Non-Invasive pressure measurement in PVC tube

Sammanfattning: In peritoneal dialysis it is important to make sure the pressure doesn't exceed certain limits. It is desirable to do the measuring without inserting anything inside of the tubing containing the dialysate. This project uses a load cell pressed against the outside of the PVC tubing to estimate the pressure inside. The interval tested is approximately atmospheric pressure +- 220 mBar. The temperature is constant room temperature (approximately 20 C). The best estimate of the pressure uses a neural network to process the data and results in a mean absolute error of 7.31 mBar. The max error is 126 mBar. The target accuracy was approximately 20 mBar and approximately 88.6 % of the errors are below or equal to 20 mBar. Unfortunately the errors are highly autocorrelated so there is a possibility of something missing from the model.