Dr Dean Callaghan
Lecturer & Researcher, Department of Aerospace, Mechanical & Electronics Engineering
Dr. Callaghan has a BEng in Mechanical Engineering from Dublin Institute of Technology (2007) and a PhD degree in Photonics for Biomedical force sensing from Dublin Institute of Technology (2013). He was previously a lecturer and with DIT and a researcher with the Photonics Research Centre and the Biomedical Devices and Assistive Technology Research group. He has been a reviewer for IEEE Sensors since 2011. He is currently a lecturer and researcher with the department of Aerospace, Mechanical and Electronics Engineering within the School of Engineering at Institute of Technology Carlow.
He is a member of the IT Carlow Engineering Centre of Research and Enterprise (engCORE) where he has expanded his research interests into photonic sensing for smart structures, the intelligent built environment and electromagnetic coil thermal and stress analysis. Current research work focuses on the amalgamation of Fused Deposition Modelling (FDM) and optical fibre sensing to produce a range of force transducers and smart sensing structures for the biomedical and aerospace industries.
- Research Interests
- Research Supervision
Areas of interest include:
1) The key limitation factors for successful integration of small scale photonic force sensors into medical devices for minimally invasive robotic surgery (MIRS) and magnetic resonance imaging (MRI) interventions.
2) The investigation of optimal sensor design using topology optimisation techniques.
3) The linear and nonlinear numerical modelling of adhesive interfaces between optical fibres and host structures.
4) The characterisation of tissue-instrument interaction forces during MRI and MIRS surgical interventions.
Other application areas of interest for photonic force sensing include, prosthetics, thermal and mechanical stresses in electromagnetic coils, embedded sensing in 3D printed Titanium and stainless steel components, structural monitoring of composite and concrete structures and the characterisation of the thermal properties of phase change materials (PCM).
Current Research Projects
The development of a multi-axial fibre-optic force sensor utilising FDM 3D printing technology. The proposed 3D printed transducer with embedded optical sensors will be optimised for manipulators used under continuous MRI with resulting low magnetic susceptibilities. The MRI compatible transducer will enable the end-user to apply optimal forces to instruments as well as eliminating the subjective nature of some procedures.
The investigation and characterisation of a 3D printed Titanium/Stainless Steel transducer with embedded optical sensors designed to meet the need for small, modular, biocompatible electromagnetically immune force sensors for in-vivo real time force measurement and control.
The modelling and experimental characterisation of the complex thermal and mechanical stresses in concentrated wound electromagnetic motor coils.
Previous Research Projects
The development of prototype surgical scissor blades with integrated fibre Bragg grating (FBG) sensors for measurement of material fracture properties and interaction forces generated at the tissue-blade interface during cutting. This project was funded by the DIT ABBEST Research Scholarship Scheme.
An early exploration proof of concept entitled “Sensorised Intraluminal Staplers for Laparoscopic Surgical Anastomosis” funded by the Science Foundation Ireland (SFI) Technology Innovation Development Award (TIDA) initiative. An invention disclosure form (IDF) was filed as a result of this research work.
Comparing the performance of smart sensorised laparoscopic scissors using FBG and Photonics Crystal Fibres (PCF) force sensors. This project built on previous research by using a tapered PCF sensor with reduced the temperature sensitivity of the sensorised device by a factor of 10. An invention disclosure form (IDF) was filed as a result of this research work.
