Features of the reflection of an acoustic beam from a surface with nonuniform boundary conditions. II. Experiments

Baev, A. R.; Майоров, А. Л.; Asadchaya, M. V.; Konovalov, G. E.

doi:10.1134/s1061830910080024

Cited by 1 publication

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“…As mentioned above, the MF is a kind of nanomaterials with a form varying under the influence of magnetic fields, which has previously been used for both manual control and in some cases -mechanized and automated in ultrasonic flaw detection [8]. On the other hand, as shown [13], MF is a medium with a absorption coefficient, practically close to what is achieved in modern devices based on specially synthesized solid substrates with limited use.…”

Section: Some Directions For Using Magnetic Fluid As An Optoacoustic Convertermentioning

confidence: 86%

“…Magnetic fluids are colloidal solutions possessing aggregative and sedimentary stability relatively magnetic suspended particles under the influence of external fields, including magnetic, electric and others while maintaining fluidity. Earlier it was proposed to use unique properties of MF in a number of acoustic applications including creation of acoustic contact, sound excitation by a variable magnetic field, directional control of acoustic fields and others [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of using MF as an element of OA converter and controlled by the magnetic field of the sound line [8], it is possible to excite in various media acoustic pulses of high intensity and low duration up to ~ 1-10 nS.…”

Section: Introductionmentioning

confidence: 99%

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Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid

Baev¹,

Mit'kovets²,

Asadchaya

et al. 2021

Prib. metody izmer.

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Magnetic fluids belong to the class of nanomaterials with a high gain of light absorption, aggregative and sedimentation stability as well as controllability by external fields, which is of interest to use in the field of optoacoustics. The purpose of the work was to experimentally study the effect of the optoacoustic transformation in a magnetic fluid, depending on the concentration of magnetic colloidal particles, boundary conditions, intensity of the laser as well as to identify the possibilities of using the magnetic fluid as an element of the optoacoustic transformation in a number of applications.A brief analysis of the optoacoustic transformation mechanism in a magnetic fluid was carried out and a technique and an installation that implements the shadow measurement variant developed. A Lotis type laser was used as a source of ultrasonic pulse-laser excitation in magnetic fluids. A quartz and air were used as a material transmitting the energy of laser radiation in a magnetic fluid. Receiving of ultrasound signals was made by a piezoelectric probe at a working frequency of 5 MHz. In the measurement process, the concentration of the dispersed phase in tmagnetic fluid was varied from zero to 8 % and the energy in the impulse – from zero to 10 mJ.For the first time, it was established that: a) an amplitude of the function of the optoacoustic transformation in a magnetic fluid, depending on the concentration of the dispersed phase, has a maximum determined by the fluid physical properties and boundary conditions; b) for all samples within the measurement error, a quasilinear dependence of the specified amplitude of energy in the laser pulse in the range of 0–8 MJ has been established.A number ways of the optoacoustic effects in magnetic fluids to use in ultrasonic testing, measuring the intensity of the laser radiation had been suggested.

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Section: Some Directions For Using Magnetic Fluid As An Optoacoustic Convertermentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid

Baev¹,

Mit'kovets²,

Asadchaya

et al. 2021

Prib. metody izmer.

Self Cite

View full text Add to dashboard Cite

show abstract

Features of the reflection of an acoustic beam from a surface with nonuniform boundary conditions. II. Experiments

Cited by 1 publication

References 1 publication

Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid

Impulsively-Laser Excitation and Propagation of Ultrasonic Waves through Nanomagnetic Fluid

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