High-resolution ultrasonic ultrasound methods: Microstructure visualization and diagnostics of elastic properties of modern materials (Review)

Zakutailov, K. V.; Levin, V. M.; Petronyuk, Yu. S.

doi:10.1134/s0020168510150100

Cited by 32 publications

(15 citation statements)

References 17 publications

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“…9 The bulk visualization is implemented in reflection mode of operation, i.e., the same ultrasonic focusing system is employed to generate a focused probe beam in immersion liquid and to receive echo signals reflected from an object. The application of ultra-short probe pulses provides selection of echo pulses reflected at different depths inside the object by their arrival time.…”

Section: B Impulse Acoustic Microscopymentioning

confidence: 99%

“…The application of ultra-short probe pulses provides selection of echo pulses reflected at different depths inside the object by their arrival time. 9,10 To get acoustical images, a plane-parallel object is placed into an immersion liquid (water) nearby the focal plane of the probe beam. A probe impulse of focused ultrasound partly reflects at the immersion-object interface, partly penetrates into the object and leads to echo pulses from elements of bulk microstructure and from the specimen bottom.…”

Section: B Impulse Acoustic Microscopymentioning

confidence: 99%

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Microstructure, elastic and electromagnetic properties of epoxy-graphite composites

et al. 2015

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A set of epoxy resin-based composites filled with 0.25 – 2.0 wt.% of commercially available exfoliated graphite (EG) and thick graphene (TG), prepared by suspending EG particles in cyclohexane, and submitting the suspension to a series of grinding and ultrasonic dispersion steps, was produced. The microstructure of such epoxy-graphite composites has been studied by the impulse acoustic microscopy technique. According to acoustic microscopy data, exfoliated graphite microparticles have been well dispersed in the epoxy matrix. TG nanoflakes demonstrated persistent tendency to clustering and formation of agglomerates. The addition of graphite particles in small amount (0.25 – 2.0 wt.%) did not influence the bulk elastic properties of epoxy-graphite composite materials. Being extremely lightweight, 0.003 g cm−3, EG had a lower percolation threshold than TG, at the level of 1-1.5 wt.% against 2.1-3.2 wt.%, respectively. As a result, epoxy composites filled with 1.0-2.0 wt.% EG provided high electromagnetic (EM) interference shielding both at microwave and THz frequencies. In contrast, no significant influence of TG loading was observed at low weight fraction (up to 2 wt.%) on the EM performance of epoxy composites.

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Section: B Impulse Acoustic Microscopymentioning

confidence: 99%

Section: B Impulse Acoustic Microscopymentioning

confidence: 99%

Microstructure, elastic and electromagnetic properties of epoxy-graphite composites

et al. 2015

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“…The internal structure of the resulting β Na 0.28 V 2 O 5 crystals opaque in the visible wavelength range was observed on an acoustic microscope using an acoustic lens with the resonant frequency 100 MHz [11]. The structure of the β Na 0.28 V 2 O 5 crystal observed in an acoustic microscope is shown in Fig.…”

Section: Crystal Growth and Study Of Their Microstructurementioning

confidence: 98%

“…The elastic properties of β Na 0.28 V 2 O 5 crystals was were studied using a focused ultrasonic pulse echo technique [11]. A short ultrasonic pulse, representing 40 ns oscillations at a frequency of 50 MHz, was used as a probing signal.…”

Section: Diagnostics Of Elastic Propertiesmentioning

confidence: 99%