Transducer Online Workshop

Transducer Online Workshop - Quiz

You will need a browser that enables Java scripts.
You could save this file 'trans_qz.htm' on your disk and execute it off-line.
If you have problems you could brows the Quiz as a simple list

Your results you can get after you finished the Quiz.

1-3 Composite Transducers provide a higher acoustic Impedance than PZT Transducers.
True
False
What material is used for ultrasound generation?
Copper
Piezoceramic
What polymer is the most effective transducing material?
PVX1
PVF2
Polymer transducers work effectively as?
transmitter
receiver
both
Can piezoelectric transducers be used to perform test at single digit Kelvin Temperatures (0 deg. C = 273 degree K)?
Yes
No
While using an ultrasonic through-transmission method, a near surface flaw , such as a void in Carbon-Carbon material is better detected?
a) when the wet squirter method is used
b) when a non-contact air-coupled method is used
Which transducer has the smaller focal spot size?
a) A 1 inch diameter, 1 MHz test frequency, focal length 1.5 inches in water
b) A 1 inch diameter, 400 kHz test frequency, focal length 1.5 inches in air
Air cannot be used as an ultrasonic couplant.
a) True
b) False
Polymer probes are compared to conventional ceramic probes are:
a) more noisy
b) less noisy
Ultrasonic NDT at elevated temperatures is.
a) only possible when the probe is cooled down to less than 60 °C with water or air
b) not possible
c) possible with special probes up to 800 °C surface temperature
Piezocomposite transducers are preferably used for.
a) Normal beam probes in direct contact with steel
b) Immersion or delay line probes
Variable steering can be obtained with:
a) mechanical rocking/rotating transducers
b) electronic phased linear array
c) electronic phased annular array
d) electronic phased bi-dimensional
Aspherical focusing is used to:
a) provide a sharp focus by compensating aberration effects when transmitting or receiving through refractive interfaces
b) create asymetrical beam in the inspection of oriented flaws.
The performances of array transducers are:
a) limited in bandwidth and temporal response due to coupling effects inside the array structure.
b) comparable to single element transducers for bandwidth and temporal response.
Schlieren measurements of acoustic fields are based on:
a) Change of color with pressure
b) Doppler interaction of light with particle displacement
c) Pressure changing the index of refraction
d) Optical wave changing phase
If an acoustic beam propagates along the Z axis, the resulting image has brightness that corresponds to:
a) Intensity in the X-Z plane
b) The integral of phase retardation along the light path squared.
c) The integral of phase retardation along the light path squared.
d) The intensity everywhere.
For a 3-D map of the acoustic field one needs images:
a) From three views (XZ, YZ and XY)
b) From two views (XZ and YZ) only.
c) From many views that include the Z axis.
d) From any direction perpendicular to the Z axis.
e) Depends on the beam geometry.
Which wave modes can be generated by the Multifunction UT-Phased Array Probe?
a) shear waves.
b) longitudinal waves.
c) lamb waves.
d) a and b.
Which features are essential for the Multifunction UT-Phased Array Probe?
a) large dimensions, high sensitive, waterproofed connectors, high signal to noise ratio.
b) small dimensions, high sensitive, large bandwidth, high signal to noise ratio.
c) small dimensions, thin plastic housing, low signal to noise ratio, large bandwidth.
d) none of them.
What are the main advantages for the use of the Multifunction UT-Phased Array Probe?
a) small probe arrangements
b) reduced scantimes
c) substitution of several standard UT-probes
d) all of the above
What transducer would I pick to test the bonding of 1 mm Al to 100 micrometer thick Delrin plastic. The bondline is expected to be 1 micrometer or less ?
a) 5 MHz PZT-4 so as to penetrate the Delrin.
b) 15 MHz lead metaniobate flat.
c) 40 MHz lead metaniobate focused.
d) 40 MHz PVDF focused.
You need to detect small intergrannular stress corrosion in an austinetic allow in or near a weld. Experience dictates the use of low frequency, horizontally polarized shear waves, or focused beams. What transducer to you select?
a) Use standard 2.25 MHz 45 shear wave probe.
b) Use standard 1 MHz 45 shear wave probe.
c) Use a horizontally polarized 45 shear wave probe.
d) Use a focused 45 shear wave probe with aspherical focus.
e) Use more than one of the above methods.
You want to do flaw detection in plastic pipe and the material is very lossy with high attenuation even at 2 MHz. The piping is 10 mm OD and 5 mm ID and you must inspect at a high rate. What sort of transducers would you choose?
a) 1 MHz flat
b) 2 MHz flat
c) 5 MHz flat
d) 1 MHz cylindrical focus
e) 1 MHz spherical focus

Authors of this Quiz were the panel of experts of the first online Workshop about transducers.

Gerhard Splitt
Institution:
Krautkraemer - Germany Yoseph Bar-Cohen
Institution:
NASA-JPL - USA Robert A. Day
Institution:
Second Sound - USA Werner Rathgeb
Institution:
Siemens - Germany Willem (Bill) A.Grandia
Institution:
QMI - USA Gérard Fleury
Institution:
IMASONIC - France Klaus Matthies
Institution:
BAM Berlin - NDT Department 8 - Germany