Abstract
This study notes that the magnetic perturbation cable system hasthe sensitivity, resolution, repeatability, long term stability, and adaptivity to perform nondestructive inspection and monitoring tests of structural cables and strands of suspension bridges. This article presents laboratory results, and field demonstration results. Itis noted that flux densities higher than that provided by the electromagnet would be required to detect very small flaws such as corrosion pits. Results from scanning laboratory specimens indicate that systems of this type should be capable of providing precise, stable, quantitative, nondestructive evaluation.