1. Ginu Rajan, Dean Callaghan, Yuliya Semenova and Gerald Farrell “Optical Fiber Sensors and Interrogation Systems for Interaction Force Measurements in Minimally Invasive Surgical Devices” Smart Sensors for Industrial Applications, CRC Press, May 2013, ISBN: 9781466568105. http://www.crcpress.com/product/isbn/9781466568105
2. Dean J. Callaghan, Mark M. McGrath, Ginu Rajan, Eugene Coyle, Yuliya Semenova and Gerald Farrell “Analysis of Strain Transfer to FBG’s for Sensorized Telerobotic End-Effector Applications” Advances in Robotic Research. Theory, Implementation, Application. Springer Verlag, Part 3, Pages 65-75, June 2009. ISBN: 978-3-642-01212-9. http://www.springerlink.com/content/k334885x062q5136/
International Peer Reviewed Journal Publications
3. Manjusha Ramakrishnan, Ginu Rajan, Yuliya Semenova, Dean Callaghan, and Gerald Farrell "Investigation of the effect of vibration amplitude on vibration measurements of polarimetric fiber sensors embedded in composite beams” Smart Mater. Struct. Journal, IOP science, 23, no. 4, 2014. http://iopscience.iop.org/0964-1726/23/4/045037
4. G. Rajan, D. Callaghan, Y. Semenova, and G. Farrell, "Photonic Crystal Fiber Sensors for Minimally Invasive Surgical Devices," Biomedical Engineering, IEEE Transactions on, vol. 59, pp. 332-338, 2012. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6099602
5. Dean J. Callaghan, Mark M. McGrath, Ginu Rajan, Eugene Coyle, Yuliya Semenova and Gerald Farrell “Investigation and experimental measurement of scissor blade cutting forces using fibre Bragg grating sensors” Smart Mater. Struct. Journal, IOP science, 2011. http://iopscience.iop.org/0964-1726/20/10/105004
6. G. Rajan, D. Callaghan, Y. Semenova, M. McGrath, E. Coyle, and G. Farrell, "A Fiber Bragg Grating-Based All-Fiber Sensing System for Telerobotic Cutting Applications," Sensors Journal, IEEE, vol. 10, pp. 1913-1920, 2010. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5482041
7. D.J. Callaghan, M.M. McGrath and E. Coyle, "A Force Measurement Evaluation Tool for Telerobotic Cutting Applications: Development of an Effective Characterization Platform " International Journal of Mathematical, Physical and Engineering Sciences, vol. 1, pp. 144-150, 2007. http://www.waset.org/journals/ijmpes/v1.php
Peer Reviewed Conference Publications
8. G. Rajan, S. Mathews, D. Callaghan, G. Farrell and G-Ding Peng “Polymer fiber Bragg grating force sensors for minimally invasive surgical devices” Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96551E (July 1, 2015), http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2388829
9. S. Mathews, D. Callaghan, Y. Semenova, G. Rajan, G. Farrell, "Photonic crystal fiber strain sensors for laparoscopic surgical devices", Proc. Photonics Global Conference, Singapore, 13-16 Dec. 2012.
10. S. J. Mathews, Y. Semenova, G. Rajan, D. Callaghan, and G. Farrell, "Temperature Insensitive Miniature Photonic Crystal Fiber Interferometric (PCFI) Strain Sensors," in International Conference on Fibre Optics and Photonics, p. T2C. 4., Dec. 2012.
11. D.J. Callaghan, Mark M. McGrath, Ginu Rajan, Eugene Coyle, Yuliya Semenova and Gerald Farrell, “Comparing FBG and PCF Force Sensors in a Laparoscopic Smart Surgical Scissor Instrument” Proceedings of the Joint Workshop on New Technologies for Computer/Robot Assisted Surgery, Graz University of Technology, 11-13 July 2011.
12. G. Rajan, D. Callaghan, Y. Semenova and G. Farrell, “Miniature Temperature Insensitive Fiber Optic Sensors for Minimally Invasive Surgical Devices”, 21st Int. Conference on Optical Fiber Sensors, Ottowa, 15-19 May 2011.
13. D.J. Callaghan, M.M. McGrath and E. Coyle, "Measurement of Surgical Instrument-Biological Tissue Interaction Forces: Sensor Requirements" Proceedings of the Fourteenth Annual Conference of Bioengineering in Ireland, pp. 53, Sligo, 2008.
14. D.J. Callaghan, M.M. McGrath and E. Coyle, "Comparison of Force Sensing Technologies for a Haptic Feedback Application" Proceedings of the Northern Ireland Biomedical Engineering Society 28th Annual Spring Meet, P. 10, University of Ulster, 2008.
15. D.J. Callaghan, M.M. McGrath and E. Coyle, " Force Measurement Methods in Telerobotic Surgery: Implications for End-Effector Manufacture," 25th International Manufacturing Conference (IMC25), pp. 389-398, Dublin Institute of Technology, 2008.
16. D.J. Callaghan, and M.M. McGrath, “Real-Time Measurement & Angular Position Control of Horizontal Platforms,” 24th International Manufacturing Conference (IMC24), pp. 1105-1112, Waterford Institute of Technology, 2007.
17. D.J. Callaghan, M.M. McGrath and E. Coyle, " Force Measurement & Evaluation for Surgical Cutting Applications: Development of an Effective Characterization Testbed " Proceedings of the 11th Annual Sir Bernard Crossland Symposium and Postgraduate Research Workshop, pp. 89–107, University of Limerick, 2008.