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Anthony Gachagan - IEEE Xplore Author Profile
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Anthony Gachagan

Also published under: A. Gachagan

Publications
78
Citations
544
Publications by Year
19932023
Co-Authors:
Show All Co-Authors (92)
Image of author Anthony Gachagan

Anthony Gachagan

Also published under: A. Gachagan

Affiliation

University of Strathclyde
Glasgow
Scotland, UK

Publication Topics

Biography

Anthony Gachagan received the B.Sc. degree in electronic and microprocessor engineering and Ph.D. degree in entitled ``An evaluation of 1-3 connectivity composite transducers for air-coupled ultrasonic applications'' from the University of Strathclyde.,He is the Director of the Centre for Ultrasonic Engineering and Associate Dean Postgraduate Research, University of Strathclyde, Glasgow, UK, and Co-Director of the EPSRC CDT in FUSE, jointly held with University of Glasgow. He has worked in the field of ultrasonic engineering for more than 30 years across a broad application range including NDE, sonar, bioacoustics, health, manufacturing, and industrial process control. He has published more than 140 papers, and his primary research interest...
Publications
78
Citations
544
Publications by Year
19932023
Co-Authors:
Show All Co-Authors (92)
Author's Published Works

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Comparing Generation III Relaxor-PT Single Crystal with Modified PZT-4 for Power Ultrasonics Devices

Abdul Hadi Chibli;Margaret Lucas;Anthony Gachagan;Sandy Cochran

2023 IEEE International Symposium on Applications of Ferroelectrics (ISAF)
Year: 2023 | Conference Paper |
Lead-based piezocrystals have been thoroughly investigated by various research teams for power ultrasonic transducers. The key objective of this work is to evaluate whether Gen. III single crystal could provide similar performance to the Navy type I (similar properties to PZT-4) and help in miniaturising the overall length of power ultrasonic instruments. This study started by incorporating four d...Show More

Comparing Generation III Relaxor-PT Single Crystal with Modified PZT-4 for Power Ultrasonics Devices

Abdul Hadi Chibli;Margaret Lucas;Anthony Gachagan;Sandy Cochran

Year: 2023 | Conference Paper |

Grating Lobe Suppression Through Novel, Sparse Laser Induced Phased Array Design

Peter Lukacs;Geo Davis;Don Pieris;Anthony Gachagan;Theodosia Stratoudaki

2022 IEEE International Ultrasonics Symposium (IUS)
Year: 2022 | Conference Paper |
Cited by: Papers (3)
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: ultrasonic beam forming is performed in post processing, using delay-and-sum algorithms, while the data acquisition is done by scanning the two lasers, offering a unique flexibility in array designs that are curr...Show More

Grating Lobe Suppression Through Novel, Sparse Laser Induced Phased Array Design

Peter Lukacs;Geo Davis;Don Pieris;Anthony Gachagan;Theodosia Stratoudaki

Year: 2022 | Conference Paper |

Incorporating stainless steel and titanium back masses in twice planar folded ultrasonic scalpels for robotic surgery

Abdul Hadi Chibli;Margaret Lucas;Anthony Gachagan;Sandy Cochran

2022 IEEE International Ultrasonics Symposium (IUS)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
Ultrasonically actuated robotic scalpels have been increasingly adopted in surgery as they offer reduced bleeding and heat injuries. However, due to their long sonotrodes and high shaft operating temperatures, which could result in shearing effects, current designs are challenging to operate and manoeuvre intracorporeally. Assisted surgical platforms, such as the Da Vinci®system (Intuitive Surgica...Show More

Incorporating stainless steel and titanium back masses in twice planar folded ultrasonic scalpels for robotic surgery

Abdul Hadi Chibli;Margaret Lucas;Anthony Gachagan;Sandy Cochran

Year: 2022 | Conference Paper |

Incorporating Planar Folded Front Masses in Bolted Langevin-Style Transducers for Minimally Invasive Surgery

