Smart materials in BTeV?
Antonio Paolozzi
University of Rome ‘La Sapienza’
INFN Laboratori Nazionali Frascati
OBJECTIVE
Testing embedding Fiber Bragg Gratings (FBGs) into a Carbon Fiber Reinforced Plastic Composite (CFRP)
Manufacturing a smart material that could be used in some BTeV applications
POSSIBLE APPLICATIONS
• SUPPORT STRUCTURES OF MICROSTRIP
• SUPPORT OF OTHER DETECTORS
• LOW ATOMIC NUMBER AND HIGH MECHANICAL CHARACTERISTCS
• HIGH THERMAL STABILITY (VERY LOW THERMAL EXPANSION COEFFICIENT
• POSSIBILITY TO POSITION THE SENSORS IN ANY STRUCTURALLY SIGNIFICANT POINT IN THE STRUCTURE
• HIGHER RELIABILITY IN HANDLING SENSORIZED COMPONENTS
WHY CFRP WITH EMBEDDED SENSORS?
DIFFERENT SPECIMENS TO TEST SEVERAL EMBEDDING PROCEDURES
•AVOID FIBER DAMAGE
•OBTAIN OPTIMAL BONDING BETWEEN OPTICAL FIBER
AND COMPOSITE STRUCTURE
Acrylate coated optical fiber Uncoated optical fiber
Micrographic analysis of embedded optical fiber
Micrographic analysis of optical fiber
embedded with epoxy resin film
Acrylate coated optical fiber Uncoated optical fiber
Experimental test
• Structural bonding between CFRP structure and FBG sensor
• FBG resolution (axial deformation) evaluation
3000 2000 1000 0 1000 2000 30000.2
0.1
0
0.1
0.2
Tip Displacement (micron)
Wav
elen
gth
Shi
f (n
m)
0.01 0.005 0 0.005 0.010.2
0.1
0
0.1
0.2
Axial deformation (micron)
Wav
elen
gth
Shi
f (n
m)
Enforced displacement at steps of 100m
Linearity: excellent FBG-CFRP structural bonding
Resolution of axial deformation by FBG: better than 0.5m
100 0 100 200 300 4000.01
0
0.01
0.02
0.03
Tip Displacement (micron)
Wav
elen
gth
Shif
(nm
)
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