A5018547414- Ultrasonics and Acoustic Wave Propagation
- Thermography and Photoacoustic Techniques
- Welding Techniques and Residual Stresses
- Additive Manufacturing Materials and Processes
- Non-Destructive Testing Techniques
- Engineering Applied Research
- Ultrasound Imaging and Elastography
- Acoustic Wave Resonator Technologies
- Underwater Acoustics Research
- Industrial Vision Systems and Defect Detection
- Advanced Surface Polishing Techniques
- Structural Health Monitoring Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Acoustic Wave Phenomena Research
- Photocathodes and Microchannel Plates
- Flow Measurement and Analysis
- Laser and Thermal Forming Techniques
- Particle Detector Development and Performance
- Laser Material Processing Techniques
- Nuclear Physics and Applications
- Additive Manufacturing and 3D Printing Technologies
- Antenna Design and Optimization
University of Strathclyde
2021-2024
Indian Institute of Technology Madras
2019-2022
Swinburne University of Technology
2019-2022
EMI (United Kingdom)
1962
Abstract Ultrasonic imaging, using ultrasonic phased arrays, has an enormous impact in science, medicine and society is a widely used modality many application fields. The maximum amount of information which can be captured by array provided the data acquisition method capturing complete set signals from all possible combinations generation detection elements dense array. However, this requires long time, large number transmit channels produces volume data. All these reasons make such...
In-process inspection of the additive manufacturing process requires a technique that can provide reliable measurements given extreme operating environments, small size defects and cyclic melting heating material, caused by subsequently deposited layers. A remote couplant-free ultrasonic using bulk waves image near-surface could address these in-process requirements. Laser induced phased arrays (LIPA) generate detect ultrasound based on laser ultrasonics principles, while array is...
Additive manufacturing (AM) has been revolutionizing the industry due to its ability significantly reduce waste and produce components with intricate shapes. Laser Ultrasonics (LU) is a non-contact couplant free method generate detect ultrasound. LU can accommodate complex component shapes; thus, it potential provide reliable in-process inspection for AM components. In recent years development of Induced Phased Arrays (LIPAs) helped overcome inherently low signal amplitudes at...
Laser Induced Phased Array (LIPA) is a non-contact, couplant-free inspection technique providing high quality ultrasonic imaging. LIPAs use lasers for ultrasound generation and detection: beam forming performed in post processing, using delay-and-sum algorithms, while the data acquisition done by scanning two lasers, offering unique flexibility array designs that are currently impossible to achieve with conventional transducer based phased arrays. When synthesizing 2D LIPA, 3D imaging can be...
Recent developments in metal additive manufacturing (AM) has created a lot of interest sectors including automotive, aerospace and biomedical engineering. It is imperative that the components manufactured additively be inspected for flaws, mechanical properties dimensional accuracy. Several non-destructive testing (NDT) techniques such as X-ray computed tomography conventional ultrasonic have been implemented to evaluate quality these components. Recently, research focused on can perform...
Abstract This study introduces a novel data acquisition method, the Selective Matrix Capture (SMC), that can adapt array geometry during acquisition, to demands of inspected structure, such as defects encountered. The adaptive method is enabled by use Laser Induced Phased Arrays (LIPAs). We have previously demonstrated high-resolution ultrasonic images interior components using Full (FMC) and Total Focusing Method (TFM). However, capturing FMC requires long synthesis time due signal...
Abstract Three-dimensional (3D) ultrasonic imaging enables the viewing of internal features in a more accurate way than cross-sectional imaging. 3D requires two-dimensional (2D) phased arrays to resolve all three spatial dimensions through beamforming along azimuthal and elevation angles. 2D pose manufacturing control challenge due requirement large number elements satisfy Nyquist sampling limit. This problem can be alleviated use sparse array designs. The optimization process is critical,...
Laser Induced Phased Arrays use lasers for generation and detection of ultrasound, enabling remote, non-contact, couplant-free inspection on complex objects. In previous work LIPAs have been utilized to detect locate omni-directional specular reflectors within metallic samples by capturing the full matrix performing total focusing method. This study explores defect characterization through scattering matrices. Scattering matrices, acquired measuring amplitude a as function insonification...
Laser Induced Phased Arrays (LIPAs) use lasers to generate and detect ultrasound, synthesizing the array in post processing. Data acquisition is done remotely, without couplant, addressing NDE challenges of inspection on complex structures under extreme environments. Previously high-resolution ultrasonic imaging components using LIPAs have been demonstrated by capturing Full Matrix employing Total Focusing Method (TFM) as algorithm. However, Capture data method requires long time due...
Abstract Manufacturing processes, such as welding and additive manufacturing, take place at high temperatures extreme environments that offer significant challenges to conventional non-destructive testing methods. Laser Induced Phased Arrays (LIPAs) have evolved a promising method for the aforesaid applications due its remote couplant free operation. Contrary transducer-based phased arrays, LIPAs are synthesized in post-processing by scanning generation detection lasers. The data from...
In-process inspection of the additive manufacturing process requires a technique that can provide reliable measurements given extreme operating environments, small size defects and cyclic melting heating material, caused by subsequently deposited layers. A remote couplant-free ultrasonic using bulk waves image near-surface could address these in-process requirements. Laser induced phased arrays (LIPA) generate detect ultrasound based on laser ultrasonics principles, while array is...
Laser Induced Phased Arrays (LIPAs) are based on the principles of laser ultrasonics where ultrasound is generated and detected by lasers. The beams scanned inspected component, collecting data from various array element positions. In this way, an synthesized in post processing applying a variety ultrasonic imaging algorithms. Unlike transducer phased arrays, which have fixed geometry instrumentation, number elements pitch as well operational frequency, LIPAs present flexibility design...
Abstract Ultrasonic imaging using ultrasonic phased arrays has an enormous impact in science, medicine and society is a widely used modality many application fields. The maximum amount of information which can be captured by array provided the data acquisition method capturing complete set signals from all possible combinations generation detection elements dense array. However, this requires long time, large number transmit channels produces volume data. All these reasons make such...
Abstract Laser induced phased arrays (LIPAs) offer fast and efficient remote ultrasonic imaging for processes operating in extreme environments restricted access such as additive manufacturing welding. In this work, LIPAs are synthesized the non-destructive thermoelastic regime using an 8 ns pulsed 1064 nm generation laser a 532 continuous wave detection laser. The acquired Full Matrix data is post-processed Total Focusing Method (TFM) to image near-surface side-drilled holes inside...