Mr. Mathias S. Müller Profile

Mathias S. Müller

at Technische Univ München

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Author

Publications (16)

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 | 21 November 2017 Open Access

Fiber-optic Sensor Demonstrator (FSD) integration with PROBA-2

Arnd Reutlinger, Markus Glier, Karl-Heinz Zuknik, Lars Hoffmann, Mathias Müller, Stephan Rapp, Charles Kurvin, Thomas Ernst, Iain McKenzie, Nikos Karafolas

Proceedings Volume 10566, 105661B (2017) https://doi.org/10.1117/12.2308187

KEYWORDS: Sensors, Satellites, Fiber optics sensors, Telecommunications, Reflectors, Temperature sensors, Space operations, Sensing systems, Fiber Bragg gratings, Sensor networks

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Proceedings Article | 21 November 2017 Open Access

Fiber optic sensing for telecommunication satellites

Arnd Reutlinger, Markus Glier, Karl-Heinz Zuknik, Lars Hoffmann, Mathias Müller, Stephan Rapp, Charles Kurvin, Thomas Ernst, Iain McKenzie, Nikos Karafolas

Proceedings Volume 10566, 105661C (2017) https://doi.org/10.1117/12.2308215

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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 | 17 February 2011 Paper

Double-cladding-fiber-based detection system for intravascular mapping of fluorescent molecular probes

R. Nika Razansky, Amir Rozental, Mathias Mueller, Nikolaos Deliolanis, Farouc Jaffer, Alexander Koch, Vasilis Ntziachristos

Proceedings Volume 7894, 78940K (2011) https://doi.org/10.1117/12.874653

KEYWORDS: Sensors, Cladding, Luminescence, GRIN lenses, In vivo imaging, Fluorescence spectroscopy, Waveguides, Inflammation, Single mode fibers, Polishing

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Early detection of high-risk coronary atherosclerosis remains an unmet clinical challenge. We have previously demonstrated a near-infrared fluorescence catheter system for two-dimensional intravascular detection of fluorescence molecular probes [1]. In this work we improve the system performance by introducing a novel high resolution sensor. The main challenge of the intravascular sensor is to provide a highly focused spot at an application relevant distance on one hand and a highly efficient collection of emitted light on the other. We suggest employing a double cladding optical fiber (DCF) in combination with focusing optics to provide a sensor with both highly focused excitation light and highly efficient fluorescent light collection. The excitation laser is coupled into the single mode core of DCF and guided through a focusing element and a right angle prism. The resulting side-fired beam exhibits a small spot diameter (50 μm) throughout a distance of up to 2 mm from the sensor. This is the distance of interest for intravascular coronary imaging application, determined by an average human coronary artery diameter. At the blood vessel wall, an activatable fluorescence molecular probe is excited in the diseased lesions. Next light of slightly shifted wavelength emits only in the places of the inflammations, associated with dangerous plaques [2]. The emitted light is collected by the cladding of the DCF, with a large collection angle (NA=0.4). The doublecladding acts as multimodal fiber and guides the collected light to the photo detection elements. The sensor automatically rotates and pulled-back, while each scanned point is mapped according to the amount of detected fluorescent emission. The resulting map of fluorescence activity helps to associate the atherosclerotic plaques with the inflammation process. The presented detection system is a valuable tool in the intravascular plaque detection and can help to differentiate the atherosclerotic plaques based on their biological activity, identify the ones that prone to rupture and therefore require more medical attention.

Proceedings Article | 18 May 2010 Paper

High resolution single-mode-fiber-based sensor for intravascular detection of fluorescent molecular probes

R. Nika Razansky, Mathias Mueller, Alexander Borisov, Alexander Koch, Farouc Jaffer, Vasilis Ntziachristos

Proceedings Volume 7715, 77152K (2010) https://doi.org/10.1117/12.854038

KEYWORDS: Sensors, Single mode fibers, Luminescence, GRIN lenses, Blood vessels, Head, Signal to noise ratio, Gaussian beams, Intravascular ultrasound, Polishing

