Explanipedia

Optically programable quasi phase matching in four-wave mixing Open

Gil Bashan, Avishay Eyal, Moshe Tur, Ady Arie · 2025

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…

All-optical Stern-Gerlach effect in the time domain Open

Gil Bashan, Avishay Eyal, Moshe Tur, Ady Arie · 2024

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…

Unravelling Coexistence of Superparamagnetism- Soft Ferrimagnetism, Super-Spin Glass and Griffith Phases in an Assembly of Greenly Synthesized Zn0.5fe2.5o4 Nanopolygons and Their Magnetic Hyperthermia Efficiency Open

Sudeep Tiwari, Anita Yadav, Saeed Kamali, Aleia Williams, J. Shebha Anandhi , et al. · 2024

Compensation of phase-noise in pulse-compression phase-sensitive OTDR sensors Open

Enrique Piñeiro, Mikel Sagues, Avishay Eyal, Alayn Loayssa · 2022

We introduce a technique to compensate the performance impairments due to the laser phase noise in long-range pulse-compression DAS sensors. Experiments demonstrate the use of the longest duration pulse compression waveform to date.

Quasi-distributed fiber sensing via perfect periodic Legendre codes Open

Nadav Arbel, Lihi Shiloh, Nadav Levanon, Avishay Eyal · 2021

Long-range Rayleigh-based Distributed Acoustic Sensing (DAS) systems are often limited in their sensitivity and bandwidth. The former limitation is a result of the low backscat- tered power and poor dynamic-strain to optical-phase transduc…

Two-wavelength phase-sensitive OTDR sensor using perfect periodic correlation codes for measurement range enhancement, noise reduction and fading compensation Open

Mikel Sagues, Enrique Piñeiro, Enis Cerri, Aldo Minardo, Avishay Eyal , et al. · 2020

We demonstrate a two-wavelength differential-phase-measuring OTDR sensor that uses perfect periodic correlation phase codes to enhance the measurement performance. The two-wavelength technique extends the measurement range of OTDR sensors …

Sparse recovery methodologies for quasi-distributed dynamic strain sensing Open

Lihi Shiloh, Roy Shen-Tzur, Avishay Eyal, Raja Giryes · 2020

Quasi-distributed measurement of strain and/or temperature is often implemented using arrays of weakly reflecting fiber Bragg gratings (FBGs) whose reflection peaks are centered at the same nominal wavelength. The signals are obtained by m…

Distributed Dynamic Strain Sensing via Perfect Periodic Coherent Codes and a Polarization Diversity Receiver Open

Juan José Mompó, Lihi Shiloh, Nadav Arbel, Nadav Levanon, Alayn Loayssa , et al. · 2019

Rayleigh scattering-based dynamic strain sensing with high spatial resolution, fast update rate, and high sensitivity is highly desired for applications such as structural health monitoring and shape sensing. A key issue in dynamic strain …

Use of distributed acoustic sensing for Doppler tracking of moving sources Open

Nina Shpalensky, Lihi Shiloh, Haniel Gabai, Avishay Eyal · 2018

Distributed acoustic sensing (DAS) via fiber-optic reflectometry techniques is finding more and more applications in recent years. In many of these applications, the position of detected acoustic or seismic sources is defined with a single…

Deep Learning Approach for Processing Fiber-Optic DAS Seismic Data Open

Lihi Shiloh, Avishay Eyal, Raja Giryes · 2018

Developing automatic algorithmic tools for targets' detection and classification in a fiber-optic Distributed Acoustic Sensing (DAS) system is a challenging task. The main hurdle is the need to produce a large-scale dataset of tagged event…

Sinusoidal frequency scan OFDR with fast processing algorithm for distributed acoustic sensing Open

Lihi Shiloh, Avishay Eyal · 2017

Recently it was shown that sinusoidal frequency scan optical frequency domain reflectometry (SFS-OFDR) can achieve remarkable performance in applications of distributed acoustic sensing (DAS). The main advantage of SFS-OFDR is the simplici…

High resolution DAS via sinusoidal frequency scan OFDR (SFS-OFDR) Open

Eyal Leviatan, Avishay Eyal · 2015

There are many advantages to using direct frequency modulation for OFDR based DAS. However, achieving sufficiently linear scan via direct frequency modulation is challenging and poses limits on the scan parameters. A novel method for analy…

Multiplexing of fiber-optic ultrasound sensors via swept frequency interferometry Open

Haniel Gabai, Idan Steinberg, Avishay Eyal · 2015

The use of fiber-optic sensors for ultrasound (US) detection has many advantages over conventional piezoelectric detectors. However, the issue of multiplexing remains a major challenge. Here, a novel approach for multiplexing fiber-optic b…

Distributed acoustic and vibration sensing via optical fractional Fourier transform reflectometry Open

Lihi Shiloh, Avishay Eyal · 2015

Distributed acoustic sensing has been traditionally implemented using optical reflectometry. Here we describe an alternative to the common interrogation approaches. According to the new method the frequency of the source is varied sinusoid…

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