Contact Dr Tom Charrett
- Tel: +44 (0) 1234 758205
- Email: t.charrett@cranfield.ac.uk
- ORCID
Areas of expertise
- Instrumentation, Sensors and Measurement Science
- Sensor Technologies
Background
Dr Charrett is an experienced researcher in optical sensor and instrumentation development. He has a PhD from Cranfield University into the development of imaging Laser Doppler velocimetry instrumentation (2003-2006). He is a trained physicist with a MPhys (Hons) in Physics with Space Science and Technology (University of Leicester, 2002).
Dr Charrett joined Cranfield in 2006 as a Research Fellow progressing to Lecture in Optical sensors in 2015. He has been engaged in a variety of research projects within the Centre for Engineering Photonics, and has experience and expertise in instrumentation research, including image and signal processing, interferometry and laser speckle techniques.
Current activities
Dr Charrett is a Lecturer in Optical Sensors based in the Centre for Engineering Photonics.
Current research interests include those funded by the Engineering and Physical Sciences Research Council (EPSRC) into the development and application of novel manufacturing instrumentation including:
- Optical fibre interferometry for welding additive manufacturing and laser processing
- Combined interferometry and laser speckle correlation for multi-degree of freedom robotic position and orientation sensing
- Optical fibre sensors for manufacturing robotics.
- Multi-wavelength laser speckle for orientation measurement
He also has research interests in:
- The development and application of novel laser speckle instrumentation; including laser speckle velocimetry for autonomous vehicle navigation and manufacturing robotics tool speed measurement.
- Speckle interferometry for object strain and shape measurements (Electronic speckle pattern interferometry, shearography).
- Novel signal/image processing approaches in laser speckle sensing.
- Full field imaging flow measurement instrumentation, including Planar Doppler velocimetry (PDV) / Interferometric Planar Doppler velocimetry (IPDV). Particle imaging velocimetry (PIV) and Filtered Rayleigh scattering (FRS)
- Optical coherence tomography for micro-fluidic channel structure, flow measurement, and online monitoring of fibre composite layup.
Clients
- Engineering and Physical Sciences Research Council
- Airbus SE
- Oxford Instruments PLC
- Manufacturing Technology Centre
- Alphasense Inc
Publications
Articles In Journals
- Gibson SJ, Charrett TOH & Tatam RP. (2023). Absolute angle measurement using dual-wavelength laser speckle: theory and method. Optics and Lasers in Engineering, 174
- Qin J, Vives J, Raja P, Lasisi S, Wang C, .... (2023). Automated interlayer wall height compensation for wire based directed energy deposition additive manufacturing. Sensors, 23(20)
- Hallam JM, Kissinger T, Charrett TOH & Tatam RP. (2022). In-process range-resolved interferometric (RRI) 3D layer height measurements for wire+ arc additive manufacturing (WAAM). Measurement Science and Technology, 33(4)
- James SW, Kissinger T, Weber S, Mullaney K & Chehura E. (2022). Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 1. Measurement of strain. Smart Materials and Structures, 31(7)
- Kissinger T, James SW, Weber S, Mullaney K, Chehura E, .... (2022). Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: 2. Measurement of shape. Smart Materials and Structures, 31(7)
- Hallam JM, Rigas E, Charrett TOH & Tatam RP. (2020). 2D spatially-resolved depth-section microfluidic flow velocimetry using dual beam OCT. Micromachines, 11(4)
- Charrett TOH & Tatam RP. (2019). Performance and analysis of feature tracking approaches in laser speckle instrumentation. Sensors, 19(10)
- Rigas E, Hallam JM, Charrett TOH, Ford HD & Tatam RP. (2019). Metre-per-second microfluidic flow velocimetry with dual beam optical coherence tomography. Optics Express, 27(17)
- Charrett TOH, Bandari YK, Michel F, Ding J, Williams SW, .... (2018). A non-contact laser speckle sensor for the measurement of robotic tool speed. Robotics and Computer-Integrated Manufacturing, 53
