The Faculty of Applied Sciences at Ho Chi Minh City University of Technology has developed a groundwater monitoring system that features automatic recording, data storage, and transmission to computers either directly or indirectly via wired telephone networks.
Additionally, the research team has conducted experiments to evaluate the stability, linearity, and environmental influences on the measurement system, as well as monitoring groundwater levels at the Tan Son Nhat station under the Department of Natural Resources and Environment of Ho Chi Minh City.
The water level measurement device operates based on the principle of measuring the water pressure at a fixed point. The relationship between water pressure and depth at the measurement point is linear and depends on the specific gravity of water. The pressure sensor element in the probe is a type of piezoresistive sensor known for its high sensitivity and stability.
The output voltage signal from the sensor is very small, so it is amplified immediately after leaving the sensor. The data storage and transmission device is a LAM Data Logger, which is a single-channel system capable of storing up to 4,050 data points with a sample rate that can be adjusted freely. The device connects to a computer via RS232 communication in two ways: directly through a serial port or indirectly through a modem and wired telephone network.
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