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A laser ultrasound emitter based on high-power diode laser in overdrive operation mode for biomedical imaging applications.
Ultrasonics
December 2024
Universidad Carlos III de Madrid, Avenida de la Universidad, 30, Leganes, Madrid, Spain.
The most common transducers used to generate ultrasound in medical applications are based on short electrical pulses applied to piezoelectric transducers and capacitive micromachined ultrasound transducers. However, piezoelectric transducers have a limited frequency bandwidth, defined by their physical thickness, and capacitive micromachined ultrasound transducers have poor transmission efficiency. The high frequency cutoff limits the spatial resolution of ultrasonic images.
View Article and Find Full Text PDFOptoacoustic lenses for lateral sub-optical resolution elasticity imaging.
Photoacoustics
February 2025
Optics and Photonics Group, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, Nottinghamshire, United Kingdom.
In this paper, we demonstrate for the first time the focusing of gigahertz coherent phonon pulses propagating in water using picosecond ultrasonics and Brillouin light scattering. We achieve this by using planar Fresnel zone plate and concave lenses with different focal lengths. Pump light illuminating the optoacoustic lens generates a focusing acoustic field, and Brillouin scattered probe light allows the acoustic field to be continuously monitored over time.
View Article and Find Full Text PDFVelocimetry of GHz elastic surface waves in quartz and fused silica based on full-field imaging of pump-probe reflectometry.
Photoacoustics
August 2024
Munich University of Applied Sciences HM, Lothstr. 34, Munich, 80335, Bavaria, Germany.
This study reports an imaging method for gigahertz surface acoustic waves in transparent layers using infrared subpicosecond laser pulses in the ablation regime and an optical pump-probe technique. The reflectivity modulations due to the photoelastic effect of generated multimodal surface acoustic waves were imaged by an sCMOS camera illuminated by the time-delayed, frequency-doubled probe pulses. Moving the delay time between , image stacks of wave field propagation were created.
View Article and Find Full Text PDFA novel 3D evaluation method for surface defects using broadband laser-generated Rayleigh waves with wavenumber analysis.
Ultrasonics
March 2024
State Key Laboratory of Fluid Power Components and Mechatronic Systems, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Windey Co., Ltd., Hangzhou 310012, China.
To address the issues of large imaging errors for small defects and the difficulty in depth evaluation using local wavenumber estimation for surface defect imaging, a novel three-dimensional (3D) evaluation method for surface defects using broadband laser-generated Rayleigh waves with wavenumber analysis is proposed. A finite element model is established to investigate the interaction between the Rayleigh wave and the surface defect and reveal the wavenumber change mechanism of the non-dispersive Rayleigh wave in the case of defects. It is discovered that when the Rayleigh wave encounters the surface defect, various mode-converted scattered waves are generated, resulting in the appearance of new components with wavenumbers lower than that of the incident Rayleigh wave in the wavenumber domain.
View Article and Find Full Text PDFQuantitative detection of surface defect using laser-generated Rayleigh wave with broadband local wavenumber estimation.
Ultrasonics
July 2023
State Key Laboratory of Fluid Power Components and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China.
Laser ultrasonic technology has been widely used in surface defect detection attribute to its non-contact, non-destructive and high spatial resolution characteristics. This paper proposes a surface defect quantitative detection method using laser-generated Rayleigh wave with broadband local wavenumber estimation. In this method, considering the broadband characteristics of laser-generated Rayleigh wave, the broadband local wavenumber estimation is presented to achieve the defect imaging accurately, and then the defect geometric parameters are estimated based on image segmentation.
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