Abstract
A front end frequency measuring system with a CPLD and an embedded system as the core circuit is designed to achieve the automated connection and measurement of multiple sensors. Then, according to practical project condition, a data transmission scheme with the integration of wireless and wired communications as well as the combination of a private network and a public network is selected. Data transmission from measuring nodes on the top of the shaft to the bottom is completed by wireless data transmission modules, data transmission from measuring nodes at the bottom of the shaft to relay nodes in the main tunnel is completed through a RS485 bus, and data transmission from relay nodes in the main tunnel to the office is completed through the GSM network, thus the remote health status monitoring of civil engineering projects is achieved.
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