Low-cost fully integrated fiber Bragg grating interrogation system

Fiber Bragg gratings can be used for monitoring different parameters in a wide variety of materials and constructions. The interrogation of fiber Bragg gratings traditionally consists of an expensive and spacious peak tracking or spectrum analyzing unit which needs to be deployed outside the monitored structure. We present a dynamic low-cost interrogation system for fiber Bragg gratings which can be integrated with the fiber itself, limiting the fragile optical in- and outcoupling interfaces and providing a compact, unobtrusive driving and read-out unit. The reported system is based on an embedded Vertical Cavity Surface Emitting Laser (VCSEL) which is tuned dynamically at 1 kHz and an embedded photodiode. Fiber coupling is provided through a dedicated 45° micromirror yielding a 90° in-the-plane coupling and limiting the total thickness of the fiber coupled optoelectronic package to 550 µm. The red-shift of the VCSEL wavelength is providing a full reconstruction of the spectrum with a range of 2.5 nm. A few-mode fiber with fiber Bragg gratings at 850 nm is used to prove the feasibility of this low-cost and ultra-compact interrogation approach.

Optical fiber sensors embedded in flexible polymer foils

In traditional electrical sensing applications, multiplexing and interconnecting the different sensing elements is a major challenge. Recently, many optical alternatives have been investigated including optical fiber sensors of which the sensing elements consist of fiber Bragg gratings. Different sensing points can be integrated in one optical fiber solving the interconnection problem and avoiding any electromagnetical interference (EMI). Many new sensing applications also require flexible or stretchable sensing foils which can be attached to or wrapped around irregularly shaped objects such as robot fingers and car bumpers or which can even be applied in biomedical applications where a sensor is fixed on a human body. The use of these optical sensors however always implies the use of a light-source, detectors and electronic circuitry to be coupled and integrated with these sensors. The coupling of these fibers with these light sources and detectors is a critical packaging problem and as it is well-known the costs for packaging, especially with optoelectronic components and fiber alignment issues are huge. The end goal of this embedded sensor is to create a flexible optical sensor integrated with (opto)electronic modules and control circuitry. To obtain this flexibility, one can embed the optical sensors and the driving optoelectronics in a stretchable polymer host material. In this article different embedding techniques for optical fiber sensors are described and characterized. Initial tests based on standard manufacturing processes such as molding and laser structuring are reported as well as a more advanced embedding technique based on soft lithography processing.

The Booth: Bringing Out the Super Hero in You

Demo paper about the booth

Enhancing public speaking skills - an evaluation of the Presentation Trainer in the wild

Full paper presented at EC-TEL 2016

Geboortehuis van Peter Benoit (1834-1901) te Harelbeke (Westvlaanderen)

Signatur des Originals: S 36/F02981

Geboortehuis van Peter Benoit (1834-1901) te Harelbeke (Westvlaanderen)

Signatur des Originals: S 36/F02982

Begrafenisplechtigheid Van Peter Benoit, Te Antwerpen, 11 Maart 1901, Het Lijk Wordt Uit De Hoofdkerk Gedragen

Signatur des Originals: S 36/F02983

Begrafenisplechtigheid Van Peter Benoit, Te Antwerpen, 11 Maart 1901, Het Lijk Wordt Uit De Hoofdkerk Gedragen

Signatur des Originals: S 36/F02984

Peter I., Peter Iwanow, Marie, van Bett, ein Zimmermann und seine Frau, Figurinen, in: Albert Lortzing: Zar und Zimmermann

Signatur des Originals: S 36/G13836

Alphabetisch register op de nog van kracht zijnde Algemeene orders voor het Nederlandsch-Oostindisch leger. 1832-1894.

Mode of access: Internet.

Specimen antiquario-literarium : de eranis veterum graecorum ; inprimis ex jure attico ... pro gradu doctoratus, summisque in philosophia theoretica et literis humanioribus honoribus ac privilegiis, in academia Lugduno-Batava ... defendet Joannes Jacobus van Holst ... ad diem XXX Juni 1832...

Thesis - Leiden.

Gedenkschriften van Gijsbert Jan van Hardenbroek ... (1747-1787)

Vols. 3-4 edited by A.J. van der Meulen.