Testing of pressure piezoelectric sensors

For Momo Medical

Bachelor thesis (2018)

Authors

B.K.D. Koele Electrical Engineering, Mathematics and Computer Science
T.H.T. Leferink Electrical Engineering, Mathematics and Computer Science
T.L.P. Nguyen Electrical Engineering, Mathematics and Computer Science

Contributors

J. Bastemeijer (supervisor 1)
I.E. Lager (supervisor 2)
J. Hoekstra (supervisor 2)
Menno Gravemaker (supervisor 2)
Faculty
Electrical Engineering, Mathematics and Computer Science
Copyright: © 2018 Berend Koele, Tim Leferink, Phu Nguyen
Sensor Pressure Piezoelectric Momo Medical Ulcers Pneumatics
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Published Date

21-12-2018

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

In this thesis, a test device is designed for the company Momo Medical. Momo Medical is developing a system that can be used to prevent pressure ulcers and adding more functionality is being investigated. For this system they need a device to test the functionality of the six piezoelectric sensors that are used in their product. The sensors’ response to a known pulse needs to be tested in order to give a pass/fail indication of the sensor quality. First, different ways of testing the sensors are investigated. Based on the results of the investigation, a final test setup is chosen and characterized. The test system developed in this thesis is based on a pneumatic setup, using a solenoid valve to control well-defined air pulses directed towards the sensors. Due to the addition of a reference load cell with custom designed read-out electronics, the device is able to test all six sensors one at the time and provides detailed feedback about the individual sensor quality. The test is performed using GUI-based software written in MATLAB, connected to a microcontroller. The software offers a broad variety of settings and can be configured according to Momo Medical’s wishes. After configuration, the test can be performed at the click of a button. The standard deviation of the device precision over three hours is sigma = 4.16, which equals a variation of cv = 0.82% of the mean μ = 504.8. This easily satisfies the requirements set byMomoMedical.