Mr. Ian E. Ashdown Profile

Ian E. Ashdown

President/Senior Research Scientist at byHeart Consultants Ltd

SPIE Involvement:

Author

Proceedings Article | 30 September 2013 Paper

Data format standard for sharing light source measurements

G. Groot Gregory, Ian Ashdown, Willi Brandenburg, Dominique Chabaud, Oliver Dross, Sanjay Gangadhara, Kevin Garcia, Michael Gauvin, Dirk Hansen, Kei Haraguchi, Günther Hasna, Jianzhong Jiao, Ryan Kelley, John Koshel, Julius Muschaweck

Proceedings Volume 8835, 88350D (2013) https://doi.org/10.1117/12.2021670

KEYWORDS: Computer aided design, Light sources, Data modeling, Ray tracing, Optical design, Light emitting diodes, Manufacturing, Binary data, Optical testing, Solid modeling

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Proceedings Article | 14 September 2007 Paper

Adapting radio technology to LED feedback systems

Marc Salsbury, Ian Ashdown

Proceedings Volume 6669, 666912 (2007) https://doi.org/10.1117/12.732522

KEYWORDS: Light emitting diodes, Electronic filtering, Receivers, Linear filtering, Homodyne detection, Solid state lighting, Modulation, Bandpass filters, Blue light emitting diodes, Heterodyning

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Proceedings Article | 14 September 2007 Paper

Pseudorandom pulse code modulation of LEDs

Ion Toma, Bojana Bjeljac, Ian Ashdown

Proceedings Volume 6669, 666918 (2007) https://doi.org/10.1117/12.732531

KEYWORDS: Light emitting diodes, Modulation, Acoustics, Magnetostrictive materials, Microcontrollers, Power supplies, Clocks, Transformers, Visualization, Digital electronics

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Proceedings Article | 14 September 2007 Paper

A comprehensive model to predict solid state lighting performance

Marc Salsbury, Ian Ashdown

Proceedings Volume 6669, 666919 (2007) https://doi.org/10.1117/12.732528

KEYWORDS: Light emitting diodes, Solid state lighting, Photodiodes, Performance modeling, Data modeling, Thermal modeling, Thermography, Systems modeling, Blue light emitting diodes, Resistance

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Proceedings Article | 14 September 2007 Paper

Peak wavelength shifts and opponent color theory

Ian Ashdown, Marc Salsbury

Proceedings Volume 6669, 66690C (2007) https://doi.org/10.1117/12.732504

KEYWORDS: Sensors, Light emitting diodes, Optical filters, Blue light emitting diodes, Infrared radiation, Cones, LCDs, Color vision, Brain, Green light emitting diodes

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Proceedings Article | 12 September 2006 Paper

Accurate colorimetric feedback for RGB LED clusters

Kwong Man, Ian Ashdown

Proceedings Volume 6337, 633702 (2006) https://doi.org/10.1117/12.683239

KEYWORDS: Light emitting diodes, RGB color model, Temperature metrology, Thermal modeling, Aluminium gallium indium phosphide, Lamps, Indium gallium nitride, Systems modeling, LED lighting, Blue light emitting diodes

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Proceedings Article | 12 September 2006 Paper

Polychromatic optical feedback control, stability, and dimming

Shane Robinson, Ian Ashdown

Proceedings Volume 6337, 633714 (2006) https://doi.org/10.1117/12.679678

KEYWORDS: Light emitting diodes, Photodiodes, Lamps, Feedback control, Temperature metrology, Feedback loops, Manufacturing, Optical filters, Control systems, Linear filtering

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Proceedings Article | 12 September 2006 Paper

Extended parallel pulse code modulation of LEDs

Ian Ashdown

Proceedings Volume 6337, 63370W (2006) https://doi.org/10.1117/12.679674

KEYWORDS: Light emitting diodes, Modulation, Microcontrollers, Light sources, Clocks, Analog electronics, Multiplexers, Light sources and illumination, Field programmable gate arrays, Electromagnetic coupling

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Proceedings Article | 12 September 2006 Paper

Binning and filtering: the six-color solution

Ian Ashdown, Shane Robinson, Marc Salsbury

Proceedings Volume 6337, 63371A (2006) https://doi.org/10.1117/12.680823

KEYWORDS: Light emitting diodes, LCDs, LED backlight, Optical filters, LED lighting, RGB color model, Televisions, Lamps, Solid state lighting, Manufacturing

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Proceedings Article | 17 July 2006 Paper

A near-field goniospectroradiometer for LED measurements

Ian Ashdown, Marc Salsbury

Proceedings Volume 6342, 634215 (2006) https://doi.org/10.1117/12.692272

KEYWORDS: Light emitting diodes, Near field, Cameras, Light sources, Optical design, Optical spheres, Image sensors, Goniophotometry, Light, Digital cameras

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Proceedings Article | 26 January 2004 Paper

Neural networks for LED color control

Ian Ashdown

Proceedings Volume 5187, (2004) https://doi.org/10.1117/12.504838

KEYWORDS: Neurons, Sensors, Neural networks, Light emitting diodes, Manufacturing, Light sources and illumination, Tolerancing, Temperature metrology, Lamps, Control systems

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Proceedings Article | 26 November 2002 Paper

Chromaticity and color temperature for achitectural lighting

Ian Ashdown

Proceedings Volume 4776, (2002) https://doi.org/10.1117/12.457165

KEYWORDS: Light emitting diodes, Lamps, Light sources and illumination, Light sources, Manufacturing, Metals, CIE 1931 color space, Black bodies, Tolerancing, Ultraviolet radiation

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