4 Sensors technology from Sensitive Object allows to tactilize any large solid surface (glass, gypsum walls, etc.) using 4 sensors. The technology uses TDOA (Time Difference Of Arrival).
When we touch a solid surface, the time difference of acoustic wave to go from impact point to each of the 4 sensors S1, S2, S3 and S4 allows calculating the initial impact point (initial touch).
Advantages
Flexible: free button creation on site
Reconfiguration
Adapted to large surfaces, even the ones already installed
Large touch areas
Drawbacks
less accuracy than ReverSys®
