PZT, Bandwidth, Q Factor, Frequency

Question 1

Curie temperature

Answer 1

365 C or 680 F

Question 2

A PZT heated past Curie point will be?

Answer 2

depolarized

Question 3

Sterilization

Answer 3

complete destruction of all living microorganisms by heat, chemical agents, or radiation

Question 4

Disinfection

Answer 4

reduce or eliminate infectious organisms

Question 5

The active element is equal to ____ the wavelength

Answer 5

half

Question 6

The matching layer has an impedence between the impedences of?

Answer 6

PZT and skin

Question 7

What is the purpose of the matching layer?

Answer 7

Reduce reflection; increase transmission

Question 8

The matching layer is equal to _____ the wavelength

Answer 8

1/4

Question 9

Order of impedences in decreasing order

Answer 9

PZT > matching layer > gel > skin

Question 10

______ pulses create better images

Answer 10

Short

Question 11

Bandwidth

Answer 11

Range of frequencies between highest and lowest

Question 12

Imaging transducers have a ____ bandwidth

Answer 12

wide

Question 13

Imaging transducers have a _____ Q factor

Answer 13

low

Question 14

Equation for Q factor

Answer 14

operating frequency/bandwidth

Question 15

The main frequency is determined by?

Answer 15

thickness of the PZT and speed of sound in the PZT

Question 16

Equation for operating frequency

Answer 16

prop speed/2xthickness

Question 17

Thickness of the PZT and frequency are _______ related

Answer 17

inversely

Question 18

Prop speed of the PZT and frequency are ______ related

Answer 18

directly