- Kissinger T, Correia RN, Charrett TOH, James SW & Tatam RP. (2016). Fibre segment interferometry for dynamic strain measurements. Journal of Lightwave Technology, 34(19)
- Charrett TOH & Tatam RP. (2015). Full-field interferometry using infinity corrected optics. Measurement Science and Technology, 27(1)
- Kissinger T, Charrett TOH & Tatam RP. (2015). Range-resolved interferometric signal processing using sinusoidal optical frequency modulation. Optics Express, 23(7)
- Charrett TOH & Tatam RP. (2014). Objective speckle displacement: an extended theory for the small deformation of shaped objects. Optics Express, 22(21)
- Charrett TOH, Bledowski IA, James SW & Tatam RP. (2014). Frequency division multiplexing for interferometric planar Doppler velocimetry. Applied Optics, 53(20)
- Bledowski IA, Charrett TOH, Francis D, James SW & Tatam RP. (2013). Frequency-division multiplexing for multicomponent shearography. Applied Optics, 52(3)
- Kissinger T, Charrett TOH & Tatam RP. (2013). Fibre segment interferometry using code-division multiplexed optical signal processing for strain sensing applications. Measurement Science and Technology, 24(9)
- Charrett TOH, James SW & Tatam RP. (2012). Optical fibre laser velocimetry: a review. Measurement Science and Technology, 23(3)
- Francis D, Charrett TOH, Waugh L & Tatam RP. (2012). Objective speckle velocimetry for autonomous vehicle odometry. Applied Optics, 51(16)
- Charrett TOH, Francis D & Tatam RP. (2011). Quantitative shearography: error reduction by using more than three measurement channels. Applied Optics, 50(2)
- Charrett TOH, Waugh L & Tatam RP. (2010). Speckle velocimetry for high accuracy odometry for a Mars exploration rover. Measurement Science and Technology, 21(2)
- Lu Z-H, Charrett TOH & Tatam RP. (2009). Three-component planar velocity measurements using Mach–Zehnder interferometric filter-based planar Doppler velocimetry (MZI-PDV). Measurement Science and Technology, 20(3)
- Lu ZH, Charrett TOH, Ford HD & Tatam RP. (2008). Mach-Zehnder interferometric filter based planar Doppler velocimetry (MZI-PDV). Journal of Optics A: Pure and Applied Optics, 9(11)
- Charrett TOH, Nobes DS & Tatam RP. (2007). Investigation into the selection of viewing configurations for three-component planar Doppler velocimetry measurements. Applied Optics, 46(19)
- Charrett TOH & Tatam RP. (2006). Single camera three component planar velocity measurements using two-frequency planar Doppler velocimetry (2ν-PDV). Measurement Science and Technology, 17(5)
- Charrett TOH, Ford HD, Nobes DS & Tatam RP. (2004). Two-frequency planar Doppler velocimetry (2ν-PDV). Review of Scientific Instruments, 75(11)
Conference Papers
- Gibson SJ, Charrett TOH & Tatum RP. (2024). Towards high resolution absolute angle sensing using dual-wavelength laser speckle
- Charrett TOH, Gibson S & Tatam RP. (2023). Application and performance of laser speckle odometry applied to a mobile industrial robot
- James SW, Kissinger T, Weber S, Mullaney K, Chehura E, .... (2023). Dynamic Measurement of Strain and Shape on a Rotating Helicopter Rotor Blade: The Measurement Challenge
- Pillai S, Charrett TOH, Kissinger T, Barrington JH, James SW, .... (2023). Optical Fibre Based Angle Measurement for Robotic Joints
- Pillai S, Charrett TOH, Kissinger T, James SW & Tatam RP. (2023). A fibre optic angle sensing tape for applications in robotics and automation
- Gibson SJ, Charrett TOH & Tatam RP. (2019). Absolute angle measurement using dual-wavelength laser speckle for robotic manufacturing
- Charrett TOH, Kissinger T & Tatam RP. (2019). Multi degree-of-freedom position sensing by combination of laser speckle correlation and range-resolved interferometry
- Charrett TOH, Kissinger T & Tatam RP. (2019). Workpiece positioning sensor (wPOS): A three-degree-of-freedom relative end-effector positioning sensor for robotic manufacturing
- Hallam JM, Rigas E, Ford HD, Charrett T & Tatam RP. (2018). Dual sensing-light-sheet OCT for microfluidic PTV
- Rigas E, Hallam JM, Ford HD, Charrett TOH & Tatam RP. (2018). Dual-channel OCT for velocity measurement in microfluidic channels.
