Mr. Thorbjörn C. Buck Profile

Thorbjörn C. Buck

at Technische Univ München

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Publications (10)

Proceedings Article | 21 November 2017 Open Access

A versatile fibre optic sensor interrogation system for the Ariane Launcher based on an electro-optically tuneable laser diode

M. Plattner, F. Hirth, M. Müller, L. Hoffmann, T. Buck, A. Koch

Proceedings Volume 10566, 105661D (2017) https://doi.org/10.1117/12.2308218

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Proceedings Article | 20 November 2017 Open Access

Development of fiber optic sensing interrogators for launchers

M. Plattner, T. Buck, B. Eder, A. Reutlinger, I. McKenzie

Proceedings Volume 10565, 1056518 (2017) https://doi.org/10.1117/12.2309165

KEYWORDS: Sensors, Fiber Bragg gratings, Fiber optics sensors, Astronomical imaging, Digital signal processing, Temperature metrology, Aerospace engineering, Semiconductor lasers, Signal processing, Space telescopes

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We present our work about the development of two complementary interrogation schemes based on fiber optic sensing for the use of structural and thermal monitoring of Ariane launchers. The advantages of fiber optic sensing in particular light-weight, immunity to electromagnetic interferences and the possibility of sensor distribution along optical fibers are driving factors for utilization of this technology in space crafts [1]. The edge-filter (EF) and scanning-laser (SL) interrogators for determination of the mean wavelength of fiber Bragg grating (FBG) sensors have been implemented as two separate demonstrators. Within this paper we describe the functional principles of both interrogators. Furthermore we present test results where the developed systems have been used for readout of FBG sensors which are implemented in an Ariane structural demonstrator during thermal, thermal-vacuum and vibration tests. Functionality of both systems is demonstrated and their potential for further development towards space qualified systems is shown.

Since the performance characteristics of the two systems are different from each other, they are dedicated for different sensing applications on a launcher. The EF sensor interrogator provides a sample rate of 20 kHz at a number of 4 connected sensors and supports parallel readout and aliasing free operation. Therefore it is best suited for high priority measurement. Structural monitoring which requires the acquisition of real time sensor information in order to support control of the launcher is one operation area for a future EF system. The SL interrogator provides an overall measurement rate of 1 kHz at a number of 24 connected sensors distributed on three sensor channels. It can be adapted to any sensors that have design wavelengths lying within the output spectrum of the laser diode. Furthermore the number of overall sensors to be read out with this system can be adapted easily. Thermal mapping of satellite panels is one possible future application for the SL interrogator.

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Proceedings Article | 24 August 2011 Paper

Preliminary results of an experimental verification of shear strain influence on fibre Bragg grating reflection spectra

A. Heßke, M. Müller, T. Buck, A. Koch, F. Jülich, J. Roths

Proceedings Volume 8173, 81731Y (2011) https://doi.org/10.1117/12.897911

KEYWORDS: Fiber Bragg gratings, Polarization, Sensors, Optical filters, Birefringence, Glasses, Refractive index, Polishing, Photonics, Light sources

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Proceedings Article | 18 May 2011 Paper

Nonlinear-programming optimized fiber Bragg grating based force-torque-sensor with six degrees of freedom

Mathias Müller, Lars Hoffmann, Thorbjörn Buck, Rolf Wojtech, Alexander Koch

Proceedings Volume 7753, 77538H (2011) https://doi.org/10.1117/12.886202

KEYWORDS: Fourier transforms, Sensors, Fiber Bragg gratings, Transducers, Structured optical fibers, Condition numbers, Fiber optics sensors, Feedback control, Resistance, Lithium

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Proceedings Article | 18 May 2011 Paper

Fiber Bragg grating interrogator for demonstration of spaceborne applications

Max Rößner, Mathias Müller, Thorbjörn Buck, Alexander Koch

Proceedings Volume 7753, 775377 (2011) https://doi.org/10.1117/12.885941

KEYWORDS: Multiplexing, Sensors, Light sources, Spectroscopy, Imaging systems, Fiber optics, Space operations, Satellites, Fiber optics sensors, Fiber Bragg grating interrogators

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Proceedings Article | 3 June 2010 Paper

Performance of a combined chromatic confocal microscope with thin film reflectometer

