Dr. Daniel Francis Profile

Dr. Daniel Francis

Research Fellow at Cranfield Univ

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Publications (10)

Proceedings Article | 21 June 2019 Presentation + Paper

The use of parabolic mirrors in combined low-coherence and confocal refractive index measurement

Daniel Francis, Helen Ford, Jonathan Hallam, Ralph Tatam

Proceedings Volume 11056, 1105610 (2019) https://doi.org/10.1117/12.2525986

KEYWORDS: Mirrors, Confocal microscopy, Refractive index, Aspheric lenses, Monochromatic aberrations, Interfaces, Interferometry, Off axis mirrors, Interferometers, Spectroscopy

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Proceedings Article | 9 May 2018 Presentation + Paper

In-situ pathlength calibration of integrating spheres used in measurement of absorbance

J. Hodgkinson, S. Bergin, D. Francis, D. Masiyano, N. Davis, S. Staines, R. Tatam

Proceedings Volume 10680, 106800C (2018) https://doi.org/10.1117/12.2306655

KEYWORDS: Integrating spheres, Optical spheres, Calibration, Reflectivity, Speckle, Sensors, Absorbance, Absorption, Spectroscopy, Methane

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Proceedings Article | 9 May 2018 Paper

Refractive index and dispersion measurement using low-coherence interferometry with broadband confocal scanning

Daniel Francis, Helen Ford, Ralph Tatam

Proceedings Volume 10680, 106801I (2018) https://doi.org/10.1117/12.2306391

KEYWORDS: Confocal microscopy, Refractive index, Spectroscopy, Interferometry, Mirrors, Interferometers, Diodes, Light sources, Reflection, Dispersion

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Proceedings Article | 17 February 2017 Paper

Mid-IR spectroscopic instrumentation for point-of-care diagnosis using a hollow silica waveguide gas cell

Daniel Francis, Jane Hodgkinson, Christopher Walton, Jeremy Sizer, Paul Black, Beth Livingstone, Dawn Fowler, Mitesh Patel, Ralph Tatam

Proceedings Volume 10072, 1007209 (2017) https://doi.org/10.1117/12.2253074

KEYWORDS: Spectroscopes, Point-of-care devices, Silica, Waveguides, Quantum cascade lasers, Mid-IR, Laser spectroscopy, Optical gas detection, Diagnostics, Sensing systems, Methane, Absorption, Sensors

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Proceedings Article | 29 April 2016 Paper

Sensitive detection of methane at 3.3 µm using an integrating sphere and interband cascade laser

N. Davis, J. Hodgkinson, D. Francis, R. Tatam

Proceedings Volume 9899, 98990M (2016) https://doi.org/10.1117/12.2227131

KEYWORDS: Methane, Gases, Integrating spheres, Absorption, Signal detection, Tunable diode lasers, Laser spectroscopy, Spectroscopy, Optical spheres, Absorbance, Sensors, Target detection, Gold

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Proceedings Article | 13 May 2015 Paper

A method for continuous in-situ pathlength calibration of integrating sphere based gas cells

S. Bergin, J. Hodgkinson, D. Francis, R. Tatam

Proceedings Volume 9486, 94860G (2015) https://doi.org/10.1117/12.2176225

KEYWORDS: Optical spheres, Absorption, Sensors, Integrating spheres, Calibration, Light sources, Methane, Contamination, Tunable diode lasers, Spectroscopy

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Proceedings Article | 2 June 2014 Paper

Palladium coated ball lens for optical fibre refractometry based hydrogen sensing

Sahar Chowdhury, Ricardo Correia, Daniel Francis, Simon Brooks, Ben J. Jones, Alexander W. Thompson, Jane Hodgkinson, Ralph Tatam

Proceedings Volume 9157, 9157AP (2014) https://doi.org/10.1117/12.2059604

KEYWORDS: Refractive index, Palladium, Sensors, Hydrogen, Optical fibers, Head, Wavefronts, Refractometry, Micromirrors, Superluminescent diodes

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Proceedings Article | 11 August 2008 Paper

Development of a multi-component shearography instrument for surface strain measurement on dynamic objects

D. Francis, S. James, R. Tatam

Proceedings Volume 7063, 706308 (2008) https://doi.org/10.1117/12.796273

KEYWORDS: Cameras, Phase measurement, Shearography, Interferometers, Composites, CCD cameras, Fringe analysis, Image processing, Mirrors, Shearing interferometers

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Proceedings Article | 16 May 2008 Paper

Surface strain measurement of rotating objects using shearography instrumentation based on fibre-optic imaging bundles

D. Francis, S. James, R. Tatam

Proceedings Volume 7004, 70043U (2008) https://doi.org/10.1117/12.786785

KEYWORDS: Shearography, Speckle pattern, CCD cameras, Pulsed laser operation, Shearing interferometers, Speckle, Cameras, Fourier transforms, Aluminum, Interferometry

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Proceedings Article | 18 June 2007 Paper

Measurement of surface strain using multi-component pulsed laser shearography with coherent fibre-optic bundles

D. Francis, S. James, R. Tatam

Proceedings Volume 6616, 66162S (2007) https://doi.org/10.1117/12.725444

KEYWORDS: Shearography, Mirrors, Cameras, Fringe analysis, Pulsed laser operation, CCD cameras, Phase measurement, Speckle pattern, Image processing, Shearing interferometers

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Showing 5 of 10 publications

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