- Charrett TOH, Kotowski K & Tatam RP. (2017). Speckle tracking approaches in speckle sensing
- Charrett TOH, Bandari YK, Michel F, Ding J, Williams SW, .... (2017). Laser speckle velocimetry for robot manufacturing
- Kissinger T, Charrett TOH, James SW, Adams A, Twin A, .... (2016). Characterisation of a cryostat using simultaneous, single-beam multiple-surface laser vibrometry
- Bandari YK, Charrett TOH, Michel F, Ding J, Williams SW, .... (2016). Compensation strategies for robotic motion errors for additive manufacturing (AM)
- Kissinger T, Correia RN, Charrett TOH, James SW & Tatam RP. (2015). Range-resolved signal processing for fibre segment interferometry applied to dynamic long-gauge length strain sensing
- Charrett TOH & Tatam RP. (2015). Objective speckle displacement resulting from the deformation of shaped objects
- Kissinger T, Goncalves Correia R, Charrett T, James S & Tatam R. (2015). Multiplexing of long-gauge length fibre optic dynamic strain sensors using range-resolved interferometry
- Kissinger T, Charrett TOH, James SW & Tatam RP. (2015). Cost-effective vibration and displacement measurement using range-resolved interferometry
- Kissinger T, Charrett TOH, James SW, Adams A, Twin A, .... (2015). Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry
- Francis D, Charrett TOH, Waugh L & Tatam RP. (2012). Speckle velocimetry for odometry measurements of autonomous vehicles
- Kissinger T, Charrett TOH & Tatam RP. (2012). Range-resolved single-sideband optical fibre interferometry for quasi-distributed dynamic strain sensing
- Charrett TOH & Tatam RP. (2009). Fringe 2009
- Charrett TOH, Francis D & Tatam RP. (2009). Laser speckle metrology for high accuracy odometry and quantitative surface strain measurements
- Charrett TOH & Tatam RP. (2009). Speckle velocimetry for high accuracy and multidimensional odometry
- Charrett TOH & Tatam RP. (2009). Speckle velocimetry for high accuracy and multidimensional odometry
- Lu ZH, Charrett TOH, Ford HD & Tatam RP. (2008). 3D planar velocity measurements using Mach-Zehnder interferometric-filter-based planar Doppler velocimetry (MZI-PDV) and imaging fibre bundles
- Lu ZH, Charrett TOH, Ford HD & Tatam RP. (2008). Mach–Zehnder interferometric filter based planar Doppler velocimetry (MZI-PDV)
- Lu Z-H, Charrett TOH, Ford HD & Tatam RP. (2007). Planar Doppler velocimetry using a Mach-Zehnder interferometric filter
- Charrett TOH, Ford HD & Tatam RP. (2006). Single camera 3D planar Doppler velocity measurements, using two frequency planar Doppler velocimetry (2v-PDV) and imaging fibre bundles
- Charrett TOH, Ford HD & Tatam RP. (2006). Single camera 3D planar Doppler velocity measurements using imaging fibre bundles
- Charrett TO, Ford HD & Tatam RP. (2005). Single camera 3D planar velocity measurements using imaging fibre bundles and two frequency Planar Doppler Velocimetry (2nu-PDV)
- Charrett TOH, Ford HD & Tatam RP. (2005). Single camera three component planar velocity measurements, using two frequency Planar Doppler Velocimetry (2ν-PDV)
- Charrett TOH, Ford HD, Nobes DS & Tatam RP. (2003). Dual-illumination planar Doppler velocimetry using a single camera