToF) measurements enable the non-destructive characterization of material parameters as well as the reconstruction of scatterers inside a specimen. The time-consuming and potentially damaging procedure of applying a liquid couplant between specimen and transducer can be avoided by using air-coupled ultrasound. However, to obtain accurate ToF results, the waveform and travel time of the acoustic signal through the air, which are influenced by the ambient conditions, need to be considered. The placement of microphones as signal receivers is restricted to locations where they do not affect the sound field. This study presents a novel method for in-air ranging and ToF determination that is non-invasive and robust to changing ambient conditions or waveform variations. The in-air travel time was determined by utilizing the azimuthal directivity of a laser Doppler vibrometer operated in refracto-vibrometry (RV) mode. The time of entry of the acoustic signal was determined using the autocorrelation of the RV signal. The same signal was further used as a reference for determining the ToF through the specimen in transmission mode via cross-correlation. The derived signal processing procedure was verified in experiments on a polyamide specimen. Here, a ranging accuracy of <0.1 mm and a transmission ToF accuracy of 0.3μs were achieved. Thus, the proposed method enables fast and accurate non-invasive ToF measurements that do not require knowledge about transducer characteristics or ambient conditions.

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Section: Introductionmentioning

confidence: 99%

Development of an Accurate and Robust Air-Coupled Ultrasonic Time-of-Flight Measurement Technique

Bühling

Küttenbaum

Maack

et al. 2022

Sensors

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show abstract

“…The main limitation of air-coupled ultrasonic transducers is the enormous acoustic impedance mismatch between the piezoelectric material and air. Researchers are also coming up with new ways to overcome the problem [ 14 , 15 ]. Each detection technology has its unique advantages and limitations.…”

Section: Introductionmentioning

confidence: 99%

Noncontact Damage Topography Reconstruction by Wavenumber Domain Analysis Based on Air-Coupled Ultrasound and Full-Field Laser Vibrometer

Hui

Liang

Rui

et al. 2021

Sensors

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Noncontact ultrasonic detection technology is an effective method to detect damage in time. This paper proposes a noncontact damage detection system based on air-coupled ultrasound and full-field laser vibrometer, which realizes the excitation of relatively single-mode guided waves and the wavefield automatic detection. The system performance is verified through experiments, and the experimental wavenumber is consistent with the theoretical dispersion characteristics of the Lamb wave in the A0 mode. Based on this system, the topography reconstruction algorithms, including the Wavenumber Filtering Algorithm and Spatial Wavenumber Algorithm, were tested and compared with the aluminum alloy plate and the carbon fiber reinforced polymer plate. The results show that, based on the air-coupled ultrasound and full-field laser vibrometer detection system, the Spatial Wavenumber Algorithm has better imaging error and contrast, and the damage edge detection is smoother.

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Using sonic crystals to separate the acoustic from the flow field of a fluidic transducer

2022

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Low insertion loss air-coupled ultrasonic transducer with parallel laminated piezoelectric structure

Cited by 7 publications

References 31 publications

Development of an Accurate and Robust Air-Coupled Ultrasonic Time-of-Flight Measurement Technique

Development of an Accurate and Robust Air-Coupled Ultrasonic Time-of-Flight Measurement Technique

Noncontact Damage Topography Reconstruction by Wavenumber Domain Analysis Based on Air-Coupled Ultrasound and Full-Field Laser Vibrometer

Using sonic crystals to separate the acoustic from the flow field of a fluidic transducer

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