Applications
Structural and Seismic Monitoring
The rapid sampling rate and large number of high resolution chan-
nels provided by the CR9000X-series dataloggers make them ideal
for structural and seismic monitoring. These dataloggers can be
used in applications ranging from simple beam fatigue analysis, to
structural mechanics research,
to continuous monitoring of
large, complex structures.
The onboard instruction set
supports many algorithms
and math functions that are
useful for structural and seismic
monitoring. The datalogger
can store data as rainow or
level crossing histograms. The
rainow and level crossing
algorithms can be processed
for extended periods of time,
not just a nite number of
cycles. The instruction set also
supports triggered output with
pre-trigger data capture capa-
bility. Triggers can be based
on sensor output, time, and/
or user control.
For example, if an overpass or bridge is being monitored, data collec-
tion can be triggered:
(1) by a sensor detecting the approach of a car or an earthquake,
(2) at pre-programmed times, or
(3) by pushing a button.
The datalogger’s control functions allow it to activate alarms, actuate
electrical devices, or shut down equipment based on time or mea-
sured conditions.
Typical sensors used for structural and seismic monitoring include:
Carlson strain meters
Foil strain gages (set up in quarter, half, or full bridge strain
congurations)
Inclinometers
Crack and joint sensors
Tilt sensors:
Piezoresistive accelerometers
Piezoelectric accelerometers
Capacitive accelerometers
Borehole accelerometers
Servo force balance accelerometers
Our dataloggers have been used over the years to monitor many prominent bridges. Whether bridges are large or small, Campbell
Scientic is committed to providing quality instrumentation and support to help maintain their safety.
The CR9000X supports remote,
unattended monitoring of highway
overpasses, amusement park rides,
roads, buildings, and retaining walls.
Photography by Boily
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