A5044800572- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Optical Coherence Tomography Applications
- Ionosphere and magnetosphere dynamics
- Advanced Fluorescence Microscopy Techniques
- GNSS positioning and interference
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Statistical and numerical algorithms
- Photoacoustic and Ultrasonic Imaging
- Microfluidic and Bio-sensing Technologies
- Additive Manufacturing Materials and Processes
- Optical measurement and interference techniques
- Mechanical and Optical Resonators
- Welding Techniques and Residual Stresses
- Diverse Education Studies and Reforms
- Additive Manufacturing and 3D Printing Technologies
Cranfield University
2018-2023
University of Leicester
2015-2016
University of Birmingham
2008-2013
Cardiff University
2011
Carleton College
2011
California Institute of Technology
2011
Andrews University
2011
Australian National University
2011
Charles Sturt University
2011
LIGO Scientific Collaboration
2011
The advanced interferometer network will herald a new era in observational astronomy. There is very strong science case to go beyond the detector and build detectors that operate frequency range from 1 Hz-10 kHz, with sensitivity factor ten better amplitude. Such be able probe of topics nuclear physics, astronomy, cosmology fundamental providing insights into many unsolved problems these areas.
Abstract There is a need for improved techniques nowcasting and forecasting (over several hours) HF propagation at northerly latitudes to support airlines operating over the increasingly popular trans‐polar routes. In this paper assimilation of real‐time measurements into model developed by authors described, including ionosonde total electron content (TEC) define main parameters ionosphere. The effects D region absorption in polar cap auroral regions are integrated with through satellite...
Abstract In this work a range resolved interferometry (RRI) instrument for absolute distance measurements is integrated into wire + arc additive manufacturing (WAAM) system to provide in-process monitoring of layer height, and prospects volume profile are discussed. experiment titanium feedstock was used create 150 mm long, 13.5 high wall comprised 11 WAAM deposited layers. The RRI in very good agreement ( <?CDATA $\lt$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Alternative curricula at Key Stage 4 have been implemented to help young people who may be disaffected from school re‐engage with learning. Skill Force is one example of an alternative curriculum. a Ministry Defence (MoD) sponsored youth initiative which offers 14‐ 16‐year‐old students key skills based vocational the traditional This research explored pupils' perceptions participation in and perceived impact on their motivation, attitudes school, attendance, exclusions, behaviour,...
All-reflective optical systems are under consideration for future gravitational wave detector topologies. A key feature of these all-reflective is the use Fabry-Perot cavities with diffraction gratings as input couplers; however, theory predicts and experiment has shown that translation grating surface across incident laser light will introduce additional phase into system. This can be induced through simple side-to-side motion coupler, yaw coupler around a central point (i.e., rotation...
A novel dual beam Optical Coherence Tomography (OCT) instrument has been developed for high velocity flow measurement, principally in microfluidics applications. The scanned approach creates a pair of image-frames separated by small spatiotemporal offset. Metre-per-second measurement is achieved rapid re-imaging the second allowing particle tracking between each image-frame pair. Flow at 1.06 m/s using single optical access port measured, more than two orders magnitude larger previously...
Abstract This paper describes the steps taken to improve measurement speed of a combined low-coherence and confocal refractive index system. The instrument measures thickness transparent plates using fibre-based interferometer with line-scan spectrometer. spectrometer allows on-line dispersion which is necessary derive sample t as well both phase group indices n p , g . measurements were performed on six surfaces consisting three glass windows mounted in lens tube. Experimental results show...
Part quality monitoring and control in wire-based directed energy deposition additive manufacturing (w-DEDAM) processes has been garnering continuous interest from both the academic industrial sectors. However, maintaining a consistent layer height ensuring that wall aligns closely with design, as depicted computer-aided design (CAD) models, pose significant challenges. These challenges arise due to uncertainties associated process working environment, particularly extended processing times....
Confocal scanning combined with low-coherence interferometry is used to provide remote refractive index and thickness measurements of transparent materials. The influence lens aberrations in the confocal measurement assessed through ray-trace modeling axial point-spread functions generated using optical configurations comprised paired aspherics achromats. Off-axis parabolic mirrors are suggested as an alternative lenses shown exhibit much more symmetric profiles provided system numerical...
A dual beam optical coherence tomography (OCT) instrument has been developed for flow measurement that offers advantages over microscope derived imaging techniques. It requires only a single access port, allows simultaneous of the microfluidic channel, does not require fluorescent seed particles, and can provide millimetre-deep depth-section velocity profile (as opposed to horizontal-section). The performs rapid re-sampling particle positions, allowing faster flows. In this paper, we develop...
All-reflective configurations have been suggested for future laser-interferometric gravitational wave detectors. Diffraction gratings would be required as core elements of any such design. In this paper, coupling lateral grating displacement to the output ports a diffractive Fabry-Perot cavity was derived using steady-state technique. The signal noise ratio versus potential compared each port. For featuring parameters similar planned Advanced Virgo instrument, we found forward-reflected port...
Low-coherence interferometry is combined with confocal scanning to provide remote refractive index and thickness measurements of transparent materials. The influence lens aberrations in the measurement assessed through investigation axial point-spread functions (APSFs) generated using optical configurations comprised paired aspherics achromats. Off-axis parabolic mirrors are suggested as an alternative lenses shown exhibit much more symmetric APSFs provided system numerical aperture not too...
The authors have previously reported on the development of an HF propagation model for signals reflected from northerly regions ionosphere, and its validation by comparison with measurements made over a number paths within polar cap, crossing auroral oval, along mid-latitude trough. incorporates various features (e.g. convecting patches enhanced plasma density) ionosphere that are, in particular, responsible off-great circle can lead to at times frequencies not expected on-great alone....
A novel dual beam Optical Coherence Tomography (OCT) system is presented for microfluidics applications. The sensing-light-sheet approach here achieves high velocity flow measurement because the rapid re-imaging by second allows particle tracking between each image-frame of pair. We have demonstrated measurements microchannel using 10 μm particles in a 700 deep channel with peak velocities approximately 0.28 metres-per-second (m/s), two orders magnitude higher than previously reported OCT...
A dual-beam Optical Coherence Tomography system has been developed, using a bespoke dual optical fibre, to simultaneously image microfluidic channel structures and measure high velocity flows (presently 250μm/s) from single access point.