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Posted by / 03-Feb-2020 18:34

Ge dating houston

The upper frequency limit in humans (approximately 20 k Hz) is due to limitations of the middle ear.

Auditory sensation can occur if high‐intensity ultrasound is fed directly into the human skull and reaches the cochlea through bone conduction, without passing through the middle ear.

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing.

Ultrasound is no different from 'normal' (audible) sound in its physical properties, except in that humans cannot hear it.

Ultrasound inspection of welded joints has been an alternative to radiography for non-destructive testing since the 1960s.

Lower frequency ultrasound (50–500 k Hz) can also be used to inspect less dense materials such as wood, concrete and cement.

A popular consumer application of ultrasonic ranging was the Polaroid SX-70 camera which included a light-weight transducer system to focus the camera automatically.

Polaroid later licensed this ultrasound technology and it became the basis of a variety of ultrasonic products.

In fluid mechanics, fluid flow can be measured using an ultrasonic flow meter.

Ultrasonic testing is a type of nondestructive testing commonly used to find flaws in materials and to measure the thickness of objects.

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Ultrasound can also provide additional information such as the depth of flaws in a welded joint.

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