Inspection of Complex Geometries using Flexible Phased-Array Transducers
The piping inspection in nuclear power plants uses ultrasonic techniques, and their implementation is often performed with contact methods. The control is efficient, and the transmission is maximized when the wedge of the transducer is adapted to the surface of the component. However, the fixed shape of wedge can not be matched to all inspected zone when the component presents a variable surface (elbow, nozzles, butt weld?-). In that case, the transmitted field is more or less disturbed and can lead to wrong flaw localization and characterization. To optimize the contact inspection with this type of component, flexible phased-array techniques have been developed, taking advantages from instrumentation and software developments. Firstly, the CIVA software is used to design the element arrangement and to evaluate its ability to detect defects. In operation, an embedded instrumentation measures in real time the current shape of the emitting surface. From this data, the M2M acquisition system calculates in real time the delay laws to be applied to the elements to compensate the deformation and thus to control the beam characteristics during the displacement of the probe. This first part of this paper presents experiments carried out to inspect a 2D real profile mock-up including artificial defects. Performances are evaluated using recent developments of the embedded algorithm to calculate delay laws in real time (multi-shot configuration). The second part shows examples of industrial inspections of a complex 3D mock-up using the 3D flexible array piloted by a robot. CIVA software reconstruction functionalities are also presented to reconstruct acquisition data according to the embedded parameters.
Non Destructive Techniques Ultrasonic Methods Flexible Phased-ArrayTransducer
Gw(e)na(e)l TOULLELAN Arnaud NADIM Olivier CASULA Philippe DUMAS Elie ABITTAN Lo(i)c DOUDET
CEA/LIST; Saclay, France IMASONIC; Voray-sur-l?ˉOgnon, France EDF; France
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
2067-2073
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）