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Enhanced focusing probes
The fermat concept
Aspherically focused active area
Set of transducers for 6" titanium billets multizone
inspection
Large aperture, aspherically focused matrix array probe
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Principle
Aspherically focused active area is calculated
to focus on a precise point in the material with a given refracted
angle, through a flat, cylindrical or toric interface.
The large active area combined with this mechanical focusing allows
very high lateral resolution and signal to noise ratio.
It is typically used in immersion with pulse echo
technique, but can also be used in contact with a delay.
Applications
Thick pieces and non homogeneous materials
inspection.
- Multizone billets inspection
- Thick plates inspection
- Heavy forged parts inspection
- Nuclear vessel inspection
Advantages
- High resolution and signal to noise ratio.
- Beam profile very close to simulation thanks to piezocomposite
technology.
- Compatible with phased array technology.
Typical configurations
Centre
Freq.
(MHz) |
Active diameter
(mm) |
Refracted angle
(°) |
Focusing depth
(mm) |
Interface
Geometry |
Water path
(mm) |
Beam width
(-6dB) at the focal point (mm) |
| 2 |
100 |
45° SW |
300 mm in steel |
Cylindrical concave R=100mm |
30 |
10 x 7 mm |
| 5 |
60 |
0° LW |
125 mm in titanium |
Cylindrical convex R=125mm |
76 |
4 x 3 mm |
| 7.5 |
50 |
45° SW |
50 mm
in steel |
Cylindrical convex
R=400 mm |
15 |
1 x 0.7 mm |
Transducer and electrical matching box for 180°C
inspection in immersion
Focused transducer for rotor forged disc inspection from the
internal bore
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Configurations above are indicative and may be
adapted to any particular need
Main characteristics
- Active part in piezocomposite material
- Centre frequency (-6dB) : from 1MHz to 15 MHz
- Relative bandwidth (-6dB) : 60 to 90 %
- Acoustic impedance matched to water
- Watertight stainless steel housing
Options
- Custom wiring (cable length, type or positioning,
connector type)
- Housing adaptation to mechanical set-up (probe holder, wedge ..)
- Adaptation to environmental constraints (Temperature, pressure,
radiations, vibrations..)
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