BS EN 16018:2011 pdf free download Non-destructive testing — Terminology — Terms used in ultrasonic testing with phased arrays
1 Scope
This European Standard defines terms used inultrasonic testing with phased arrays.
2Terms relating to sound
2.1
side lobes
beams,generated by a transducer,that deviatefrom the direction of the main beam
2.2
grating lobes
parasitic replications of the main beam caused byspatial undersampling (pitch between elementscompared to wavelength)
3Terms relating to test equipment
3.1 Arrays
3.1.1
array
piezo-electric plate divided into several elements
3.1.2
array elementelement
smallest part of the array acting as a transducerNOTESee Figure 11.
3.1.3
arrangement of the array
distribution of all the elements in an array
3.1.4
linear array1D linear array
array of elements arranged in a single straight lineNOTESee Figure 1.
3.1.5
annular array
arrayofring-shapedelementsarrangedconcentrically where the major transmitting axis is
axial
NOTE
See Figure 2.
3.1.6
annular sectorial array
annular array with the rings divided into sectorsNOTESee Figure 3 and Figure 9.
3.1.7
encircling array
array arranged on a complete or partial circle,where the major transmitting axis is radial
NOTESee Figure 4 and Figure 7.
3.1.8
convex array
encircling array typically used for the inspection oftubes from the inside
3.1.9
concave array
encircling array typically used for the inspection oftubes from the outside
3.1.10
dual array probe
probe with separate arrays for transmitting andreceiving
NOTESee Figure 5.
3.1.11
virtual probe
group ofindividual arrayelements operatedsimultaneously with adapted delay laws
3.1.12
matrix array
two-dimensional array of equal or non-equal sizedelements
EXAMPLE
See Figure 3.
3.1.13
2D matrix array
rectangular matrix array
NOTESee Figure 6 and Figure 8.
3.1.14
pitch
distance between the same edges or centres of twoadjacent elements
NOTEFor linear arrays see Figure 10.