Using LoRa wireless communication to build a distributed bridge monitoring system

using acoustic emission technology for data collection

and transmits data to the host computer by wireless communication.Then

the time difference of arrival（TDOA） positioning algorithm is used to determine the defect size

location

and hazard level

and early hidden dangers are found

and effective measures are taken to avoid accidents.The experimental operation shows that the system has stable performance

convenient operation and low cost

and provides a new solution for bridge accident prediction.