Abdul Hadi Chibli;Xuan Li;Nicola Giuseppe Fenu;Sandy Cochran;Anthony Gachagan

2021 IEEE International Ultrasonics Symposium (IUS)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
The Harmonic ACE® (J&J Medical Devices, OH, USA) based on the conventional Bolted-Langevin Transducer (BLT) configuration of piezoelectric transducers is used in robotic surgery due to its fast cutting of soft tissues and improved cut quality. However, the manoeuvrability of the Harmonic Aceh® which is the only ultrasonic scalpel compatible with the Da Vinci Surgical System® (Intuitive Surgical In...Show More

Incorporating Planar Folded Front Masses in Bolted Langevin-Style Transducers for Minimally Invasive Surgery

Abdul Hadi Chibli;Xuan Li;Nicola Giuseppe Fenu;Sandy Cochran;Anthony Gachagan

Year: 2021 | Conference Paper |

Remote Ultrasonic Imaging of a Wire Arc Additive Manufactured Ti-6AI-4V Component using Laser Induced Phased Array

Peter Lukacs;Geo Davis;Theodosia Stratoudaki;Stewart Williams;Charles N. MacLeod;Anthony Gachagan

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
Year: 2021 | Conference Paper |
Cited by: Papers (7)
Additive manufacturing (AM) has been revolutionizing the manufacturing industry due to its ability to significantly reduce waste and produce components with intricate shapes. Laser Ultrasonics (LU) is a non-contact and couplant free method to generate and detect ultrasound. LU can accommodate complex component shapes; thus, it has the potential to provide a reliable in-process inspection method fo...Show More

Remote Ultrasonic Imaging of a Wire Arc Additive Manufactured Ti-6AI-4V Component using Laser Induced Phased Array

Peter Lukacs;Geo Davis;Theodosia Stratoudaki;Stewart Williams;Charles N. MacLeod;Anthony Gachagan

Year: 2021 | Conference Paper |

A Phased Array Ultrasound Roller Probe for Automated in-Process/Interpass Inspection of Multipass Welds

Randika K. W. Vithanage;Ehsan Mohseni;Zhen Qiu;Charles MacLeod;Yashar Javadi;Nina Sweeney;Gareth Pierce;Anthony Gachagan

IEEE Transactions on Industrial Electronics
Year: 2021 | Volume: 68, Issue: 12 | Journal Article |
Cited by: Papers (21)
Non-destructive inspection of multi-pass welds for defects is traditionally performed once all layers have been deposited and the sample is at ambient temperature and therefore can lead to complicated and expensive rework, reduced throughput, and higher lead times. By performing inspection either as the weld is deposited, or between weld passes, it is possible to identify defects earlier in the pr...Show More

A Phased Array Ultrasound Roller Probe for Automated in-Process/Interpass Inspection of Multipass Welds

Randika K. W. Vithanage;Ehsan Mohseni;Zhen Qiu;Charles MacLeod;Yashar Javadi;Nina Sweeney;Gareth Pierce;Anthony Gachagan

Year: 2021 | Volume: 68, Issue: 12 | Journal Article |

Enhanced Modelling of a 1-D Phased Ultrasonic Array for Intracorporeal Sonoporation

Alexandru C. Moldovan;Zhen Qiu;David Lines;Anthony Gachagan;Sandy Cochran

2020 IEEE International Ultrasonics Symposium (IUS)
Year: 2020 | Conference Paper |
Precise control of ultrasonic (US) power is required during sonoporation to ensure pressure amplitude in the target tissue is maintained within the bounds of therapeutic efficiency and below the maximum threshold of safe use. Pressure mapping with a scanning tank and needle hydrophone (NH) represents a convenient means to evaluate US beam profiles and peak negative pressures (PNP) achieved by ther...Show More

Enhanced Modelling of a 1-D Phased Ultrasonic Array for Intracorporeal Sonoporation

Alexandru C. Moldovan;Zhen Qiu;David Lines;Anthony Gachagan;Sandy Cochran

Year: 2020 | Conference Paper |

Determination of Bubble Size Distribution Using Ultrasound Array Imaging

Marcus Ingram;Carmelo Mineo;Anthony Gachagan;Anthony J. Mulholland;Alison Nordon;Martin Hegarty

