Ultrasonic Enuresis Alarm

1
Ultrasonic Enuresis Alarm
Done by Lum Kam Sing Joseph (40444945) Chua
Ywee Liang (40611318) Supervisor Dr Stephen
Wilson
the bladder for about 1 millisecond. The signals
is then sent to the computer for further
analysis.
Introduction
Signal Analysis Result
The feasibility of a "sonar" technique to detect
a bladders volume in an non-invasive manner is
to be investigated. A simple pulse- and-collect,
time of flight experiment is to be constructed
and demonstrated.
Piezo RF Transmitter
Empty Bladder
Full Bladder
Ultrasonic Transducer
The Piezo is driven by a Class E Zero Voltage
Switching Inverter. A square wave of about 1MHz
entered the Power N-Mosfet. The Piezo is then
driven up to 100Vp-p in 1MHz of ultrasonic waves
into the body.
Utrasonic Eneuresis Alarm Design
A bladders volume can be determined from the
amount of time taken between the echoes of the
anterior and posterior walls to work out the
distance between them.
Receiver
The receiving Piezo gathers the echo signals from
the body. Signals are then amplified and filtered
before displayed on the oscilloscope. The signal
can be further processed into the computer or
oscilloscope for analysis.
The transmitter Piezo outputs 1 to 2 seconds of
1MHz wavelength. The Piezo receiver picks up
signals reflected back from
Oscilloscope