Imasonic 1-3 piezocomposite
Imasonic has developed a specialised
know how and several technological processes based on the concept of
piezoelectric composites with a ceramic polymer structure known as the
1-3 piezo-composite structure.
of Imasonic transducers are based on this technology.
Piezocomposite materials are made of
thin rods of ceramics embedded into a polymer material. Their properties
depend on the ceramic and polymer properties and on the microstructure
Piezocomposite materials have a high
coupling coefficient that confers to the transducers a high sensitivity
and signal to noise ratio (+10dB to +30dB compared to conventional technology).
The intrinsic damping of these material
allows a high bandwidth, while keeping a good sensitivity.
The lower and adjustable acoustic impedance
allows a higher energy transfer in water, and a lower reverberation
level on the front face for immersion applications.
The 1-3 structure of the composite avoids
radial vibration modes. This performance directly benefits to the beam
pattern and pulse shape. Moreover it allows the manufacturing of phased
array transducers with low cross coupling between neighbour elements.
Piezocomposite materials can be mechanically
focused. This property allows the manufacturing of cylindrical, spherical
or curved transducers without using acoustic lens. Lens attenuation
is avoided and allows a more predictable beam pattern.
Piezocomposite materials also have a
higher mechanical resistance, that confers to the transducers
a higher resistance to mechanical shocks, vibrations, temperature
constraints and pressure constraints.
"Piezocomposite technology : An innovative approach to the improvement of
N.D.T. performance using ultrasounds", J. Poguet, P. Dumas, G. Fleury –
IMASONIC S.A. ,8th European Conference on Non Destructive Testing, June 2002,
Download pdf (23kb)
"Improvements of Ultrasonic Inspections through the use of Piezo Composite
Transducers", G.Fleury - IMASONIC S.A., C.Gondard - CEA, 6th European Conference
on Non Destructive Testing, October 1994, Nice France
Download pdf (623kb)