5 votes

Can ultrasonic sound pass through solid medium?

Ultrasound partially reflects when it encounters a medium with different acoustic impedance. It behaves like light and obeys Fresnel equations. If the angle of incidence is smaller than the total ...
  • 1,045
2 votes

small relatively inexpensive crack detection apparatus for bike shops

There are three dye-pene types. The cheapest one is likely good enough ;1- A dye is applied ( usually red), 2- allow to soak ,3 - clean off surface dye( May use a cleaner for this ), 4- spray on a ...
  • 5,932
2 votes

small relatively inexpensive crack detection apparatus for bike shops

Solar Mike is exactly right, the method he cites is called dye penetrant and it works for ferrous metals, aluminum alloys, and composites as well. all you need is a bottle of the fluorescent dye, the ...
2 votes

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

Ultra sound sensors could be used, you know the general size of all available container sizes and the material it is made of create a lookup table for such empty containers returning sounds. sound ...
1 vote

small relatively inexpensive crack detection apparatus for bike shops

Eddy current analysis, we paid $17k per unit, but they're for manufacturing lines. I'm not sure how much a smaller hand-held unit with a stylus-type probe is. We buy our equipment from Magnetic ...
1 vote

Can I use a water-based ultrasound-cleaner with oil?

In my lab we use ultrasound cleaners a lot, albeit to clean glassware but from all sorts of stains and dirt. What I would suggest at first is that you try water + dishwashing liquid. Dishwashing ...
1 vote

High frequency ultrasound effects on viruses and bacteria

Since this question is addressed around COVID-19, which is trending these days this response is focused on COVID-19 and using electronics to destroy the virus. The response is focused around ...
1 vote

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

For multiple "spots" on a road, train an overhead, high-speed (maybe), sensitive, thermal imaging camera on the road. All else being equal, higher pressure from a vehicle passing over a &...
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1 vote

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

Measure the deflection of the suspension springs in the trailer. The greater the load, the lower the trailer will sit. You prepare a calibration chart using known weights loaded on a given brand of ...
1 vote

Is there a difference between piezo ceramic disc transducer and a piezo ceramic bender

So, the difference between both is their working and the mode of excitation. the bender piezo shall be loaded in cantilever (better for application with higher loads) less accuracy. While the disk ...
  • 11
1 vote

Measuring intensity of a radio wave reflected from a metal plate

Typical distance sensors depend on time-of-flight. If you're trying to hack the distance from return power level, you will not be happy (to put it mildly). It's next to impossible to calibrate any ...
1 vote

Is it possible to calculate the shear wave velocity in lab using ultrasonic test?

Well, nothing is impossible. But, lets see what you are trying to do: This diagram is simplified; in reality, there are 3 different P (compression) waves and 2 different S (shear) waves. ...
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1 vote

What materials that can contain water and ultrasound wave can go through

Any common lab materials will do if all you need is for the ultrasound waves to pass through them, like glass or aluminum plate. More importantly is that the material must not porous and have a good ...
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1 vote

What materials that can contain water and ultrasound wave can go through

Since ultrasound is often used for medical purposes on humans and animals, I would think that ballistic gelatin could be used for this experiment. It supposedly has the same density as muscle tissue, ...
  • 165
1 vote

What is the best resolution obtainable by ultrasonic non destructive testing?

The resolution depends on the material you are using and the frequency $f$ applied. An approximation for the resolution is given by half of the wavelength $$\lambda = \frac{c}{f}.$$ The sonic speed $...
  • 1,046

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