The block diagram in Fig. 6 shows how the components
of a tsunameter function together, and an ocean recovery
of a tsunameter is shown in Fig. 7. The computer
reads pressure readings, runs a tsunami detection algorithm,
and sends and receives commands and data to and
from the buoy via an acoustic modem.
The DART II pressure sensor is a 0–10,000 psi model
410K Digiquartz® unit manufactured by Paroscientific,
Inc. The transducers use a very thin quartz crystal beam,
electrically induced to vibrate at its lowest resonant mode.
The oscillator is attached to a Bourdon tube that is open on
one end to the ocean environment [8]. The pressure sensor
outputs two frequency-modulated square waves, proportional
to the ambient pressure and temperature. The temperature
data is used to compensate for the thermal effects
on the pressure-sensing element.