At first glance, such large objects as buildings or bridges are generally not subject to the effects of natural elements - rain or wind. But actually it is not. A new technique developed by specialists from the Massachusetts Institute of Technology (MIT), based on high-speed shooting and computer vision, allows you to capture even minor fluctuations.
Today, such monitoring is based on the use of numerous accelerometers, laser beams or acoustic waves. The advantages of these methods include accuracy, and the disadvantages are high cost, high time costs and the ability to measure only one point of an object at a time.
The technique proposed by MIT experts involves the use of just one high-speed camera to monitor the entire object without physical contact with it.
During one of the experiments, a Phantom V10 high-speed camera (20, 000 frames / sec) was used, with the help of which the cantilever beam and PVC pipe were taken after being hit with a hammer. At the same time, the vibrations were recorded by an accelerometer and a laser vibrometer.
When viewing the footage in normal mode, no changes were found, but as soon as the video information was passed through the computer vision software, vibrations of the pipe and the laser beam resting on it immediately appeared.
The researchers are confident that the technology they have created will be in demand when monitoring buildings, bridges, pipelines and other industrial facilities.