Non-Invasive Liquid Metering Method Analysis

Sammanfattning: The ability to measure flow in pipes often introduces expensive and difficult installations due to existing flow-meters being invasive. To solve this a non-invasive solution has been found by testing and evaluating different mechanical and electrical methods using ultrasonic piezo-crystals and time-of-flight calculations. The solution consists of an impedance matched circuit with a boosting circuit. Using ultrasound in an non-invasive way comes with a decreased accuracy which can be increased using various software methods. The results from tests at different water-flows shows that there is no significant statistical difference between the developed flow-meter and an existing mechanical one. It also shows that calibration has a major impact on the measured values. This hints at that with the right calibration of the ultrasonic flow-meter it should be possible to close the performance gap between the two flow-meters.