6
Applications
Open Path Eddy Covariance Systems
ese systems use eddy covariance techniques to cal-
culate water vapor, carbon dioxide, and heat ux.
Below are the sensors used and their measurements:
CSAT3A Sonic Anemometer—absolute wind and •
sonic temperature uctuations
KH20 Hygrometer— uctuations of atmospheric •
water vapor
EC150 Open Path Gas Analyzer—both absolute •
CO
2
and water vapor
FW05 Fine Wire Thermocouple—absolute •
temperature
e CR5000 measures the above sensors and computes
uxes on-line. e raw time-series data can be saved
to a PC-card, along with processed data for later analy-
sis. A PC at the site is not required. e CR5000’s
storage capacity can be increased using PC cards.
Structural and Seismic Monitoring
e CR5000 can be used in applications ranging from
simple beam fatigue analysis, to structural mechanics
research, to continuous monitoring of large, complex
structures. The on-board instruction set supports
many algorithms and math functions that are useful
for structural and seismic monitoring.
The datalogger can store data as rainflow or level
crossing histograms. e rain ow and level crossing
algorithms can be processed for extended periods of
time, not just a nite number of cycles.
e datalogger’s control functions allow it to activate
alarms, actuate electrical devices, or shut down equip-
ment based on time or measured conditions.
Typical sensors used for structural and seismic moni-
toring include:
• Carlson strain meters
• Foil strain gages (set up in quarter, half, or full
bridge strain con gurations)
• Inclinometers
• Crack and joint sensors
• Tilt sensors
• Piezoresistive accelerometers
• Piezoelectric accelerometers
• Capacitive accelerometers
• Borehole accelerometers
• Servo force balance accelerometers
For eddy covariance applications, the CR5000 can measure the
EC150 Open-Path CO
2
Analyzer, CSAT3A Sonic Anemometer, and
KH20 Krypton Hygrometer then compute uxes on-line.
Cracks in the walls of Castillo de San Marcos, Florida were in-
strumented to determine their genesis and the best course for
corrective action.
(6 pagine)
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