Questions tagged [ultrasound]

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1answer
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Longitudinal wave propagation in 3D

When a longitudinal wave is sent through a body, there is a strain in the emitted direction (x). What about the three-dimensional body with the strains in the direction perpendicular to the emitting ...
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1answer
28 views

Speed of sound in a solid calculated theoretically

I am trying to find theoretically precise values of the speed of sound in various solid materials. I have found the CRC Handbook of Chemistry and Physics with a table of values with no uncertainties ...
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1answer
16 views

Through-metal-wall Ultrasound sensor imaging?

A while ago, MIT published a paper that used a radar sensor to take a low-res image, and then they trained an AI model to convert the image into a human skeleton for through-wall human pose detection. ...
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1answer
17 views

Intensity of ultrasound emitter

I do an extraction of fir tree needles in water. The endings of branches with needles (4400 pounds) is placed on three levels of net in cylindrical container (6.56 feet diameter, 6.5 feet high). For ...
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1answer
73 views

What is Gor'kov potential?

I'm studying acoustic levitation and have come across this term called "Gor'kov Potential" and did not know what it was. I did a Google search but all I found was research papers loosly ...
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1answer
47 views

Why is there a Nyquist limit in pulsed-wave doppler ultrasound?

The Nyquist limit represents the maximum Doppler shift frequency that can be correctly measured without resulting in aliasing, and always equals the Pulse Repetition Frequency (PRF)$/2$. However why ...
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0answers
15 views

Can I make an ultrasound machine using dust particles of different sizes sticking to paper with static electricity?

If I surrounded an object (to be scanned) with cylinders of paper - each sheet of paper with different sized dust particles sticking to it through static electricity, and then struck the test object ...
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2answers
2k views

Do humans use the doppler effect to localize sources of sound?

Consider a source of sound such as a person speaking or a party of people which makes a continual drone sound of the the same frequency. If a human shakes their head side-to-side with sufficient ...
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2answers
81 views

If the frequency of a sound wave doubles, does its energy quadruple?

Or does it double? What about its 'intensity' or power? Acoustic physics is confusing me more than electromagnetic waves did.... Is there a single list somewhere of the equation(s) relating to sound?
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1answer
16 views

Ultrasonic wave - connection wave speed to amplitude?

An ultrasonic wave is sent through a dispersive medium. That means the waves move at different frequencies with different phase velocities. If this were measured in the frequency spectrum, would the ...
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1answer
37 views

Metal - dispersive media?

Can metal alloys be regarded as "dispersive media" if they are excited with ultrasonic waves?
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2answers
28 views

Wave propagation transverse waves - dispersive or non-dispersive?

Is the propagation of shear waves (transverse waves) in solid media dispersive or non-dispersive? I'm thinking here of ultrasonic waves that propagate in quasi-isotropic material (metal).
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I need help with calculating the intensity of ultrasound

A distance meter, see the picture below, uses ultrasound with a frequency of 50 kHz. The ultrasound is generated by a circular piezoelectric transducer (flat surface that vibrates) with a diameter of ...
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6answers
4k views

How can ultrasound hurt human ears if it is above audible range?

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. Then ultrasound is above 20 kHz Occupational exposure to ultrasound in excess of 120 dB may lead to hearing loss. Source How ...
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17 views

Ultrasonic waves through metals

Might ultrasonic cleaning process/exposure influence or change the acoustic/resonance of a solid silver or solid gold flute? Might ultrasonic cleaning process/exposure weaken or damage parts of that ...
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2answers
75 views

In ultrasound, why doesn't the reflected sound gets reflected again on its way back?

Consider the diagram below illustrating how A-scans work, why doesn't some of the reflected sound on its way back at the red circle interface reflect again (thereby reducing the signal intensity ...
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1answer
26 views

What frequency ranges are best for speakers? [closed]

I have two speakers, one is a 6-inch speaker and another one is Peavy PR 10 (Large speaker). What frequency ranges are best suited for each of the speakers and why?
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How does particle acceleration amplitude relate to particle resonant frequency? (ULTRASOUND)

In diagnostic ultrasound the acoustic pulse propagates in a non-linear fashion (Duck 2002). I have been taught that: The increase in wave velocity in the compressive phase increases particle ...
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3answers
62 views

Why are ultrasound devices using ultrasound? [closed]

I wonder why ultrasound devices are using ultrasound. Is it a biological reason due to our human audible range? Or is there a physical reason for that?
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15 views

Can frequency modulated signals be harnessed for improving the technology of ultrasound cleaning?

I find the problem of response of vapour bubbles to oscillating external pressure field very interesting, as vapour bubbles are highly non-linear systems. To be more specific, the natural radial ...
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1answer
193 views

Does the energy of a sound wave depend on frequency?

The energy of electromagnetic waves is said to be dependent on frequency. Is the energy of a sound wave also dependent on frequency?
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1answer
47 views

Ultrasonic vs x-ray (for medical applications)

What are the differences between using x-rays and ultrasounds for medical diagnosis? From a physical point of view I am aware that x-rays are able to reach deeper into the material - but I think this ...