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Year: 2020 | Volume: 67, Issue: 7 | Journal Article |
Cited by: Papers (7)
In this article, ultrasonic phased arrays are deployed as an imaging tool for industrial process analysis. Such arrays are typically used for sonar, medical diagnosis, and nondestructive testing; however, they have not yet been applied to industrial process analysis. The precise positioning of array elements and high frequencies possible with this technology mean that highly focused images can be ...Show More

Determination of Bubble Size Distribution Using Ultrasound Array Imaging

Marcus Ingram;Carmelo Mineo;Anthony Gachagan;Anthony J. Mulholland;Alison Nordon;Martin Hegarty

Year: 2020 | Volume: 67, Issue: 7 | Journal Article |

Determining Position and Orientation of a 3-Wheel Robot on a Pipe Using an Accelerometer

Alexander McGregor;Gordon Dobie;Neil R. Pearson;Charles N. MacLeod;Anthony Gachagan

IEEE Sensors Journal
Year: 2020 | Volume: 20, Issue: 9 | Journal Article |
Cited by: Papers (12)
Accurate positioning of robots on pipes is a challenge in automated industrial inspection. It is typically achieved using expensive and cumbersome external measurement equipment. This paper presents an Inverse Model method for determining the orientation angle (α) and circumferential position angle (w) of a 3 point of contact robot on a pipe where measurements are taken from a 3-axis accelerometer...Show More

Determining Position and Orientation of a 3-Wheel Robot on a Pipe Using an Accelerometer

Alexander McGregor;Gordon Dobie;Neil R. Pearson;Charles N. MacLeod;Anthony Gachagan

Year: 2020 | Volume: 20, Issue: 9 | Journal Article |

Using Coded Excitation to maintain Signal to Noise for FMC+TFM on Attenuating Materials

David Lines;Ehsan Mohseni;Yashar Javadi;Carmelo Mineo;Randika Vithanage;Zhen Qiu;Charles MacLeod;Gareth Pierce;Anthony Gachagan

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
Cited by: Papers (5)
Ultrasonic Non-Destructive Evaluation using Full Matrix Capture (FMC) and Total Focusing Method (TFM) is used for high resolution imaging as every pixel is in optimal focus. FMC excites one element in turn, so operates with lower transmitted energy compared to phased array beamforming. The energy at a reflector is further reduced by the broad directivity pattern of the single element. The large nu...Show More

Using Coded Excitation to maintain Signal to Noise for FMC+TFM on Attenuating Materials

David Lines;Ehsan Mohseni;Yashar Javadi;Carmelo Mineo;Randika Vithanage;Zhen Qiu;Charles MacLeod;Gareth Pierce;Anthony Gachagan

Year: 2019 | Conference Paper |

Towards Guided Wave Robotic NDT Inspection: EMAT Size Matters

Oksana Trushkevych;Steven Dixon;Morteza Tabatabaeipour;Gordon Dobie;Mark D. G. Potter;Charles MacLeod;Anthony Gachagan;S. Gareth Pierce;Rachel S. Edwards

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
Cited by: Papers (4)
The first steps towards fast robotic screening of wall thinning in the industrially relevant example of 10mm thick steel plates are reported. Electromagnetic acoustic transducers (EMATs) are used to generate and detect guided shear horizontal wavemodes, as these show promise for this type of inspection. EMATs are miniaturised to reduce magnetic drag on ferritic steels, and are designed to produce ...Show More

Towards Guided Wave Robotic NDT Inspection: EMAT Size Matters

Oksana Trushkevych;Steven Dixon;Morteza Tabatabaeipour;Gordon Dobie;Mark D. G. Potter;Charles MacLeod;Anthony Gachagan;S. Gareth Pierce;Rachel S. Edwards

Year: 2019 | Conference Paper |

Development of a 1-D Linear Phased Ultrasonic Array for Intravascular Sonoporation

