Generation of sound in a liquid as a result of absorption of modulated laser radiation

Bozhkov, A. I.; Bunkin, F. V.

doi:10.1070/qe1975v005n08abeh011690

Cited by 8 publications

(11 citation statements)

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“…Here, the primed variable is used to represent locations within the source distribution or equivalently the region of optical absorption. To effectively capture the reflected wave off the interface, the Green's Function that enforces the free-surface boundary condition is applied [77]:…”

Section: Appendix Derivation Of Design Equationmentioning

confidence: 99%

An Airborne Sonar System for Underwater Remote Sensing and Imaging

2020

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High-resolution imaging and mapping of the ocean and its floor has been limited to less than 5% of the global waters due to technological barriers. Whereas sonar is the primary contributor to existing underwater imagery, the water-based system is limited in spatial coverage due to its low imaging throughput. On the other hand, aerial synthetic aperture radar systems have provided high-resolution imaging of the entire earth's landscapes but are incapable of deep penetration into water. In this work, we present a proofof-concept system which bridges the gap between electromagnetic imaging in air and sonar imaging in water through the laser-induced photoacoustic effect and high-sensitivity airborne ultrasonic detection. Here, we use air-coupled capacitive micromachined ultrasonic transducers (CMUTs) which is a critical differentiator from previous works and has enabled the acquisition of an underwater image from a fully airborne acoustic imaging system-a task that has yet to be accomplished in the literature. With the entire imaging system located on an airborne platform, there is much promise for the scalability of our system to one which could perform high-throughput imaging of underwater in large-scale deployment. Non-contact acousticbased imaging modalities are also of much interest to the medical imaging and non-destructive testing communities. Incorporating air-coupled transducers, for example CMUTs, or other resonant sensors in these applications could be aided by the analysis presented throughout this work. INDEX TERMS Capacitive micromachined ultrasonic transducer, CMUT, laser doppler vibrometer, laser ultrasound, non-destructive testing, photoacoustic, sonar, ultrasound, underwater imaging This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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Section: Appendix Derivation Of Design Equationmentioning

confidence: 99%

An Airborne Sonar System for Underwater Remote Sensing and Imaging

2020

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“…A possible solution to this problem is to inject radiation into a liquid through a layer of transparent microspheres at the distal end of the fiber, which act as microlenses creating highly concentrated areas of light radiation in the liquid. In the presence of light absorption in the liquid, there arises a system of local heated volumes which leads to an optoacoustic (OA) response due to the thermoelastic effect [10][11][12][13]. From this point of view, the layer of transparent microspheres at the distal tip of the fiber in a light absorbing medium can be considered to be a fiber laser-acoustic converter.…”

Section: Introductionmentioning

confidence: 99%

“…From this point of view, the layer of transparent microspheres at the distal tip of the fiber in a light absorbing medium can be considered to be a fiber laser-acoustic converter. The intensity and frequency characteristics of this converter depend on the properties of the exciting radiation (intensity, time-frequency characteristics), on the properties of the liquid (light absorption coefficient, thermophysical characteristics), as well as on the converter parameters: diameter of the microspheres, index of refraction, and mechanical stability of the system [10][11][12][13]. For local use of the tool, it is reasonable to make such a converter at the output end of a flexible fiber.…”

Section: Introductionmentioning

confidence: 99%

“…This configuration of the experiment allows studying the basic parameters of the system in "primeval" form, avoiding the influence of more complex effects, such as thermal self-defocusing and superheated liquid states. Despite the well studied [10][11][12][13] basic parameters of sound waves excited in a liquid by light, in particular, by laser radiation, the technology for fabricating a converter on a single layer of micron spheres significantly expands the possibilities of exciting high-frequency ultrasound and allows developing new optoacoustic instruments with optical radiation conversion to high-frequency ultrasound with controlled characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The diameter of these LHP structures is 0.5-1 µm. If we assume that the ultrasonic response in this case also corresponds to the "classical" generation mechanism [10][11][12][13], then its maximum response spectrum should be in the frequency band of~(1-5) GHz, which does not correspond to the considered spectral region. Therefore, the results of the coating experiment show that additional studies are required.…”

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confidence: 99%

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The Excitation of Ultrasound by Laser Radiation in Water Using an Optical Fiber Laser Converter with a 2D Colloidal Crystalline Coating

Bredikhin

Казаков

2019

Coatings

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The technology of applying a colloidal single-layer coating of transparent polystyrene (PS) Ø 1 μm spheres at the tip face of a quartz fiber has been proposed and tested. Such a coating plays, in a light absorbing liquid, the role of a converter of pulsed laser radiation into acoustic radiation. The generation of ultrasound in water using a converter based on a quartz fiber 1 mm in diameter with a 2D colloidal crystalline coating consisted of polystyrene spheres with a diameter of ~1 μm at the fiber end was investigated. When excited by laser radiation (λ = 1.064 µm), coating of polystyrene spheres created in the liquid a laser thermal microstructure with a characteristic size of fractions of ~λ and a maximum temperature up to 10−2 degree at an energy in a short laser pulse of ~0.005 J. This short-lived thermal microstructure generated sound pulses in the liquid in the approximately 0.2–4 MHz range. The results of the experimental study of this effect are reported. The proposed laser radiation converter with colloidal coating of the optical fiber distal tip by a single layer of transparent spheres can be used for the development of new laser microtools for studying, processing of various objects in microsurgery, microstructuring of the surface, spot cleaning and restoration of objects of art and history.

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Thermal waves emitted by moving sources and the Doppler effect

Voti

Bertolotti

2021

International Journal of Heat and Mass Transfer

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Generation of sound in a liquid as a result of absorption of modulated laser radiation

Cited by 8 publications

References 1 publication

An Airborne Sonar System for Underwater Remote Sensing and Imaging

An Airborne Sonar System for Underwater Remote Sensing and Imaging

The Excitation of Ultrasound by Laser Radiation in Water Using an Optical Fiber Laser Converter with a 2D Colloidal Crystalline Coating

Thermal waves emitted by moving sources and the Doppler effect

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