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Principle
Virtual examples
Design notes for phased array
Probes performances

IMMERSION ARRAYS
Linear arrays
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CONTACT ARRAYS
LInear arrays
Small footprint arrays
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2D smart flexible arrays
1D smart flexible arrays
Extra flat flexible arrays

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Application examples

 

Immersion transducers

Linear Array Transducers

Applications

1

1

Automated high-performance inspection of submerged parts: metal plates, bars, pipes, composite materials, forged parts, etc.

Principle & Advantages

The scanned length (L) is maximised by combining a large number
of elements (typically between 64 to 512) with the widest possible
inter-element pitch (p).

Electronic focusing can be combined with scanning, for example, to inspect at different depths. In general, electronic deflection is little used for this type of application.

  • Inspection time is reduced through the high speed of the electronic scanning combined with a large scanning width.
  • The scanning mechanism is simplified.

Standard Configurations:

Freq.
(MHz)
Nb elts
Pitch p
(mm)
Active size
L x h (mm)
Housing size
L x W x H
(mm)*
10
64
0.5
32x10
40x16x35
10
128
0.5
64x10
75x20x40
5
64
1
64x15
75x20x40
5
128
1
128x15
140x25x45
2.25
128
1.5
192x15
205x30x45
2.25
64
2
128x20
140x30x35

*Indicative values

General Characteristics

  • Frequency from 300 kHz to 20 MHz
  • Unlimited number of elements, typically from 64 to 512
  • High sensitivity and signal-to-noise ratio thanks to the acoustic matching to water
  • Good axial resolution and reduction of the unseen area beneath the surface thanks to a short pulse length
  • Reproducibility of the inspection because of the homogeneity of the elements of the same probe and the different probes of the same type
  • High reliability over time thanks to a design that is watertight and resistant to corrosion, compatible with permanent immersion under 1m of water

Options

  • 1Pre-focused active area (see below)
  • Housing adapted to the probe holder
  • Low profile and side cable for wheel probe
  • Halogen-free for nuclear environments
  • Customized cabling
  • Adaptation to a particular environment (temperature, pressure, radiation, chemical compatibility)

Mechanical Pre-focusing

On linear arrays, electronic focusing is possible only in the plane of incidence. However, in the perpendicular plane (passive aperture), it is possible to adjust focal depth and lateral resolution by using mechanical pre-focusing, by choosing the appropriate radius of curvature, active width (h) and water path.

1

Flat array
pre-focused array with various radiuses of curvature

 

 

 

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