In structures such as buildings or bridges, even small deformations can lead to cracks or other more serious problems. To detect defects early, a team of researchers at the University of Stuttgart has developed a laser-based building deformation monitoring system. It is worth mentioning that the device combines multiple lasers that are permanently mounted on the front of the building and irradiated externally. Not only is detection faster than other options, but it is also cheaper.
Test benches used in the study (from: Flavio Guerra / University of Stuttgart)
Each of the laser sources can be captured by an image sensor mounted on a tripod 10 meters (32.8 feet) from a building.
The computer connected to it is able to continuously receive holographic light point patterns and analyze whether there are structural problems.
If any one laser moves smaller than the other lasers, a mismatch in this mode triggers an alarm of the system.
Although there have been systems that have used fiber optic sensors to measure the shape of buildings, the cost of the hardware systems involved is much higher than the plans of the Stuttgart University research team.
Typically, the construction system can be built into the structure of the building at the time of construction, but can also be added later.
Existing systems are able to shine light on the structure of a building, then use the camera to capture images and conduct visual analysis through a computer.
But the university’s new system, which is said to work faster and more precisely, is expected to work even faster and more precisely because it directly shines a laser on the camera’s image sensor.
So far, the team has conducted tests on a 9-meter (29.5-foot)-tall building frame and found that the readings obtained by the laser-plus camera are similar to those detected using a vibratometer and strain gauge sensor.
Further development is carried out, the system can be used not only to warn, but even to respond to the structure itself.
One day, team member Flavio Guerra said, we might be able to build lightweight buildings in response to complex wind shears and even relative lying in re-earthquakes.
This type of adaptation requires the call of extremely accurate building deformation measurements to estimate the current state and predict the possible direction of movement of the building.
Finally, details of the study, led by Dr. Tobias Haist, have been published in the recently published journal Applied Optics.
Originally published as “Precise force force over the mean using using holland multipoint replication.”