Moshe Tur
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View article: Optical ranging through turbid underwater media using spatially structured beams
Optical ranging through turbid underwater media using spatially structured beams Open
The use of optics for underwater ranging has gained growing attention because of its potential for higher accuracy over acoustic methods. Typical ranging systems using the temporal/frequency information of light waves, however, may face li…
View article: Optically programable quasi phase matching in four-wave mixing
Optically programable quasi phase matching in four-wave mixing Open
Quasi-phase matching (QPM) enhances nonlinear optical processes by compensating for phase mismatch, but traditional methods require permanent material modifications, limiting applicability in centrosymmetric media like standard optical fib…
View article: Real-Time Damage Detection in an Airplane Wing During Wind Tunnel Testing Under Realistic Flight Conditions
Real-Time Damage Detection in an Airplane Wing During Wind Tunnel Testing Under Realistic Flight Conditions Open
A real-time structural health monitoring (SHM) system of an airplane composite wing with adjustable damage is reported, where testing under realistic flight conditions is carried out in the controllable and repeatable environment of an ind…
View article: Automatic mitigation of dynamic atmospheric turbulence using optical phase conjugation for coherent free-space optical communications
Automatic mitigation of dynamic atmospheric turbulence using optical phase conjugation for coherent free-space optical communications Open
Coherent detection can provide enhanced receiver sensitivity and spectral efficiency in free-space optical (FSO) communications. However, turbulence can cause modal power coupling effects on a Gaussian data beam and significantly degrade t…
View article: Polarization Pulling in Dual-Probe Distributed Brillouin Optical Fiber Sensors
Polarization Pulling in Dual-Probe Distributed Brillouin Optical Fiber Sensors Open
This paper investigates the so-far unexplored influence of the probes on the state of polarization (SOP) of the pump pulse in a distributed fiber sensor based on dual-probe Brillouin optical-time domain analysis (BOTDA). A theoretical fram…
View article: Optically Delaying a Radio Frequency–Linear Frequency-Modulated (RF-LFM) Pulse Using Kerr Comb Carriers and Off-the-Shelf Concatenation of a Linearly Chirped Fiber Bragg Grating and a Chirped-and-Sampled Fiber Bragg Grating
Optically Delaying a Radio Frequency–Linear Frequency-Modulated (RF-LFM) Pulse Using Kerr Comb Carriers and Off-the-Shelf Concatenation of a Linearly Chirped Fiber Bragg Grating and a Chirped-and-Sampled Fiber Bragg Grating Open
We demonstrate a low latency delay of a radio frequency (RF)–linear frequency-modulated (LFM) pulse by modulating it onto optical carriers from a Kerr comb and sending the signal through a concatenation of off-the-shelf linearly chirped fi…
View article: Free-space optical communication link using a single Laguerre-Gaussian beam with tunable radial and azimuthal spatial indices generated by an integrated concentric circular antenna array
Free-space optical communication link using a single Laguerre-Gaussian beam with tunable radial and azimuthal spatial indices generated by an integrated concentric circular antenna array Open
We experimentally demonstrate a 10-Gbit/s free-space communication link using a single Laguerre-Gaussian (LG) beam with tunable radial and azimuthal modal indices generated by a photonic integrated circuit comprising two concentric uniform…
View article: Automatic Mitigation of Dynamic Atmospheric Turbulence Using Optical Phase Conjugation for Coherent Free-Space Optical Communications
Automatic Mitigation of Dynamic Atmospheric Turbulence Using Optical Phase Conjugation for Coherent Free-Space Optical Communications Open
Coherent detection can provide enhanced receiver sensitivity and spectral efficiency in free-space optical (FSO) communications. However, turbulence can cause modal power coupling effects on a Gaussian data beam and significantly degrade t…
View article: Real-Time SHM of composite wing in a wind tunnel test using PCA-Based statistics
Real-Time SHM of composite wing in a wind tunnel test using PCA-Based statistics Open
Structural health monitoring could prove particularly valuable in the case of composite aerostructures, where traditional inspection methods for critical components face challenges due to limited accessibility. An effective online SHM syst…
View article: Temporally and longitudinally tailored dynamic space-time wave packets
Temporally and longitudinally tailored dynamic space-time wave packets Open
In general, space-time wave packets with correlations between transverse spatial fields and temporal frequency spectra can lead to unique spatiotemporal dynamics, thus enabling control of the instantaneous light properties. However, spatio…
View article: Random vibration response-based damage diagnosis for a population of composite aerostructures under varying operating conditions and uncertainty: experimental assessment
Random vibration response-based damage diagnosis for a population of composite aerostructures under varying operating conditions and uncertainty: experimental assessment Open
The problem of random vibration response-based damage diagnosis (detection & type characterization) for a population of 26 composite aerostructures under varying operating conditions and uncertainty is experimentally investigated. Four dam…
View article: An Exploratory Study on Data-Driven Vibration Based Damage Detection and Characterization for a Population of Composite Aerostructures
An Exploratory Study on Data-Driven Vibration Based Damage Detection and Characterization for a Population of Composite Aerostructures Open
This study investigates the effectiveness of four robust to uncertainty data-driven methods of machine learning type for random vibration response-only damage detection and characterization in a population of composite aerostructures under…
View article: All-optical Stern-Gerlach effect in the time domain
All-optical Stern-Gerlach effect in the time domain Open
The Stern-Gerlach experiment, a seminal quantum physics experiment, demonstrated the intriguing phenomenon of particle spin quantization, leading to applications in matter-wave interferometry and weak-value measurements. Over the years, se…
