A Compact Ultrasonic Airflow Sensor for Clinical Monitoring of Pediatric Tracheostomy Patients

dc.contributor.authorRuscher, Thomas Hallen
dc.contributor.committeechairWicks, Alfred L.en
dc.contributor.committeememberMuelenaer, Andre A.en
dc.contributor.committeememberMeehan, Kathleenen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-08-14T06:00:09Zen
dc.date.available2014-08-14T06:00:09Zen
dc.date.issued2013-02-19en
dc.description.abstractInfants and young children with tracheostomies need better respiratory monitors. Mucus in the tracheostomy tube presents a serious choking hazard.  Current devices indirectly detect respiration, often yielding false or delayed alarms.  A compact ultrasonic time-of-flight (TOF) airflow sensor capable of attaching directly to the tracheostomy tube has been developed to address this need.  The ultrasonic flow sensing principle, also known as transit time ultrasound, is a robust method that correlates the timing of acoustic signals to velocity measurement.  The compact prototype developed here can non-invasively measure all airflow into and out of a patient, so that breath interruption can easily be detected. This paper concerns technical design of the sensor, including the transducers, analog/digital electronics, and embedded systems hardware/software integration.   Inside the sensor's flow chamber, two piezoelectric transducers sequentially transmit and receive ping-like acoustic pulses propagating upstream and downstream of flow.  A microcontroller orchestrates measurement cycles, which consist of the transmission, reception, and signal processing of each acoustic pulse.  The velocity and direction of airflow influence transit time of the acoustic signals.  Combining TOF measurements with the known geometry of the flow chamber, average air velocity and volumetric flow rate can be calculated.  These principles have all been demonstrated successfully by the prototype sensor developed in this research.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:206en
dc.identifier.urihttp://hdl.handle.net/10919/50143en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectUltrasonicen
dc.subjectTime-of-flighten
dc.subjectAirflowen
dc.subjectSensoren
dc.subjectTracheostomyen
dc.titleA Compact Ultrasonic Airflow Sensor for Clinical Monitoring of Pediatric Tracheostomy Patientsen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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