The reference for phased array probes
Curved Linear Array
Curved arrays for tubes & bars inspection
Curved arrays for composite stengtheners
These transducers are an adaptation of flat linear
arrays for the inspection of parts with circular symmetry. The linear
scanning becomes circular to adapt to inspection of tubes, bars
- Tubes & bars inspection
- Aircrafts composite strengtheners inspection
360° or sector electronic beam scanning is
combined with electronic focusing and beam steering.
- Scanning speed can be adapted to the water path.
- Focusing depth and inspection angle can be
electronically selected depending on the tube/bar
- Frequency from 1 MHz to 20 MHz
- Number of elements unlimited, typically 64 to 512
- High sensitivity and signal-to-noise ratio, thanks to the acoustic
matching to water that allows a very good transfer of acoustic
- Good axial resolution, and reduction of the unseen area below
the surface thanks to a short pulse length
- Reproducibility of the inspection through the homogeneity of
performance between the elements of the same probe, and between
of the same type
- High reliability over time thanks to a watertight and corrosion-resistant
design, compatible with permanent immersion under one metre of
water in aggresive industrial environments.
Actually there is no standard configuration!
The frequency, the number of elements, the spacing and the radius
of curvature are defined according to the tubes, bars or sections
to be inspected, the defects to be detected and the desired inspection
speed in particular.
- Pre-focused active area (See Page 23)
- Housing adapted to the probe holder
- Customized cabling
- Adaptation to a particular environment (temperature, pressure,
radiation, chemical compatibility)
A single circle or multiple
For 360° inspection of tubes or
bars, either a single encircling probe or an arrangement of
several probes each covering a sector, typically 45° to
90°, can be considered.
Both possibilities offer various advantages and disadvantages.
The sectorial probes require a certain overlap
for a homogeneous inspection of the whole circumference. They
must therefore be placed in at least two rows, which requires
greater axial space. Because of the necessary overlap, a greater
total number of electronic channels are also required.
A single probe has the advantage of needing
less space, and of optimizing the number of useful channels
since no overlap is needed.
The inspection of bars or tubes often requires
the use of several simultaneous
beams on the same circumference. In the case of a single probe,
reflexions of a beam may cause interference to the inspection
beams. Arranging the probes over several rows enables this
effect to be
limited where necessary.
Finally, while the purchase price of each
option is not very different, the maintenance
cost of the sectional curved probes is markedly lower, as
only part of the circumference
can be replaced.
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