Alexandru C. Moldovan;Zhen Qiu;David Lines;Anthony Gachagan;Sandy Cochran

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
Therapeutic efficiency of sonoporation is hampered by ultrasound attenuation, low focusing efficiency due to beam scattering from the variety of tissues in the propagation path, and heating. This paper describes the manufacturing and characterization of miniature 1-3 connectivity 1-D linear phased arrays of the size of an 8 Fr catheter for intracorporeal sonoporation. Their advantage over external...Show More

Development of a 1-D Linear Phased Ultrasonic Array for Intravascular Sonoporation

Alexandru C. Moldovan;Zhen Qiu;David Lines;Anthony Gachagan;Sandy Cochran

Year: 2019 | Conference Paper |

Investigation into the effectiveness of different highpower ultrasonic transducers on cavitation yield and field control for consumer devices

Laura Morrison;Richard L O’Leary;Walter Galbraith;Zhen Qiu;Anthony Gachagan

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
Interest into consumer applications of high power ultrasound is growing and investigation into the development of transducers for this application is necessary. This paper conducts a primary evaluation on alternative small-scale transducer designs for potential application as cavitation generators in portable ultrasonic devices for cleaning applications. Simulation of the pressure field produced b...Show More

Investigation into the effectiveness of different highpower ultrasonic transducers on cavitation yield and field control for consumer devices

Laura Morrison;Richard L O’Leary;Walter Galbraith;Zhen Qiu;Anthony Gachagan

Year: 2019 | Conference Paper |

A Feasibility Study on Guided Wave- Based Robotic Mapping

Morteza Tabatabaeipour;Oksana Trushkevych;Gordon Dobie;Rachel S. Edwards;Steven Dixon;Charles MacLeod;Anthony Gachagan;S. Gareth Pierce

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
Cited by: Papers (6)
Ultrasonic guided wave imaging techniques have received much attention in recent years for fast screening of large structures. Here we explore the feasibility of Occupancy Grid Mapping (OGM) in order to construct a map of an unknown component for inspection. OGM is a well-established algorithm in robotics, but for the first time we are applying it to Shear Horizontal (SH) guided wave imaging. This...Show More

A Feasibility Study on Guided Wave- Based Robotic Mapping

Morteza Tabatabaeipour;Oksana Trushkevych;Gordon Dobie;Rachel S. Edwards;Steven Dixon;Charles MacLeod;Anthony Gachagan;S. Gareth Pierce

Year: 2019 | Conference Paper |

Characterization and Evaluation of Sparse Array Transducers for Small Particle Detection

Xiaotong Li;Anthony Gachagan;Paul Murray

2019 IEEE International Ultrasonics Symposium (IUS)
Year: 2019 | Conference Paper |
In this paper, we present a log spiral array transducer which has been designed as a flexible alternative to conventional ultrasonic sensor technology. Two prototype transducers with our proposed array pattern have been fabricated, one using a fiber Composite Element Composite Array Transducer (CECAT) structure, the other using a conventional 1-3 composite (C1-3). Three measurements including the ...Show More

Characterization and Evaluation of Sparse Array Transducers for Small Particle Detection

Xiaotong Li;Anthony Gachagan;Paul Murray

Year: 2019 | Conference Paper |

Virtual Prototyping of a Catheter Transducer Array for Internal Hepatic Sonoporation

Alexandru Corneliu Moldovan;Jerzy Dziewierz;Anthony Gachagan;Sandy Cochran;Holly Lay

2018 IEEE International Ultrasonics Symposium (IUS)
Year: 2018 | Conference Paper |
Sonoporation for targeted cancer chemotherapy in the liver with an external ultrasonic source is hampered by the ribs and fat surrounding the organ. Current therapies rely on array beam forming with sequential triggering of elements to spare the ribs. However, the peak negative pressures (PNPs) achieved in hepatic tumors are rather low and there is risk associated with high power ultrasound incide...Show More

Virtual Prototyping of a Catheter Transducer Array for Internal Hepatic Sonoporation

