Design and Evaluation of an Ultrasonic Oxygen Sensor for Medical Ventilators
Typ
Examensarbete för masterexamen
Program
Publicerad
2019
Författare
Isop, Carmen
Torstensson, Andreas
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Many people are affected by respiratory system diseases and need medical ventilators
to help them breathe, often it is also necessary to be able to add extra oxygen
to the breathable air meaning it must be possible to measure the oxygen concentration
in the ventilator. Right now, the most commonly used sensors for this
purpose are electrochemical sensors that are expensive, have slow response-times,
not environment-friendly and cannot measure gas flow. As an alternative solution,
this thesis proposes a design for an ultrasonic oxygen sensor that is capable of measuring
both oxygen concentration and air flow speed, the disadvantage however is
that the ultrasonic sensor is non-selective. The design includes a hardware, software
and mechanical solution and the tests carried out on the developed system showed
that the sensor was multiple times quicker than the reference (electrochemical) sensors.
Furthermore, the accuracy of both concentration and flow measurements were
within 2.5% of the reference sensor and within the design goals.
Beskrivning
Ämne/nyckelord
ultrasonic oxygen sensor , PCB , time-of-flight , flow meter , gas sensors , medical ventilators , engineering , thesis