BS EN 16018:2011 pdf download – Non-destructive testing — Terminology — Terms used in ultrasonic testing with phased arrays

BS EN 16018:2011 pdf 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. Terms 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 isaxial NOTESee 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 ofindividualarray elementsoperatedsimultaneously 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 NOTE For linear arrays see Figure 10. 3.1.15 space between elementsgap between elements distance between two adjacent elementsNOTEFor linear arrays see Figure 10. 3.1.16 active aperture group of active elements when transmitting and/orreceiving 3.1.17 elementary aperture active aperture made of only one element 3.1.18 primary axis of an array main axis for beam-steering parallel to the width ofthe elements NOTESee Figure 8. 3.1.19 secondary axis of an array axis perpendicular to the primary axisNOTESee Figure 8. 3.1.20 reference point on the wedge coordinates of the point on the wedge which isused to position a defined point of the array 3.1.21 sensitivity curve of an array representation of the sensitivity of each elementsuccessively connected to the same channel, whenusing a flat reflector much larger than the apertureof the array 3.1.22 natural refracted...