Florian Hirth, Thorbjörn Buck, Natasha Steinhausen, Alexander Koch

Proceedings Volume 7729, 77291L (2010) https://doi.org/10.1117/12.853517

KEYWORDS: Colorimetry, Thin films, Confocal microscopy, Head, Reflectometry, Spectroscopy, Reflectivity, Reflection, Light sources, Imaging systems

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Proceedings Article | 17 June 2009 Paper

Measurement errors from internal shear strain within fiber-Bragg-grating sensors

Mathias Müller, Thorbjörn Buck, Hala El-Khozondar, Alexander Koch

Proceedings Volume 7390, 739007 (2009) https://doi.org/10.1117/12.827667

KEYWORDS: Polarization, Fiber Bragg gratings, Sensors, Fiber optics sensors, Dielectric polarization, Polarization maintaining fibers, Birefringence, Radio propagation, Temperature metrology, Reflection

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Proceedings Article | 17 June 2009 Paper

Performance analysis of interrogators for fiber Bragg grating sensors based on arrayed waveguide gratings

Thorbjörn Buck, Mathias Müller, Markus Plattner, Alexander Koch

Proceedings Volume 7389, 738930 (2009) https://doi.org/10.1117/12.827526

KEYWORDS: Fiber Bragg gratings, Sensors, Waveguides, Light sources, Electronics, Optical filters, Resistors, Amplifiers, Refractive index, Photodetectors

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Proceedings Article | 17 June 2009 Paper

Spectral peak tracking for enhanced fiber optic sensing

Markus Plattner, C. Brand, T. Mair, S. Schupfer, T. Buck, A. Koch

Proceedings Volume 7389, 738923 (2009) https://doi.org/10.1117/12.827668

KEYWORDS: Sensors, Digital signal processing, Fiber optics sensors, Fiber Bragg gratings, Detection and tracking algorithms, Semiconductor lasers, Field programmable gate arrays, Tunable lasers, Time metrology, Modulation

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Within this work, we describe our newly developed interrogation scheme for fiber optic sensing applications. This measurement system will be utilized in Ariane launchers for monitoring temperature and mechanical stress distribution during flight. The acquired sensing data can be used to control propulsion unit an thrusters and thereby adapt the flight path in a way that damage on the launcher is prevented. In order to detect the peak wavelength of e.g. fiber Bragg grating (FBG) sensors, a tunable laser source based on a modulated-grating laser diode is able to scan through a more than 40nm wide spectrum in the infrared region. Several sensors with different spectral answers can be placed inside one sensor fiber and then interrogated sequentially. The magnitudes of the reflected intensities depend on the actual sensor position that is determined by the measurand (e.g. temperature). One single sensor is scanned by a variable number of spectral sampling points and the spectral answer of the sensor is then calculated by centroid algorithms. Depending an the spectral width of one sensor, the number of sensors that shall be interrogated and the required sampling points per sensor, a maximum sampling frequency of 240kHz is achievable with our hardware. Contrary to comparable systems, our interrogator is capable of switching to any available wavelength of its spectrum within a couple of nanoseconds. Therefore standard continuous sweeping through the entire spectrum is not necessary. This results in a new measurement scheme, wherein spectral gaps between consecutive sensors do not need to be scanned and can be skipped. Since most of the spectrum consists of the gaps between the sensors, overall measurement time is thereby reduced significantly. One problem arises from this measurement scheme: Due to the fact that the sensor's spectral answers vary in time, a special algorithm for tracking the spectral movement has to be implemented. The scope of this work is the description, implementation and assessment of this new peak tracking procedure. After describing the measurement setup, we will therefore explain the algorithm behind the peak tracking measurement. Afterwards the simulation process is explained and results are shown. Performance obtained by peak tracking compared to standard continuous wavelength scanning is evaluated in detail and further development steps which are necessary to obtain a fully sophisticated interrogation systems are discussed.

Proceedings Article | 17 November 2008 Paper

Realization of a fiber-optic force-torque sensor with six degrees of freedom

M. Müller, L. Hoffmann, T. Buck, A. Koch

Proceedings Volume 7266, 72660S (2008) https://doi.org/10.1117/12.807141

KEYWORDS: Sensors, Fiber Bragg gratings, Fiber optics sensors, Transducers, Fiber optics, Structured optical fibers, Computer aided design, Calibration, Magnetic sensors, Robotic surgery

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