Object`s e.g. seat and glass, damages signaling device for e.g. bus, has bridge set to zero if bridge is in equilibrium, where bridge equilibrium gets upset if damages occur in object and bridge outputs signal that is digitally coded

摘要

The device has a measuring bridge (1) built in a flexible/concrete object to be monitored. The bridge is set to zero in a normal condition by a potentiometer if the bridge is in equilibrium. The bridge equilibrium gets upset if thermal/mechanical damages occur in the object, where the bridge outputs a signal that is amplified and digitally coded. The bridge is installed via resistance wires (1a) whose resistance changes during heating.