Why Pressure Sensors Can Measure Liquid Level and Altitude
A pressure sensor seems to output only one thing: pressure. In engineering, that pressure is often used to infer liquid level, altitude, filter blockage, airflow, or tank state.
The first model is: a pressure sensor measures force per unit area. Liquid level, altitude, and flow-related states are model-based interpretations of that pressure.
External pressure acts on diaphragm
-> Diaphragm deforms
-> Piezoresistive or capacitive structure changes
-> Analog front end and ADC
-> Pressure output
-> Application model interprets level, altitude, or differential pressure
What Pressure Is
Pressure is force distributed over area:
Read More