University Of Ultrasonics Week 1

Front 1

Elements that are pulsed in groups with pre-calculated time delays for each element

Back 1

Phased Array (Uses multi-element (array) probes for increased beam, steering, and focusing.

Front 2

What are the two basic types of Beams?

Back 2

1. Linear/ Electronic

2. Sectorial/ Azimuthal

Front 3

What beam type has multiple sound beams created at the same refracted angle?

Back 3

Linear/ Electronic

Front 4

Most Phased Array inspections are done how?

Back 4

Unfocused

Front 5

What beam type creates sound beams through a range of angles by changing the time delay between each of them?

Back 5

Sectorial/ Azimuthal

Front 6

The OmniScan collects 10-bit data but is only able to display what amount?

Back 6

8-bit data

Front 7

Raising the points Qty. will better or worsen the on screen resolution? (160/ 320/ 640)

Back 7

Better

Front 8

What is VPA?

Back 8

Virtual Probe Aperature

# of elements x pitch

Front 9

5L16-9.6x10-A1-P-2.5-OM, has what mHz frequency?

Back 9

5 MHz

Front 10

SA1-N55S-IHC-AOD8, has what refracted angle?

Back 10

55' in mild steel.

Front 11

What is Snells law used to find?

Sin0 = Vi

Sin0 = Vr

Back 11

the refracted angle of a sound beam

Front 12

What are the programmed pattern of times delays applied to pulsing and receiving from the individual elements of an array probe in order to steer and/ or focus the resulting sound beam and echo response?

Back 12

Focal Laws

Front 13

What Linear array is used in class and the most commonly used?

Back 13

1D Linear Array

Front 14

Is Beam formation caused by Constructive or Destructive Interferences?

Back 14

Constructive (they match each other and create larger wave) compliment one another

Front 15

Is sensitivity increased or decreased by the addition of more elements?

Back 15

Increased with increased energy and the greater the depth of coverage.

Front 16

'Dampening' is done to improve what?

Back 16

Resolution, stopping the crystals from ringing at a specific time.

Front 17

Where does focusing and beam steering occur?

Back 17

Near Field

Front 18

By increasing the number of elements what do you do to 'resolution'?

Back 18

Improve, Narrow beamse equate to better resolution.

Front 19

Aperature refers to what?

Back 19

The amount of elements used

Front 20

By altering the time delays of the probe you can successfully do what

Back 20

Beam steering

Front 21

The smaller the element sizes and pitches, makes it easier/ harder to beam steer?

Back 21

Easier

Front 22

By using the probe outside of its limits what can appear on the screen?

Back 22

'Grating Lobes', which could give off false indications or mask smaller ones

Front 23

If you reduce pitch and element size, are Grading Lobes increase or decrease?

Back 23

Decrease

Front 24

Concentrating the sound to a point by converging acoustic energy onto a small focal spot is...

Back 24

Beam Focusing

Front 25

Using more elements to create the beams creates a smaller/ tighter...

Back 25

Focal point

Front 26

By combining Beam Steering and Beam Focusing you can create a ' ' focus

Back 26

Angled

Front 27

How do you calculate the Number of Laws (VPA's)

Back 27

Total elements- Aperature size+ 1

Front 28

Which two calibrations should be performed prior to daily use at a minimum.

Back 28

1) Wedge Delay

2) Sensitivity

Front 29

What is the angle tolerance on a Beam Angle Verification?

Back 29

+/- 2'

Front 30

On the machine what is color directly linked to

Back 30

Amplitude return

Front 31

What axis does the A-Scan consist of?

Back 31

Ultrasound axis vs. Amplitude axis

Front 32

What axis does the B-Scan consist of?

Back 32

Ultrasound axis vs. scan axis

Front 33

What axis does the S-Scan consist of?

Back 33

Ultrasound axis vs. index axis

Front 34

What axis does the C-Scan (0' or linear angle) consist of?

Back 34

Index axis vs. scan axis

Front 35

What axis does the C-Scan (S-Scan) consist of?

Back 35

Focal Law vs. Scan axis

Front 36

The primary use of which scan in weld inspection is the length sizing and verifying scan quality

Back 36

C-Scan

Front 37

Manual scanning applicatinos are mostly restricted to which scans?

Back 37

A and S scan imaging views

Front 38

Shear wave 'evaluation' should be performed using this display layout?

Back 38

A-Scan S-scan and B-scan

Front 39

This scan represents ultrasonic data down the entire scan axis for 'one' focal law or A-Scan only?

Back 39

B-Scan

Front 40

270'

0' 180'

90'

Does 90' represent Upstream or Downstream.

Back 40

Upstream and always the negative side of joint

270' is Downstream

Front 41

What are the two types of encoding?

Back 41

Time Based

Wheel encoder

Front 42

The Encoder should be calibrated to what percent of accuracy over a 20" length?

Back 42

1%

Front 43

What is the maximum drop-out of the scan area you are allowed to have?

Back 43

5% but no more than 2 adjacent 1mm lines

Front 44

Phased Array Probes are dampened at what cycles?

Back 44

1/2 to 1 cycles

Front 45

As focusing ability increases, the depth of the field ....

Back 45

Decreases

Front 46

Using an OmniScan system with a designation of 16;128, the 128 indicates what?

Back 46

the maximum number of elements that can be used

Front 47

The maximum number of elements that can be fired at one time is primarily dependent upon what?

Back 47

Based on the number of pulsers in the Phased Array unit

Front 48

Which scan is one set of elements used and different focal laws are applied to steer through a sequence of angles

Back 48

Sectorial Scan

Front 49

T/F For equivalent aperatures, as pitch increases, grating lobe will increase?

Back 49

True

Front 50

A standing wave produced by the phased array probe is defined as what?

Back 50

Grating Lobes