Martin Angelmahr

Polymer Optofluidic Chip for Double-Beam Photometric Determination of Nitrite in Water Samples

Vladislav Reimer, Zhenyu Zhang, Christoff Brüdigam, Martin Angelmahr et autres

Abstract We present a compact polymer optofluidic lab-on-a-chip fabricated by maskless laser-direct UV lithography for double-beam photometric detection of nitrite (NO2–) in water. The chip integrates polymer optical waveguides, a 3 dB coupler, and dual microfluidic cells, implementing on-chip measurement and reference …

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Towards probing velocity distributions in dense granular fluids: Utilizing fiber Bragg gratings

Anonymous, Luis Henriques, Fahad Puthalath, Leonardo Facchini et autres

Granular gases are commonly characterized through their velocity distribution, which provides access to the granular temperature. In experiments, velocity distributions are typically obtained by particle tracking, which becomes, however, limited at moderate and high particle densities. As a way forward, we propose …

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Optimized calibration method for fiber optical 3D shape sensors in multicore fibers

Yi Jiang, Yannick Willer, Ahmad Abdalwareth, Günter Flachenecker et autres

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Towards probing velocity distributions in dense granular fluids: Utilizing fiber Bragg gratings

Marlo Kunzner, Luis Henriques, Fahad Puthalath, Leonardo Facchini et autres

Granular gases are commonly characterized through their velocity distribution, which provides access to the granular temperature. In experiments, velocity distributions are typically obtained by particle tracking, which becomes, however, limited at moderate and high particle densities. As a way forward, we propose …

Flexible Sensor Foil Based on Polymer Optical Waveguide for Haptic Assessment

Zhenyu Zhang, Abu Bakar Dawood, Georgios Violakis, Ahmad Abdalwareth et autres

Minimally Invasive Surgery is often limited by the lack of tactile feedback. Indeed, surgeons have traditionally relied heavily on tactile feedback to estimate tissue stiffness - a critical factor in both diagnostics and treatment. With this in mind we present in this …

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Nanoparticle-Coated Optical Hydrogen Sensor for Early Gas Detection of Lithium-Ion Battery Failure

Leonard Kropkowski, Ahmad Abdalwareth, Christoff Brüdigam, Martin Angelmahr et autres

This research investigates the use of a fiber optic sensor for detecting hydrogen gas during a thermal runaway of lithium-ion batteries (LIBs). Timely detection of thermal runaway in LIBs, particularly in storage and logistics, is crucial for effective safety management and preventing …

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In Vivo Study on the Safe Use of a Novel Intraoperative Sensing Tool for Tissue Stiffness Assessment in Endoscopic Surgery

Georgios Violakis, Pantelis Antonakis, Emmanouil Kritsotakis, Theodoros Kozonis et autres

A novel endoscopic palpation tool (EPT), designed for tactile and stiffness sensing using fiber Bragg gratings (FBGs) was evaluated in a surgical environment for intraoperative safety and effectiveness. The EPT consisted of four FBGs arranged in a cross pattern and embedded within …

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Rapid and Accurate Shape-Sensing Method Using a Multi-Core Fiber Bragg Grating-Based Optical Fiber

Georgios Violakis, Nikolaos Vardakis, Zhenyu Zhang, Martin Angelmahr et autres

Shape-sensing optical fibers have become increasingly important in applications requiring flexible navigation, spatial awareness, and deformation monitoring. Fiber Bragg Grating (FBG) sensors inscribed in multi-core optical fibers have been democratized over the years and nowadays offer a compact and robust platform for …

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Fiber Bragg grating-based tactile sensing tool for minimally invasive surgery

Zhenyu Zhang, Georgios Violakis, Abu Bakar Dawood, Ahmad Abdalwareth et autres

A novel miniaturized palpation probe for tactile and stiffness sensing based on fiber Bragg gratings (FBGs) is proposed in this article. The FBGs are inscribed point-by-point with femtosecond laser and integrated on a pneumatic actuated silicone membrane on the tip of the …

Variable Stiffness & Dynamic Force Sensor for Tissue Palpation

Abu Bakar Dawood, Zhenyu Zhang, Martin Angelmahr, Alberto Arezzo et autres

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Variable Stiffness & Dynamic Force Sensor for Tissue Palpation

Abu Bakar Dawood, Zhenyu Zhang, Martin Angelmahr, Alberto Arezzo et autres

Palpation of human tissue during Minimally Invasive Surgery is hampered due to restricted access. In this extended abstract, we present a variable stiffness and dynamic force range sensor that has the potential to address this challenge. The sensor utilises light reflection to …

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Abraded optical fibre-based dynamic range force sensor for tissue palpation

Abu Bakar Dawood, Vamsi Krishna Chavali, Thomas M. Mack, Zhenyu Zhang et autres

Tactile information acquired through palpation plays a crucial role in relation to surface characterisation and tissue differentiation - an essential clinical requirement during surgery. In the case of Minimally Invasive Surgery, access is restricted, and tactile feedback available to surgeons is therefore …

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