The TLS, a laser measuring tool used to detect deterioration within architectural structures, was used by researchers from the University of Salamanca to assess the state of the city walls of Ávila. The recently-invented system is used in monument maintenance work, above all on structures built centuries ago.
“The laser takes a very quick reading of the structure, from which we obtain a three-dimensional image,” Diego González Aguilera, co-author of the study published in the journal Nondestructive Testing and Evaluation, and an engineer at the University of Salamanca, told SINC.
The work began with data collection. This involved the researchers measuring the Ávila walls in situ, specifically the belfry of the Puerta del Carmen gate, using a TLS. “This scanner emits a laser beam which bounces off the monument and returns to an internal sensor, measuring the distances between each point of the wall,” says the expert, adding that “the laser beam sweeps the entire surface of the monument”.
The TLS takes two measurements, one of the inside part and the other of the outside of the walls, using 1.5 million and 2.5 million points, respectively. “These data are then analysed in the laboratory, where algorithms are used to create a 3D representation of the surface of both sides,” says the researcher.
“One measurement alone is not enough to evaluate damage, however,” adds González Aguilera, “because each must be compared with previous or later samples.” In this study, the researchers collected data at a six-month interval, because “the further apart in time the samples are taken, the greater the changes that can be observed”, he explains.
This allows two types of architectural pathologies to be picked up: collapse, which is a wall’s loss of verticality, and complete movement of the wall itself. The engineer points out that “the two sets of data and the amount of information collected must correlate in order for the results of the study to mesh together properly”.
Other methods besides the TLS are used in to evaluate architectural structures. “The most classic is the theodolyte system to measure topography, although there are also other tools such as GPS,” explains Aguilera. This study used the TLS because it is a new system that does not damage a structure and “it had to be tested in a complex situation”.
SINC Team | alfa
Smart buildings through innovative membrane roofs and façades
31.08.2017 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
Concrete from wood
05.07.2017 | Schweizerischer Nationalfonds SNF
A study carried out by an international team of researchers and published in the journal Physical Review X shows that ion-trap technologies available today are suitable for building large-scale quantum computers. The scientists introduce trapped-ion quantum error correction protocols that detect and correct processing errors.
In order to reach their full potential, today’s quantum computer prototypes have to meet specific criteria: First, they have to be made bigger, which means...
Since 2016, German and Spanish researchers, among them scientists from the University of Göttingen, have been hunting for exoplanets with the “Carmenes”...
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
18.12.2017 | Information Technology
18.12.2017 | Physics and Astronomy
18.12.2017 | Agricultural and Forestry Science