Prof. Nicholas J. Goddard Profile

Prof. Nicholas J. Goddard

at Process Instruments (UK) Ltd

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Publications (7)

Proceedings Article | 1 April 2020 Paper

Aqueous photochemistry for the fabrication of grating sensors in hydrogels

Anil Kumar Pal, Nicholas Goddard, Ruchi Gupta

Proceedings Volume 11367, 1136702 (2020) https://doi.org/10.1117/12.2564248

KEYWORDS: Diffraction gratings, Diffraction, Refractive index, Absorbance, Sensors, Waveguides

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Proceedings Article | 21 February 2020 Presentation + Paper

Biosensor for determining average iron content of ferritin by measuring its optical dispersion

Ruchi Gupta, Nasser Alamrani, Gillian Greenway, Nicole Pamme, Nicholas Goddard

Proceedings Volume 11235, 112350M (2020) https://doi.org/10.1117/12.2542162

KEYWORDS: Iron, Proteins, Waveguides, Dispersion, Biosensors, Chemical species, Refractive index, Coating, Point-of-care devices, Visible radiation

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Proceedings Article | 25 February 2010 Paper

High repetition rate femtosecond laser processing of metals

Joerg Schille, Robby Ebert, Udo Loeschner, Patricia Scully, Nicholas Goddard, Horst Exner

Proceedings Volume 7589, 758915 (2010) https://doi.org/10.1117/12.842600

KEYWORDS: Laser ablation, Laser processing, Copper, Aluminum, Pulsed laser operation, Laser damage threshold, Metals, Laser energy, Laser applications, Thermal effects

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Proceedings Article | 2 January 2008 Paper

Microfluidic device for controlled dilution and sorting of droplets by electrokinetic driving forces

P. Carreras, S. Mohr, P. Fielden, N. Goddard

Proceedings Volume 6799, 67990Z (2008) https://doi.org/10.1117/12.769187

KEYWORDS: Microfluidics, Electrodes, Computer aided design, Yeast, Latex, Video, Critical dimension metrology, Liquids, Polymers, Water

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Proceedings Article | 15 September 2005 Paper

Performance analysis underwater hydrophone arrays in tracking maneuvering sea-surface targets

Marcel Hernandez, Nick Goddard

Proceedings Volume 5913, 591314 (2005) https://doi.org/10.1117/12.616720

KEYWORDS: Sensors, Motion models, Target detection, Data modeling, Submerged target detection, Motion measurement, Detection and tracking algorithms, Time metrology, Signal to noise ratio, Monte Carlo methods

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In this paper, we assess the capability of underwater hydrophone (UH) arrays to locate and track manoeuvring targets. A UH array is a horizontal line array of omnidirectional pressure sensors that is deployed on the seabed. The measurements at each UH array are then affected by two idiosyncrasies, termed "source direction ambiguity" and "coning error". In this paper, the posterior Cramer-Rao lower bound(PCRLB) is used as the measure of system performance, providing a bound on the optimal achievable accuracy of target state estimation. We demonstrate the impact of the measurement idiosyncrasies on the PCRLB, with the bound shown to be greater (poorer performance) than when using standard bearings-only sensors. We also include clutter (i.e. we allow each measurement to be either target generated or a false positive), as well as both state-dependent measurement errors and a state-dependent probability of detection. Building on previous work, we show that the measurement origin uncertainty can again be expressed as an information reduction factor (IRF), with this IRF now shown to be a function of both the target range and orientation in relation to each UH array. We consider simulated scenarios that contain features characteristic of recent sea trials conducted by QinetiQ Ltd. The two key features of the trial scenarios is that we have very sparse prior knowledge, and each target has the potential to perform a series of manoeuvres. We use a recent PCRLB formulation for tracking manoeuvring targets that approximates the potentially multi-modal target distribution using a best-fitting Gaussian distribution. We present simulation results for multi-sensor scenarios, demonstrating that this is indeed a difficult tracking problem. Tracking is particularly difficult when the target crosses the line of the UH arrays, making triangulation difficult; and when the target is in the "end-fire" of at least one UH array. It is also difficult to detect and triangulate distant targets. Future work will investigate the tightness of the PCRLB when compared with the performance of state-of-the-art tracking algorithms.

Proceedings Article | 21 June 2002 Paper

Micromolded polymer electrokinetic separation systems with variable volume sampling and integrated optical and conductivity detection

Peter Fielden, Sara Baldock, Nick Goddard, Lee Morrison, Jeff Prest, Bernard Treves Brown, Michele Zgraggen

Proceedings Volume 4626, (2002) https://doi.org/10.1117/12.472109

KEYWORDS: Electrodes, Polymers, Ocean optics, Sensors, Ions, Electro optic polymers, Power supplies, Integrated optics, Resistance, Light sources

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Proceedings Article | 21 May 2001 Paper

Miniaturized isotachophoresis in single-use integrated polymer substrates

Peter Fielden, Sara Baldock, Fatah Bounaira, Nick Goddard, Jeff Prest, Bernard Treves Brown

Proceedings Volume 4265, (2001) https://doi.org/10.1117/12.427972

KEYWORDS: Electrodes, Polymers, Ions, Sensors, Metals, Capillaries, Photoresist materials, Statistical analysis, Silicon, Resistance

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Showing 5 of 7 publications

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