System and method for detecting corrosion in reinforced concrete

(10) GB2632101A

(22) 18.07.2023

(43) 29.01.2025

(57) A multi-spectral camera captures image data at a plurality of pixels. For each pixel, the data comprises a spectral signature which a measurement of reflectance across a predetermined range of wavelengths. A processor receives from the multi-spectral camera image data of a surface of reinforced concrete. The processor determines that corrosion is present in the reinforced concrete if the spectral signature captured at one or more pixels complies with at least one criterion. The criteria are: (i) reflectance at the longest wavelength of the range is greater than at the shortest wavelength; (ii) a peak in the spectral signature is identified within the range; or (iii) that the difference between RB and RA is greater than 3, the difference between RB and RC is greater than 1, and the difference between RC and RA is greater than 0, where RA, RB and RC are the reflectances at 650 nm, 750 nm and 900 nm respectively.

(71) Eratosthenes Centre of Excellence, CY