An inductive scanning system for two-dimensional imaging of reinforcing components in concrete structures

A novel form of imaging steel reinforcing components in concrete is described which employs a scanning inductive sensor. A host computer, linked to the scanning and data acquisition system, generates grey-scale images whose intensities are proportional to the signal strengths produced by the sensor. Simple signal subtraction algorithms have been employed to achieve considerable improvements in image contrast, spatial resolution and the extraction of dimensional information. (Original abstract-amended)