Industrial ultrasonic transducers
The reference for phased array probes
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PHASED ARRAY

Principle
Virtual examples
Design notes for phased array
Probes performances

LINEAR ARRAYS
Acoustic solutions - NEW
General purpose arrays
High penetration / wide scan arrays
Small footprint arrays
Low profile arrays

MATRIX ARRAYS
High density matrix arrays
General purpose matrix arrays
High resolution matrix arrays

FLEXIBLE SOLUTIONS
Smart contact linear arrays
Conformable wedges - NEW
Smart contact matrix arrays
Low frequency contact matrix arrays - NEW
Low profile contact arrays

OTHER ARRAYS
TRL/SE arrays

Curved arrays
Annular arrays
Daisy arrays
Circular arrays

ACCESSORIES
Wedges
Cables & connectors

T.O.F.D.
Contact
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NDT Applications
Nuclear & power generation
Aeronautics
metal Industry
Petrochemical
Transportation
Measurement
Application examples

Contact Phased Array Transducers

Contact phased array transducers are the most commonly used, as their wide variety enables them to be used for many different applications.
They also allow to generate variable angle refracted beam without wedge, which helps to solve size problems for reduced access applications.

Principle

Contact phased array transducers typically combine electronic beam steering and focusing.
To avoid grating lobes, they require a relatively small inter-element pitch.
For linear arrays, the number of elements is typically less than 128, and even 64, as electronic scanning is not often used.
Matrix arrays require 2D sampling, which can easily require up to 256 elements or more.

Advantages

These transducers can work with angles and electronically-adaptable focusing depths, i.e. without changing or moving the transducer. This allows, in particular:
- a smaller number of probes to be used,
- faster inspection.

They also allow a refracted, non-zero incidence beam to be generated without using a wedge, which opens new possibilities for when there is no room to use a wedge.

Types of Probes

Contact phased array transducers can be classified according to three criteria that can be combined totally independently.

The type of array
- Linear arrays (1D) allow a beam to be driven on a plane
- Matrix arrays (2D) allow 3D steering

The coupling mode
Direct contact, removable or integrated wedge (See below)

The principle of emission-reception
Single-unit or separated transmitter-receiver (TRL/SE probes)

Direct Contact, Integrated or Removable Wedge?

Contact transducers can integrate a non-removable wedge, can be adapted to different removable wedges, or can be used in direct contact without a wedge.

Direct contact

In some cases, contact transducers can be used without a wedge, for example, if there is not enough space available, or to avoid interference echoes from the wedge.
In this configuration, the unseen area below the surface is larger because of the ringing of the excitation signal. Furthermore, deflection without grating lobes at high angles will require smaller spacing, and consequently a larger number of elements.
Finally, in this case, shear waves cannot be generated by mode conversion at the interface between the wedge and the part to be inspected.

Hard face

Wear and tear on the front face may have unexpected effects on probes, such as water penetration or modification of electroacoustical properties.
Conversely, placing a protective layer may alter the pulse length and sensitivity due to the additional interface.
For this reason, IMASONIC has implemented a new hard face material that combines appropriate acoustical impedance for high energy transfer and ten times higher resistance to wear than a conventional front face.

Integrated wedges

An integrated wedge allows a transducer to be more compact and often better adapted to industrial conditions. The coupling between the active part and the wedge is guaranteed by being glued during manufacturing.
Thus it is constant and homogeneous, requires no maintenance and guaran- tees a high level of performance.

Removable wedges

Removable wedges have great flexibility and enable the same transducer to be used in several different configurations. They can also be replaced easily if they show wear or are damaged.

 

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