Alexandru Corneliu Moldovan;Jerzy Dziewierz;Anthony Gachagan;Sandy Cochran;Holly Lay

Year: 2018 | Conference Paper |

Linear Ultrasonic Array Development Incorporating Cantor Set Fractal Geometry

H. Fang;Z. Qiu;R. L. O'Leary;A. Gachagan;A. J. Mulholland

2018 IEEE International Ultrasonics Symposium (IUS)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Naturally occurring resonating systems utilize structures containing a range of length scales to produce a broad operating bandwidth. It has previously been reported that a piezoelectric composite transducer based on a fractal geometry, which thereby introduces components with varying length scales, results in a wider operational bandwidth and a higher sensitivity. In this paper, the work is now e...Show More

Linear Ultrasonic Array Development Incorporating Cantor Set Fractal Geometry

H. Fang;Z. Qiu;R. L. O'Leary;A. Gachagan;A. J. Mulholland

Year: 2018 | Conference Paper |

Ultrasonic Array Imaging Through Reverberating Layers for Industrial Process Analysis

Marcus Ingram;Anthony Gachagan;Anthony J. Mulholland;Alison Nordon;Martin Hegarty

2018 IEEE International Ultrasonics Symposium (IUS)
Year: 2018 | Conference Paper |
Cited by: Papers (3)
In this paper, ultrasonic phased arrays are investigated as an imaging tool for industrial process analysis. Noninvasive process measurement, via transmission of information through a vessel wall, typically requires a window to create an optical path between the sensor and the process. Ultrasonic array imaging provides a means to overcome this barrier as it is specifically used to image into optic...Show More

Ultrasonic Array Imaging Through Reverberating Layers for Industrial Process Analysis

Marcus Ingram;Anthony Gachagan;Anthony J. Mulholland;Alison Nordon;Martin Hegarty

Year: 2018 | Conference Paper |

Broadband Piezocrystal Transducer Array for Non-Destructive Evaluation Imaging Applications

Zhen Qiu;Haoyu Fang;Richard O'Leary;Anthony Gachagan;Alexandru Moldovan

2018 IEEE International Ultrasonics Symposium (IUS)
Year: 2018 | Conference Paper |
A 32-element, 5MHz linear array, incorporating PMN-PT 1-3 piezo-polymer composite, has been designed using finite element (FE) modelling. The Elasto-Electric material properties of the PMN-PT samples were characterized and evaluated within the FE model to ensure accurate corroboration. The array configuration and performance were then investigated, including array microstructure, and steering and ...Show More

Broadband Piezocrystal Transducer Array for Non-Destructive Evaluation Imaging Applications

Zhen Qiu;Haoyu Fang;Richard O'Leary;Anthony Gachagan;Alexandru Moldovan

Year: 2018 | Conference Paper |

Broadband 1–3 Piezoelectric Composite Transducer Design Using Sierpinski Gasket Fractal Geometry

Haoyu Fang;Zhen Qiu;Anthony J. Mulholland;Richard L. O’Leary;Anthony Gachagan

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Year: 2018 | Volume: 65, Issue: 12 | Journal Article |
Cited by: Papers (10)
Wider operational bandwidth is an important requirement of an ultrasound transducer across many applications. In nature, it can be observed that several hearing organs possess a broad operating bandwidth by having a varying length scales structure. Moreover, conventional 1-3 piezoelectric composite transducers have been widely recognized for their wider bandwidth over their piezoelectric ceramic c...Show More

Broadband 1–3 Piezoelectric Composite Transducer Design Using Sierpinski Gasket Fractal Geometry

Haoyu Fang;Zhen Qiu;Anthony J. Mulholland;Richard L. O’Leary;Anthony Gachagan

Year: 2018 | Volume: 65, Issue: 12 | Journal Article |

Calibration of ultrasonic phased arrays for industrial applications

M. Ingram;A. Gachagan;A. J. Mulholland;A. Nordon;J. Dziewierz;M. Hegarty;E. Becker

2017 IEEE SENSORS
Year: 2017 | Conference Paper |
Cited by: Papers (1)
This paper investigates the consistency in phased array element performance by extracting information from the Full Matrix Capture (FMC) of a reflection from a planar interface. The purpose of this work is to generate a robust methodology for tracking phased array performance over time, therefore, ensuring the reliability of measured data. To achieve this, a calibration method has been developed t...Show More

