Week 1 - US Production

Question 1

what is piezo-electric effect

Answer 1

mechanical force causes object to become electrically polarized

Question 2

what is reverse piezo-electric effect

Answer 2

voltage across crystal causes deformation based on polarity of voltage

Question 3

The nature of crystal output is determined by __

Answer 3

type of voltage waveform applied and its magnitude

Question 4

how to calculate piezoelectric material thickness

Answer 4

L = c/2f

Question 5

transducer frequency dependent on __

Answer 5

crystal thickness

Question 6

the distance between transducer and an interface
is __

Answer 6

2s = ct

Question 7

transducers can act as both __

Answer 7

transducer & receiver

Question 8

crystal source acts as both __

Answer 8

sound source & sound receiver

Question 9

crystals have Electrodes which act as electrical connections to

Answer 9

carry electrical impulses to crystal and back during echo reception

Question 10

crystal thickness dependent on __

Answer 10

output frequency

Question 11

in damping, short pulses are used to allow for __

Answer 11

better resolution

Question 12

acoustic insulator function is to __

Answer 12

prevents transmission of sound to the
casing and reverberations within the probe

Question 13

matching layer function is to __

Answer 13

overcome the problem of
impedance mismatch

Question 14

bandwidth is the __

Answer 14

range of frequency
content measured at the half amplitude
level of the frequency spectrum

Question 15

advantages of broadband transducer over narrowband

Answer 15

cost saving & allows rapid frequency switching