# Tag Info

### 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 ...
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### 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

### 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 ...
• 12.4k