Recently ZC’s LoRa inclinometers have been successfully used on a geotechnical monitoring project in Southeast Asia. It was a major subway line, beside which some hi-rises were to be built. In order to make sure that the soil and underground structures are safe and sound, people needed to check regularly if there were any unexpected changes in tilt angle of the railway sleepers.
On site there were two parallel tunnels. Inside each 40 locations on the railway were to be monitored. Traditionally they should be linked together by cables so each sensor could be provided with electric power and data collected by each sensor could be delivered to a datalogger for temporary storage and further transmission.
This time the customer decided to try the wireless way. 40 LoRa inclinometers and 4 gateways were deployed along the railway in each tunnel. Installed on the wall above the sidewalk, each gateway supported 8 inclinometers close to it. No cables were used for the inclinometers, as they were powered by high capacity Lithium batteries while communication with the gateways was wireless LoRa.
By contrast, the gateways could be powered either by batteries or an external power source. Each gateway was connected to an on-site industrial PC, and the PC would send data to the air via GPRS so engineers were able to analyze data in the office. No dataloggers or RTU’s were needed.
The wireless solution proved to be simple, cost-effective and successful.
ZC’s LoRa inclinometer is a dual axis tilt sensor with +/-15 deg measuring range, 0.001 deg resolution and 0.01 deg accuracy. With the help of a LoRa gateway, it’s able to work continuously for 2-4 years. One gateway is capable of supporting up to 64 sensors, as far as 2.5 kilometers away.
It is believed that LoRa inclinometers, LoRa VW nodes as well as other geological sensors based on LoRa protocol will be increasingly widely used for geo-monitoring.
Post time: 03-12-2018