A system that detects damages in steel cables used by ziplines and cable cars.
To prevent accidents caused by cable breaks.
There are 2 components to this system:
Constant audio monitoring
The cable is basically a string. Attach microphones at both ends and monitor the sound as the cable is being used. The software first determines a "baseline" of what is normal. If any wires in the cable break, the sound would change and an alarm would sound off.
Once per day video inspection
Every day, or whenever an inspection is required, a video trolley runs over the entire cable. 4 slow-motion cameras surround the cable and record the entire length of it. The section where the cameras are located is enclosed and artificially lighted with LEDs. This ensures an uniform lighting that doesn't depend on the outside conditions.
Software then compares the video to all the previous videos and highlights any changes.
In addition to the cameras, there are 4 wheels touching the cable from all sides. The wheels detect any bumps that then get highlighted on the video as well.
The video trolley always has the same weight. During a trolley run over the full cable length, the audio monitor can compare the results to previous trolley runs. The results should be more precise since fewer variables are changing.