View article: A vibration-based Machine Learning type Structural Health Monitoring methodology for populations of composite aerostructures under uncertainty
A vibration-based Machine Learning type Structural Health Monitoring methodology for populations of composite aerostructures under uncertainty Open
A robust to uncertainty Machine Learning (ML) based Structural Health Monitoring methodology for populations of composite aerostructures is postulated. The methodology is founded upon a number of unsupervised ML algorithms for damage detec…
View article: Development and experimental validation of a prototype system for Machine Learning based SHM in composite aerostructures
Development and experimental validation of a prototype system for Machine Learning based SHM in composite aerostructures Open
The development and experimental validation of a Machine Learning (ML) vibration based Structural Health Monitoring (SHM) prototype system for composite aerostructures operating under uncertainty is presented. Following initial training, i…
View article: Space–time wave packets with reduced divergence and tunable group velocity generated in free space after multi-mode fiber propagation
Space–time wave packets with reduced divergence and tunable group velocity generated in free space after multi-mode fiber propagation Open
Previously, space–time wave packets (STWPs) have been generated in free space with reduced diffraction and a tunable group velocity by combining multiple frequency comb lines each carrying a single Bessel mode with a unique wave number. It…
View article: Temporally and Longitudinally Tailored Dynamic Space-Time Wave Packets
Temporally and Longitudinally Tailored Dynamic Space-Time Wave Packets Open
In general, space-time wave packets with correlations between transverse spatial fields and temporal frequency spectra can lead to unique spatiotemporal dynamics, thus enabling control of the instantaneous light properties. However, spatio…
View article: Laboratory Results of a Real-Time SHM Integrated System on a P180 Full-Scale Wing-Box Section
Laboratory Results of a Real-Time SHM Integrated System on a P180 Full-Scale Wing-Box Section Open
The final objective of the study herein reported is the preliminary evaluation of the capability of an original, real-time SHM system applied to a full-scale wing-box section as a significant aircraft component, during an experimental camp…
View article: DYNAMIC STRAIN VERSUS ACCELERATION BASED ROBUST STRUCTURAL HEALTH MONITORING FOR A POPULATION OF COMPOSITE AEROSTRUCTURES UNDER UNCERTAINTY
DYNAMIC STRAIN VERSUS ACCELERATION BASED ROBUST STRUCTURAL HEALTH MONITORING FOR A POPULATION OF COMPOSITE AEROSTRUCTURES UNDER UNCERTAINTY Open
The study explores the use of dynamic strain signals for Structural Health Monitoring (SHM) in a population of composite aerostructures under uncertainty.Both delamination and debonding type damage, of two minor levels and occurring at two…
View article: Preliminary Results of a Structural Health Monitoring System Application for Real-Time Debonding Detection on a Full-Scale Composite Spar
Preliminary Results of a Structural Health Monitoring System Application for Real-Time Debonding Detection on a Full-Scale Composite Spar Open
The present paper reports the outcomes of activities concerning a real-time SHM system for debonding flaw detection based on ground testing of an aircraft structural component as a basis for condition-based maintenance. In this application…
View article: DYNAMIC STRAIN VERSUS ACCELERATION BASED ROBUST STRUCTURAL HEALTH MONITORING FOR A GROUP OF COMPOSITE AEROSTRUCTURES: EXPERIMENTAL ASSESSMENT
DYNAMIC STRAIN VERSUS ACCELERATION BASED ROBUST STRUCTURAL HEALTH MONITORING FOR A GROUP OF COMPOSITE AEROSTRUCTURES: EXPERIMENTAL ASSESSMENT Open
The problem of population-based Structural Health Monitoring for composite aerostructures via dynamic strain signals is experimentally investigated under high levels of population, experimental, and temperature uncertainty.Both delaminatio…
View article: High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region
High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region Open
Due to its absorption properties in atmosphere, the mid-infrared (mid-IR) region has gained interest for its potential to provide high data capacity in free-space optical (FSO) communications. Here, we experimentally demonstrate wavelength…
View article: Generation of OAM-carrying space-time wave packets with time-dependent beam radii using a coherent combination of multiple LG modes on multiple frequencies
Generation of OAM-carrying space-time wave packets with time-dependent beam radii using a coherent combination of multiple LG modes on multiple frequencies Open
Space-time (ST) wave packets, in which spatial and temporal characteristics are coupled, have gained attention due to their unique propagation characteristics, such as propagation invariance and tunable group velocity in addition to their …
View article: High capacity terahertz communication systems based on multiple orbital-angular-momentum beams
High capacity terahertz communication systems based on multiple orbital-angular-momentum beams Open
Structured electromagnetic waves carrying orbital angular momentum (OAM) have been explored in various frequency regimes to enhance the data capacity of communication systems by multiplexing multiple co-propagating orthogonal OAM beams (i.…
View article: Tunability of space-time wave packet carrying tunable and dynamically changing OAM value
Tunability of space-time wave packet carrying tunable and dynamically changing OAM value Open
Space-time (ST) wave packets have gained much interest due to their dynamic optical properties. Such wave packets can be generated by synthesizing frequency comb lines, each having multiple complex-weighted spatial modes, to carry dynamica…
View article: Experimental demonstration of dynamic spatiotemporal structured beams that simultaneously exhibit two orbital angular momenta by combining multiple frequency lines, each carrying multiple Laguerre–Gaussian modes
Experimental demonstration of dynamic spatiotemporal structured beams that simultaneously exhibit two orbital angular momenta by combining multiple frequency lines, each carrying multiple Laguerre–Gaussian modes Open
In general, there are different, relatively independent forms of orbital angular momenta at a given propagation distance, which might exhibit different dynamic spatial characteristics. One type involves a beam with a helical phasefront tha…