Intelligent sensor-technology to detect and quantify dangerous damage over large distances in inaccessible areas by using long range multiparameter ultrasound-computed tomography (INTACT)

Non-Destructive Testing (NDT) plays a crucial role in ensuring the integrity and safety of industrial structures, particularly in the realm of corrosion detection. Guided wave techniques, particularly those excited by Electromagnetic Acoustic Transducers (EMATs), have emerged as promising methods for inspecting large structures such as pipelines, storage tanks, and bridges [1, 2]. The primary objective of the research project INTACT [3] is to develop an effective and reliable method for accurately detecting and characterizing the geometric properties of corrosion defects in metallic pipeline structures. Traditional NDT methods often struggle with inspecting inaccessible or buried pipelines, making early detection of corrosion challenging. Guided wave tomography offers a solution by utilizing guided waves that propagate along the structure, allowing for inspection over large distances and through various materials [4]. The challenges in the INTACT research project include optimizing the arrangement and control of the EMAT sensors as well as data fusion and evaluation in order to achieve maximum sensitivity and resolution in corrosion detection. A well-defined number of different sensor configurations are operated in parallel to capture both transmission and reflection signals from corrosion defects at different angles of incidence relative to the axial direction of the pipe. This approach (signal information at varying angles of incidence) enables the reconstruction of a comprehensive picture of the internal structure and facilitates the precise localization and sizing of corrosion anomalies. Furthermore, the research investigates advanced signal processing techniques to enhance the quality of the acquired data and improve defect characterization. Signal processing algorithms are employed to extract meaningful information from the received signals, such as the amplitude, time-of-flight, and phase, allowing for accurate assessment of corrosion severity and morphology. This research significantly advances non-destructive testing by enhancing sensor configurations and signal processing algorithms in INTACT. It particularly focuses on guided wave technology for corrosion detection and quantification. Combining guided wave tomography with EMAT sensors offers multiple benefits, including swift scanning inspections without requiring full pipe access. This approach holds promise for assessing corroded pipelines, crucial given aging infrastructure. By tackling key challenges and leveraging sensor tech and signal processing, this research aims to boost reliability, efficiency, and safety while cutting maintenance costs.