ch 8 physics 1 transducers

Relationship between prop speed and frequency

Directly related

Relationship between frequency and thickness

Inversely related

Quality Factor

 What is the equation?

A unitless number representing the extent of damping.

 

 

QF = main frequency/bandwidth

Relationship between q-factor and bandwidth

Inversely related.

Reverse piezoelectric effect

Voltage → sound

Piezoelectric effect occurs during

Reception

Reverse piezoelectric effect occurs during

Transmission

PZT manmade material has

A high impedance (high resistance to sound)

The temperature at which is PZT is polarized

The Curie Temperature or Point

 

~360°C or 680°F

Frequency and element thickness relationship

Inversely related

Thinner elements create

Higher frequencies with shorter wavelengths

Thicker elements create

Lower frequencies with longer wavelengths

Slow prop speed ( low numerical value)

Lower frequencies

Fast prop speeds (high numerical value) create

Higher frequencies

Piezoelectric materials are also called

Ferroelectric material

Typical elements are now thick?

0.2 - 1 mm

Higher frequency probes have thin or thick PE elements?

Thin

Matching layer is usually made of

Plastic

Inversely related