Chapter 4

Question 1

5 Parameters

Answer 1

• Pulse Duration
• Spatial Pulse Length
• Pulse Repetition Period
• Pulse Repetition Frequency
• Duty Factor

Question 2

Continuous waves can make images. true or false

Answer 2

false they cannot create images

Question 3

Define Pulse Duration

Answer 3

TIME from start to end of pulse, “talking” “on” time

Question 4

Pulse Duration typical values

Answer 4

0.5-0.3 microseconds

Question 5

Pulse Duration
Determined by:
Adjustable:

Answer 5

Sound source
no not adjustable

Question 6

Define Spatial Pulse Length

Answer 6

Distance of pulse occupies from start to end, (wavelength kinda)

Question 7

Spatial Pulse Length typical values

Answer 7

0.1-1.0 mm

Question 8

Spatial Pulse Length
Determined by:
Adjustable:

Answer 8

Source AND Medium
Not adjustable

Question 9

Define Pulse Repetition Period

Answer 9

time from start of one pulse to the next , (one talking and one listening time)

Question 10

Pulse Repetition Period typical values

Answer 10

100 microseconds (us) to 1 millsecond (ms)

Question 11

Pulse Repetition Period
Determined by:
Adjustable:

Answer 11

Source
YES it is adjustable (DEPTH BUTTON)
directly related to depth

Question 12

Define Pulse Repetition Frequency

Answer 12

Number of pulses transmitted into the body each second, (not cycles)

Question 13

Pulse Repetition Frequency typical Values

Answer 13

1,000 - 10,000 hertz (pulses per second)

Question 14

Pulse Repetition Frequency
Determined by:
Adjustable:

Answer 14

Source
YES it is adjustable (DEPTH BUTTON) inversely related to depth

Question 15

Define Duty factor

Answer 15

Percentage or fraction of time system transmits pulse

Question 16

Duty Factor typical values

Answer 16

0.002 - 0.005 / 0.2% - 0.5%
99.8% system is RECIEVING
1.0 / 100% for continuous waves

Question 17

Duty Factor
Determined by:
adjustable:

Answer 17

Source
YES it is adjustable (DEPTH)
inversely related to depth