Calibration of ultrasonic phased arrays for industrial applications

M. Ingram;A. Gachagan;A. J. Mulholland;A. Nordon;J. Dziewierz;M. Hegarty;E. Becker

Year: 2017 | Conference Paper |

Linear ultrasonic array incorporating a Cantor Set fractal element configuration

Haoyu Fang;Zhen Qiu;Anthony Mulholland;Richard O'Leary;Anthony Gachagan

2017 IEEE International Ultrasonics Symposium (IUS)
Year: 2017 | Conference Paper |
The resonance frequency of an active element in a piezoelectric ultrasonic transducer is dependent on its length scale. Inspired by natural occurring auditory systems, incorporation of elements with varying length scales in the piezoelectric transducer design can result in a wider operational bandwidth. A mathematical algorithm has been developed to define the feature of a fractal geometry called ...Show More

Linear ultrasonic array incorporating a Cantor Set fractal element configuration

Haoyu Fang;Zhen Qiu;Anthony Mulholland;Richard O'Leary;Anthony Gachagan

Year: 2017 | Conference Paper |

Linear ultrasonic array incorporating a Cantor Set fractal element configuration

H. Fang;Z. Qiu;R. L. O'Leary;A. Gachagan;A. J. Mulholland

2017 IEEE International Ultrasonics Symposium (IUS)
Year: 2017 | Conference Paper |
The resonance frequency of an active element in a piezoelectric ultrasonic transducer is dependent on its length scale. Inspired by natural occurring auditory systems, incorporation of elements with varying length scales in the piezoelectric transducer design can result in a wider operational bandwidth. In this paper, a mathematical algorithm was developed first to define the feature of a fractal ...Show More

Linear ultrasonic array incorporating a Cantor Set fractal element configuration

H. Fang;Z. Qiu;R. L. O'Leary;A. Gachagan;A. J. Mulholland

Year: 2017 | Conference Paper |

Design of a 2D sparse array transducer for integration into an ergonomic transcranial ultrasound system

Xiaotong Li;Anthony Gachagan;Paul Murray

2017 IEEE International Ultrasonics Symposium (IUS)
Year: 2017 | Conference Paper |
Cited by: Papers (3)
Transcranial Doppler Ultrasound (TCD) is a non-invasive approach that has been used in both diagnosis and therapy of stroke. However, current TCD devices are highly operator dependent and a 2D sparse array transducer can help reduce the operator dependency with its improved imaging and focusing capabilities. This paper compares the potential of three aperiodic sparse array configurations: random a...Show More

Design of a 2D sparse array transducer for integration into an ergonomic transcranial ultrasound system

Xiaotong Li;Anthony Gachagan;Paul Murray

Year: 2017 | Conference Paper |

Design of a 2D sparse array transducer for integration into an ergonomic transcranial ultrasound system

Xiaotong Li;Anthony Gachagan;Jerzy Dziewierz;Richard O'Leary;Paul Murray

2017 IEEE International Ultrasonics Symposium (IUS)
Year: 2017 | Conference Paper |
Transcranial Doppler Ultrasound (TCD) is one of the techniques that have been used for stroke diagnosis. This paper compares the potential of three aperiodic sparse array configurations: random array; sunflower spiral array; and log spiral array for application to TCD. To cover the full temporal window, a 30mm diameter circular aperture is selected, with a 2MHz operating frequency to match current...Show More

Design of a 2D sparse array transducer for integration into an ergonomic transcranial ultrasound system

Xiaotong Li;Anthony Gachagan;Jerzy Dziewierz;Richard O'Leary;Paul Murray

Year: 2017 | Conference Paper |

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