Instrument - beam former

Question 1

beam former comprised of (8)

Answer 1

1. master sync
2. pulser
3. pulse delays
4. transmit/receive switch
5. amplifiers/ adc (digitizer)
6. echo delays
7. summer/adder

Question 2

gain formula

Answer 2

output power/input power

Question 3

echo delays do what and how

Answer 3

accomplish reception focus/steering, by listening from a certain depth/direction

Question 4

the summer functions according to what parameter

Answer 4

functions according to arrival time using the 13 us/cm rule. If echo arrives at 6.5 us, supper places dot at 0.5 cm. builds the scan line

Question 5

T/R switch function

Answer 5

protects amplifier from large pulse voltage

Question 6

pulse delay main function

Answer 6

decides how many elements/crystals are involved

Question 7

pulse delay is involved in (5)

Answer 7

1. sequencing
2. phasing/steering
3. electronic focusing
4. apodization
5. coded excitation

Question 8

pulser main function

Answer 8

produces electric voltage to drive transducer

Question 9

in 2D, what determines PRF?

Answer 9

depth of image

Question 10

range equation

Answer 10

PRF (max) = 77 000 (cm-s) / depth (cm)

Question 11

converts analog to digital

Answer 11

ADC / digitizer