Abstract
The amount of bridge beam deflection is a key indicator for health monitoring of the railway structure. Most of current measurement of bridge beam deflection uses contact-type sensors which have difficulties in setting bridges hardly accessed. We propose describes non-contact type measurement of bridge beam deflection, where deflections are measured by analyzing motion in digital image sequences remotely captured by general digital camera. This paper introduces the method of calculating dynamic deflections from the photographic image and shows some measurement examples.
