Working group
Ultrasonic sensors used on complex geometrical and material combinations, in short transducers, play a key role in solving any ultrasound testing problem. The decision on whether a specimen can be inspected at all depends on the proper selection and adaption of transducers. In the case of components with complex geometries and/or other conditions such as high temperature and anisotropy of the material, reliable testing is only possible using a special transducer whose acoustic properties are transmissibility adapted to the material or particular test condition.
Division VIII.4 is engaged in the development of transducers for application
under adverse conditions
Transducers to detect cracks at the foot of turbine blades in assembled condition (enlarged picture)
Transducer to detect surface cracks in generator bar made of copper (enlarged picture)
Speciality: The transducer wedge consists of polytetrafluorethylen (PTFE, e.g. teflon). Taking into consideration the acoustic transformation properties, the elements of the transducer are assembled by compressing them together instead of using adhesive.
Dual element (transceiver) angle beam probes employing longitudinal waves
for investigation of austenitic welds, for use at temperatures up to 200 °C (enlarged picture)
Normal beam transmitter receiver transducer for determining wall thickness up to 1000 °C (enlarged picture)
Single element transducer for the temperatures in the range of 400 °C to 500 °C (enlarged picture)
Wall thickness measurement using a single element transducer for the temperatures in the range of 400 °C to 500 °C from the inner surface. For example, wall thickness measurement of fired galvanizing vessels, or boilers containing salt bath for hardening systems.
Speciality: Individual components of the transducer are pressed together and glass soldered.
