As a dynamic non-contact system, the Imetrum measurement system can be an unobtrusive solution when it comes to monitoring buildings, particularly those that are historic, delicate or of great public significance. Avoiding the need to attach localised sensors or reflective targets required by traditional techniques reduces visual impact and minimises disruption to day-to-day operation.
As well as day-to-day monitoring, collected video can be assessed after an event to pull out actual displacement, bending and rotation data. This can be useful for monitoring when there are nearby construction works, for assessment after earthquakes, or where there are concerns about subsidence and crack growth. Data from a large number of cameras can be easily synchronised so that multiple points of interest can be monitored, as well as an understanding of global structural performance.
The specific monitoring regime is designed on a case-by-case basis for long term installations. The system's ability to use existing patterns, including mortar joints or internal decorative detail, is particularly valuable for historic structures (as in the case of this London church). For more modern glass and steel constructions, the added precision of attaching self-adhesive bullseye targets is often the preferred method.
Where the need to be unobtrusive is important, it is good to know that the Imetrum system can operate with the use of infra-red illumination. This is not visible to the human eye, yet provides an excellent quality image for the Imetrum system. It is therefore possible to monitor day and night without altering the ambience of a location.