Results 11 to 20 of about 336 (99)

Experimental investigation on the cracking process of primary and secondary cracks in thick concrete members

Structural Concrete, Volume 27, Issue 1, Page 514-527, February 2026.
Abstract The decisive reinforcement of thick concrete members is often determined by the minimum reinforcement for crack control due to restraint stresses. In contrast to the heuristic design model in Eurocode 2, a mechanically sound methodology is only provided if the deformation compatibility is considered.
Christina Krenn, Dirk Schlicke
wiley   +1 more source

Single-Fiber Optical Frequency Domain Reflectometry (Ofdr) Shape Sensing of Continuum Manipulators With Planar Bending

2025 IEEE International Conference on Robotics and Automation (ICRA)
To address the challenges associated with shape sensing of continuum manipulators (CMs) using Fiber Bragg Grating (FBG) optical fibers, we feature a unique shape sensing assembly utilizing solely a single Optical Frequency Domain Reflectometry (OFDR) fiber attached to a flat nitinol wire (NiTi). Integrating this easy-to-manufacture unique sensor with a
Mobina Tavangarifard, Wendy Rodriguez Ovalle, Farshid Alambeigi   +2 more
openaire   +2 more sources

Near‐Field Acoustic Imaging Using Fiber‐Optic Distributed Acoustic Sensing and Beamforming Techniques

Advanced Science, Volume 13, Issue 6, 30 January 2026.
This work introduces a beamforming‐based method to generate acoustic images from fiber‐optic distributed acoustic sensing (DAS) data. By performing 2D scanning around the sensing fiber, the approach enables near‐field imaging and localization of acoustic sources, even in regions distant from the fiber. A data‐driven DAS channel selection improves image
Marcelo A. Soto, Diego Badillo‐San‐Juan   +1 more
wiley   +1 more source

A Single-Fiber Optical Frequency Domain Reflectometry (OFDR)-Based Shape Sensing of Concentric Tube Steerable Drilling Robots

CoRR
This paper introduces a novel shape-sensing approach for Concentric Tube Steerable Drilling Robots (CT-SDRs) based on Optical Frequency Domain Reflectometry (OFDR). Unlike traditional FBG-based methods, OFDR enables continuous strain measurement along the entire fiber length with enhanced spatial resolution.
Yash Kulkarni, Mobina Tavangarifard, Daniyal Maroufi, Mohsen Khadem, Justin E. Bird, Jeffrey H. Siewerdsen, Farshid Alambeigi   +6 more
openaire   +2 more sources

Numerical and Experimental Methods for Estimating the Propagation Loss in Microphotonic Waveguides

Advanced Photonics Research, Volume 6, Issue 12, December 2025.
Finite‐element finite‐difference time domain, eigenmode‐expansion, and volume‐current simulations are benchmarked against cut‐back, ring‐resonator, and OFDR measurements to quantify waveguide propagation loss in integrated photonic circuits. Scattering, absorption, leakage, and back‐reflection contributions are dissected; error sources are ranked; and ...
Francesco Dell’Olio, Samuel M. Hörmann, Teresa Natale, Roel Baets, Alexander Bergmann   +4 more
wiley   +1 more source

Optical frequency-domain reflectometry (OFDR) using an integrated fiber tunable filter

, 1999
We present an all-fiber, compact device for optical frequency-domain reflectometry (OFDR). The device combines a Michelson interferometer with a fiber Fabry-Perot tunable filter for rapid wavelength scanning. The free spectral range of the filter is 32 nm and scans may be completed in less than 2.5 ms.
Chen, Z, Zhao, Y, Chen, Z, de Boer, JF, Nelson, JS   +4 more
openaire   +4 more sources

Tightly‐Confined and Long Z‐Cut Lithium Niobate Waveguide with Ultralow‐Loss

Laser &Photonics Reviews, Volume 19, Issue 21, November 6, 2025.
A z‐cut lithium niobate waveguide is demonstrated with ultra‐low loss of 5.8 dB/m in a decimeter‐long LN spiral waveguide. This study is focused on Z‐cut LN waveguides with TE mode to avoid the material birefringence. Utilizing the third order nonlinearity, it is demonstrated that the first all‐normal‐dispersion coherent supercontinuum frequency comb ...
Yan Gao, Yi Sun, Israel Rebolledo‐Salgado, Raphaël Van Laer, Victor Torres‐Company, Jochen Schröder   +5 more
wiley   +1 more source

Structural Color Polymer‐Based Colorimetric Sensor for Detecting Mechanical Stress in Lithium Batteries Separator

Advanced Materials Technologies, Volume 10, Issue 15, August 7, 2025.
A lithium battery separator displaying a structural color allows the visualization of mechanical phenomena in charging and discharging with color changes. The separator consists of silica nanoparticles and an acrylic polymer, enabling the simultaneous observation of the color changes, bubbles, and crystals.
Satoshi Nishita, Hiroaki Onoe
wiley   +1 more source

Deformation monitoring at shield tunnel joints: Laboratory test and discrete element simulation

Deep Underground Science and Engineering, Volume 4, Issue 1, Page 149-157, March 2025.
The optical frequency domain reflectometry technique is applied in laboratory tests to monitor the shear process and center settlement process of shield tunnel segments. Two kinds of quantitative calculation methods are put forward, and the discrete element numerical analysis method is utilized to verify these two methods.
Maoyi Mao, Xiaowei Yang, Chun Liu, Tao Zhao, Hui Liu   +4 more
wiley   +1 more source

Using the inverse finite‐element method to harmonise classical modal analysis with fibre‐optic strain data for robust population‐based structural health monitoring

Strain, Volume 61, Issue 1, February 2025.
Abstract Vibration‐based approaches to structural health monitoring (SHM) gained increasing significance for assessing the behaviour of existing structures because of their non‐intrusive nature and high sensitivity to damage. However, data availability often limits the application of SHM approaches.
Giulia Delo, Rinto Roy, Keith Worden, Cecilia Surace   +3 more
wiley   +1 more source