Abstract
The use of non-metallic composites that are durable, low cost, and lightweight is growing fast in various industries. A commonly used form of these materials is in the shape of pipes that can be used, for instance, in oil and gas industry. Such pipes can be damaged due to material loss (defects and holes), erosions, and more which may cause major production failures or environmental mishaps. To prevent these issues, non-destructive testing (NDT) methods need to be employed for regular inspections of such components. Since traditional NDT methods are mainly used for metallic pipes, recently microwave imaging has been proposed as a promising approach for examination of non-metallic pipes. While microwave imaging can be employed for inspection of multiple layers of pipes, the effect of undesired eccentricity of the pipes can impose additional imaging errors. In this paper, for the first time, we study the effect of eccentricity of the pipes on the images reconstructed using near-field holographic microwave imaging when imaging double pipes.
Highlights
Non-metallic pipes and composite components such as fiber reinforced plastic (FRP), glass reinforced epoxy resin (GRE), high density polyethylene (HDPE), reinforced rubber expansion joints (REJs), carbon fiber reinforced plastics (CFRP), and polyvinyl chloride (PVC) are replacing metallic pipes throughout different industries due to advantages such as durability, low cost, light-weight, resistance to corrosion, etc
non-destructive testing (NDT) methods such as ultrasonic testing, radiography, eddy current, and magnetic flux leakage have been widely applied in different industries for inspection of metallic components
It is worth noting that the effect of other important parameters for the considered microwave imaging setup such as thickness, radius, and permittivity of the pipes as well as angular separation of the antennas have been already studied in [15] and will be excluded here
Summary
Non-metallic pipes and composite components such as fiber reinforced plastic (FRP), glass reinforced epoxy resin (GRE), high density polyethylene (HDPE), reinforced rubber expansion joints (REJs), carbon fiber reinforced plastics (CFRP), and polyvinyl chloride (PVC) are replacing metallic pipes throughout different industries due to advantages such as durability, low cost, light-weight, resistance to corrosion, etc. NDT methods such as ultrasonic testing, radiography, eddy current, and magnetic flux leakage have been widely applied in different industries for inspection of metallic components. These NDT methods cannot fulfill the demand for testing certain materials and components such as non-metallic composite pipes. Radiography relies on the use of X-ray [4] which requires extra safety measures.
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