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Early detection of coronary atherosclerosis is an unmet clinical challenge. The detection system has to be highly sensitive and possess high spacial resolution, in order to provide precise information of the vulnerable plaque location and size. Recently molecular fluorescence probes have been identified as efficient inflammation biomarkers for the inflammation process within vulnerable plaques¹ and being used in the proposed application to detect inflamed lesions in the blood vessel wall. The general principle of the proposed solution is based on a sensor whose head is guided by an intravascular catheter to the region of interest (coronary artery). When the sensor illuminates an activated fluorescent probe, located in inflamed areas of vulnerable plaques, the fluorescence is excited and light is emitted with a slightly shifted spectrum. The emitted light is being collected by the same sensor head, guided through the optical fiber and finally detected by photo-detectors. In this way, by detecting emitted fluorescence one can obtain information about the location of vulnerable plaques. The localization resolution is critically depending on the spot size of the illuminating light beam. Moreover, for a high signal to noise ratio in the detection electronics, as much fluorescent light as possible has to be collected from the plaque location. It has been already demonstrated that using single-mode fibers in combination with graded index fibers, a Gaussian beam, with adjustable waist position and diameter can be formed, representing the fundamental limit of achievable spot size². However, when using single mode fibers in this application, the collection efficiency would be very low due to the small core diameter of this fiber and thus signal to noise ratio would be strongly reduced. In this work, we present a solution to this challenge, combining both principles. A single mode fiber in combination with a graded index fiber is used for illumination purposes, while the fluorescence light is collected by the same fiber, but employing the cladding/coating total reflection to form a multimode fiber for the backwards propagating light. Thus, a narrow spot size can be obtained allowing high resolution images, with high signal to noise ratio due to the multimodal collection scheme. We show preliminary results of spot size and beam diameter measurements from the sensor head and discuss the implication for the improvement of the current catheter-based detection systems.

Proceedings Article | 17 June 2009 Paper

Temperature sensitivity of TE double-negative metamaterial optical sensor

Hala El-Khozondar, Mathias Müller, Rifa El-Khozondar, Mohammed Shabat, Alexander Koch

Proceedings Volume 7390, 73900A (2009) https://doi.org/10.1117/12.827822

KEYWORDS: Sensors, Waveguides, Cladding, Metamaterials, Refractive index, Dielectrics, Light wave propagation, Optical sensors, Dispersion, Radio propagation

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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 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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Proceedings Article | 16 May 2008 Paper

Soldering fiber Bragg grating sensors for strain measurement

Mathias Müller, Lars Hoffmann, Tobias Lautenschlager, Alexander Koch

Proceedings Volume 7004, 70040B (2008) https://doi.org/10.1117/12.786088

KEYWORDS: Sensors, Fiber Bragg gratings, Coating, Adhesives, Copper, Structured optical fibers, Fiber coatings, Metals, Electroplating, Polarization

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Proceedings Article | 16 May 2008 Paper

Fusion of a FBG-based health monitoring system for wind turbines with a fiber-optic lightning detection system

Sebastian Krämer, Benjamin Wiesent, Mathias Müller, Fernando Puente León, Yarú Méndez Hernández

Proceedings Volume 7004, 70040O (2008) https://doi.org/10.1117/12.783602

KEYWORDS: Fiber Bragg gratings, Fiber optics sensors, Sensors, Fiber optics, Magnetic sensors, Magnetism, Multiplexing, Composites, Optical sensors, Wind turbine technology

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Proceedings Article | 18 June 2007 Paper

Performance of a fiber optic ring depolarizer in fiber sensing applications

M. Mueller, L. Hoffmann, A. Koch

Proceedings Volume 6616, 66163I (2007) https://doi.org/10.1117/12.726027

KEYWORDS: Polarization, Sensors, Fiber Bragg gratings, Birefringence, Light sources, Fiber couplers, Fiber optics, Fiber optics sensors, Spectroscopy, Charge-coupled devices

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Proceedings Article | 18 June 2007 Paper

Fiber optic strain measurement for machine monitoring

L. Hoffmann, M. Mueller, A. Koch

Proceedings Volume 6616, 66163A (2007) https://doi.org/10.1117/12.726026

KEYWORDS: Sensors, Fiber Bragg gratings, Fiber optics sensors, Fiber optics, Fiber optics tests, Optical testing, Demodulation, Light sources, Spectroscopy, Temperature metrology

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Showing 5 of 16 publications

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