Opto-acoustic behavior of coated fiber Bragg gratings . Massimo Moccia, 1. Marco Pisco, 1. Antonello Cutolo, 1. Vincenzo Galdi, 2. Pierantonio Bevilacqua, 3

av M Blomqvist · 2005 · Citerat av 7 — Optical waveguiding in magnetron-sputtered Na0.5K0.5NbO3 thin films on sap- since it allows for the interaction of acoustic and optic waves and makes

Light reflected from a mirror or equivalent oscillating in accordance to received acoustic signals is transmitted via fiber optics to a sonobuoy for further transmission. Keywords: Polymer Optical Fibre Sensors , Fibre Sensors , Polymer Optical Fibre , Endoscopy , Biomedical Applications , Opto-Acoustic Imaging. 1. INTRODUCTION .

An ultrasonic probe was developed by using, in conjunction, optoacoustic and acousto-optic devices based on fiber optic technology. The intrinsic high frequency and wide bandwidth associated both to the opto-acoustic source and to the acousto-optic receiving element could open a way towards a “virtual biopsy” of biological tissue. 2016-04-17 · Opto-Acoustic Imaging • Optical energy from a laser is absorbed. 2,3,4 • Light excitation causes thermalelastic expansion within a mass which then emits a pressure (acoustic) wave that is detected by an array of acoustic sensors within a hand-held breast probe. 5 • Pulses of laser light at two wavelengths are applied sequentially to Opto-acoustic phenomena in whispering gallery mode resonators Guoping Lin and Yanne K. Chembo Optics Department, FEMTO-ST Institute, Besançon, France ABSTRACT Optical whispering gallery mode resonators are important platforms to enhance and study various nonlinear frequency conversion processes. A new Micro-Opto-Mechanical System (MOMS) technology for the fabrication of optoacoustic probes on optical fiber is presented. The technology is based on the thermoelastic emission of ultrasonic waves from patterned carbon films for generation and on extrinsic polymer Fabry-Perot acousto-optical transducers for detection, both fabricated on miniaturized single-crystal silicon frames used to “By combining opto-acoustic imaging and traditional ultrasonic imaging in such a novel manner, the system can employ just one ultrasonic transducer to detect all three ultrasound pulses and use the same set of analog and digital electronics to acquire and process both types of signals,” he said.

The intrinsic high frequency and wide bandwidth associated both to the opto-acoustic source and to the interferometric acousto-optic element could open a way towards a “virtual biopsy”.

An opto-acoustic hydrophone converting acoustic signals to corresponding modulated optical signals and transmitting the converted signals via a fiber optics cable to a sonobuoy. Light reflected from a mirror or equivalent oscillating in accordance to received acoustic signals is transmitted via fiber optics to a sonobuoy for further transmission.

1985-03-01 results have demonstrated the capabilities of opto-acoustic antenna based on fiber Bragg gratings. It can get a fiber optic hydrophone with the same pe rformances of the PZT traditionally Fiber opto-acoustic feedback in systems based on pulsed lasers. April 1997; Proceedings of SPIE - The International Society for Optical Engineering Opto-acoustic Coupling and Brillouin Phenomena in Microstructure Optical FibersHervé Maillotte (1) , Jean-Charles Beugnot (1) , Birgit Stiller (1) , Min Won Lee (1) , Duc Minh Nguyen (1) , Michael Delqué (1) , Sarah Benchabane (2) , Vincent Laude (2) , Stella Foaleng Mafang (3) , Luc Thévenaz (3) , Géraud Bouwmans (4) , Alexandre Kudlinski (4) , Gilles Mélin (5) , Jérôme Hauden (6 The opto-acoustic generator of ultrasound waves comprises an optical fiber associated to a laser-energy source, and an opto-acoustic transducer which is applied to said fiber and is designed to be The opto-acoustic generator of ultrasound waves comprises an optical fiber associated to a laser-energy source, and an opto-acoustic transducer which is applied to said fiber and is designed to be 1997-04-01 Optoacoustics is the world leader in innovative, high performance optical sound and vibration solutions for medical, industrial and environmental applications - FOMRI III™+ Like photonic crystals have revolutionized the way of manipulating optical waves at the sub-micron scale, phononic crystals have more recently played similar decisive role for sound waves, or more generally elastic waves. Then, the idea of coupling light and sound in purposely designed microstructures is now emerging.

The fiber optic acoustic sensors, which are operated in interferometric techniques [7] and fiber grating techniques [8], can be applied to separately quantify the power density and the frequency

The intrinsic high frequency and wide bandwidth associated both Optoacoustics is the world leader in innovative, high performance optical sound and vibration solutions for medical, industrial and environmental applications - FOMRI III™+ Figure 1: Schematic setup of a non-resonant acousto-optic modulator.

Optics Express, 2011. Massimo Moccia In this paper, we present the study of the acousto-optic behavior of underwater-acoustic sensors constituted by fiber Bragg gratings (FBGs) coated by ring-shaped overlays. Via full-wave numerical simulations, we study the complex opto-acousto-mechanical interaction among an incident acoustic wave traveling in water, the optical fiber surrounded by the ring shaped coating, and the FBG inscribed An acousto-optic modulator, also called a Bragg cell or an acousto-optic deflector, uses the acousto-optic effect to diffract and shift the frequency of light using sound waves. They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control. A piezoelectric transducer is attached to a material such as glass. An oscillating electric signal drives … More specifically, we study the complex opto-acousto-mechanical interaction among an incident acoustic wave traveling in water, the optical fiber surrounded by the ring-shaped coating, and the FBG inscribed in the fiber, via full-wave numerical simulations by means of a multiphysics software package based on the finite-element method (FEM).
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V.V.Tuchin. Lasers and fiber optics in biomedical investigations // Saratov: Saratov Univ. Publishing, 1998, 384 p … Acoustic impedance sensing based on forward stimulated Brillouin scattering (FSBS) in fiber has attracted the attention of researchers in recent years. Here, we propose a novel, to the best of our knowledge, multipoint sensing scheme based on FSBS, which explores frequency-division multiplexing. Since the resonance center frequencies of the FSBS-invoked acoustic modes are dependent on the Combining opto-acoustic imaging with conventional ultrasound techniques allows radiologists to more accurately classify breast tumors.

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Via full- -wave numerical simulations, we study the complex opto-acousto-mechanical interaction among an incident acoustic wave traveling in water, the optical fiber surrounded by the ring shaped coating, and the FBG inscribed the fiber, focusing on the frequency range 0.5-30 kHz of interest for SONAR applications.

Copy to clipboard. Fiber delivered laser pulses emulsify thrombus by mechanical stresses that … Figure 1: Schematic setup of a non-resonant acousto-optic modulator. A transducer generates a sound wave, at which a light beam is partially diffracted. The diffraction angle is exaggerated; it is normally only of the order of 1°.

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av A Hejll — omfattar även mätsensorer, t ex töjningsgivare, fiberoptiska sensorer för Rippert, L. Wevers M. Van Huffel S. (2000): Optical and acoustic damage detection in

In the present pa- per, a miniaturized ultrasonic transducer entirely based on fiber optic technology is proposed.