Mr. Raymond P. McCue Profile

Raymond P. McCue

at Faz Technology Ltd

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Author

Publications (4)

Proceedings Article | 12 July 2019 Open Access

Demonstration of strain independent temperature measurements using optical PM-FBG sensors for ground testing of satellite panels

Selwan Ibrahim, Raymond McCue, John O'Dowd, Martin Farnan, Devrez Karabacak

Proceedings Volume 11180, 111807B (2019) https://doi.org/10.1117/12.2536182

KEYWORDS: Sensors, Temperature metrology, Calibration, Environmental sensing, Atmospheric sensing, Fiber Bragg gratings, Atmospheric optics, Satellites, Optical testing, Optical sensors

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Proceedings Article | 11 April 2019 Presentation + Paper

Design challenges of a birefringent FBG optical sensing system

Selwan Ibrahim, Raymond McCue, John O'Dowd, Martin Farnan

Proceedings Volume 11028, 1102806 (2019) https://doi.org/10.1117/12.2520604

KEYWORDS: Sensors, Temperature metrology, Calibration, Fiber Bragg gratings, Coating, Polarization, Gold, Atmospheric sensing, Sensor calibration, Optical testing, Fiber Bragg grating interrogators, Fiber optics sensors, Polarization maintaining fibers, Birefringence, Environmental sensing

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Proceedings Article | 25 September 2017 Open Access

Design challenges of a tunable laser interrogator for geo-stationary communication satellites

Selwan Ibrahim, Arthur Honniball, Raymond McCue, Michael Todd, John O’Dowd, David Sheils, Liberis Voudouris, Martin Farnan, Andreas Hurni, Philipp Putzer, Norbert Lemke, Markus Roner

Proceedings Volume 10562, 105620Y (2017) https://doi.org/10.1117/12.2296150

KEYWORDS: Sensors, Fiber Bragg gratings, Fabry–Perot interferometers, Temperature metrology, Tunable lasers, Polarization, Absorption, Fiber optics sensors, Satellites, Radiation effects

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Recently optical sensing solutions based on fiber Bragg grating (FBG) technology have been proposed for temperature monitoring in telecommunication satellite platforms with an operational life time beyond 15 years in geo-stationary orbit. Developing radiation hardened optical interrogators designed to be used with FBG sensors inscribed in radiation tolerant fibers offer the capabilities of multiplexing multiple sensors on the same fiber and reducing the overall weight by removing the copper wiring harnesses associated with electrical sensors.

Here we propose the use of a tunable laser based optical interrogator that uses a semiconductor MG-Y type laser that has no moving parts and sweeps across the C-band wavelength range providing optical power to FBG sensors and optical wavelength references such as athermal Etalons and Gas Cells to guarantee stable operation of the interrogator over its targeted life time in radiation exposed environments. The MG-Y laser was calibrated so it remains in a stable operation mode which ensures that no mode hops occur due to aging of the laser, and/or thermal or radiation effects.

The key optical components including tunable laser, references and FBGs were tested for radiation tolerances by emulating the conditions on a geo-stationary satellite including a Total Ionizing Dose (TID) radiation level of up to 100 krad for interrogator components and 25 Mrad for FBGs.

Different tunable laser control, and signal processing algorithms have been designed and developed to fit within specific available radiation hardened FPGAs to guarantee operation of a single interrogator module providing at least 1 sample per second measurement capability across <20 sensors connected to two separate optical channels.

In order to achieve the required temperature specifications of ±0.5°C across a temperature range of -20°C to +65°C using femtosecond inscribed FBGs (fs-FBG), a polarization switch is used to mitigate for the polarization dependent frequency shift (PDFS) induced from fs-FBG which could be in the order of < 20 pm causing < 2°C error in the measurement. Also special transducers were designed to isolate the strain from the FBGs to reduce any strain influence on the FBG temperature measurements while ensuring high thermal conductivity.

In this paper we demonstrate the operation of an optical FBG interrogator as part of a hybrid sensor bus (HSB) engineering model system developed in the frame of an ESA-ARTES program and is planned to be deployed as a flight demonstrator on-board the German Heinrich Hertz geo-stationary satellite.

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Proceedings Article | 27 August 2003 Paper

Environmental sensing of hydrocarbons in water using mid-infrared optical fibers

Raymond McCue, James Walsh, Fiona Walsh, Fiona Regan

Proceedings Volume 4876, (2003) https://doi.org/10.1117/12.463965

KEYWORDS: Sensors, Optical fibers, Absorption, Infrared radiation, Coating, Waveguides, Mid-IR, Interfaces, Absorbance, Environmental sensing

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