Abstract
when a disruption occurs is essential for the protection of the
machine. Since divertor coils have been installed in JET, during
disruptions a significant difference between the forces measured
on the top and the bottom of the machine has been observed. In
order to investigate these further, optical fiber transducers FBGs
(Fiber Bragg Gratings) were installed in addition to the currently
used strain gauges. During VDE (Vertical Displacement Event)
tests, these new transducers were used to measure different level
of disruptions ranging from 80T up to 230T vertical forces. The
results were then compared with the strain gauges. The FBG
measurement was carried out using a broadband light source
illuminating an array of 4 FBGs through a combination of
directional couplers, connectors and fiber-optic cable. The forces
measured both by FBG and by the strain gauges are within the
same range, except for the initial swing where large random
differences are observed. The tests have demonstrated that the
FBG-based force measurement system has adequate resolution
(±1.52strain corresponding to a force of 4kN due to the geometry
of the leg) and measurement range (50002strain or 13000kN) for
this application.
| Language | English |
|---|---|
| Pages | 4 |
| DOIs | |
| Publication status | Published - Jun 2009 |
| Event | Proceedings - Symposium on Fusion Engineering - Duration: 1 Jan 1900 → … |
Conference
| Conference | Proceedings - Symposium on Fusion Engineering |
|---|---|
| Period | 1/01/00 → … |
Fingerprint
Keywords
- Fiber-optic sensors
- Fusion Energy
- Electrical engineering
- JET
Cite this
}
Measurement of disruption forces in JET using fiber-optic sensors. / Lescure, C.; Fusiek, G.; Hotchin, S.; Ivings, E.; Johnson, M.F.; Niewczas, P.; Riccardo, V.; Walsh, M.; West, A.
2009. 4 Paper presented at Proceedings - Symposium on Fusion Engineering, .Research output: Contribution to conference › Paper
TY - CONF
T1 - Measurement of disruption forces in JET using fiber-optic sensors
AU - Lescure, C.
AU - Fusiek, G.
AU - Hotchin, S.
AU - Ivings, E.
AU - Johnson, M.F.
AU - Niewczas, P.
AU - Riccardo, V.
AU - Walsh, M.
AU - West, A.
PY - 2009/6
Y1 - 2009/6
N2 - Monitoring the forces induced on the vacuum vesselwhen a disruption occurs is essential for the protection of themachine. Since divertor coils have been installed in JET, duringdisruptions a significant difference between the forces measuredon the top and the bottom of the machine has been observed. Inorder to investigate these further, optical fiber transducers FBGs(Fiber Bragg Gratings) were installed in addition to the currentlyused strain gauges. During VDE (Vertical Displacement Event)tests, these new transducers were used to measure different levelof disruptions ranging from 80T up to 230T vertical forces. Theresults were then compared with the strain gauges. The FBGmeasurement was carried out using a broadband light sourceilluminating an array of 4 FBGs through a combination ofdirectional couplers, connectors and fiber-optic cable. The forcesmeasured both by FBG and by the strain gauges are within thesame range, except for the initial swing where large randomdifferences are observed. The tests have demonstrated that theFBG-based force measurement system has adequate resolution(±1.52strain corresponding to a force of 4kN due to the geometryof the leg) and measurement range (50002strain or 13000kN) forthis application.
AB - Monitoring the forces induced on the vacuum vesselwhen a disruption occurs is essential for the protection of themachine. Since divertor coils have been installed in JET, duringdisruptions a significant difference between the forces measuredon the top and the bottom of the machine has been observed. Inorder to investigate these further, optical fiber transducers FBGs(Fiber Bragg Gratings) were installed in addition to the currentlyused strain gauges. During VDE (Vertical Displacement Event)tests, these new transducers were used to measure different levelof disruptions ranging from 80T up to 230T vertical forces. Theresults were then compared with the strain gauges. The FBGmeasurement was carried out using a broadband light sourceilluminating an array of 4 FBGs through a combination ofdirectional couplers, connectors and fiber-optic cable. The forcesmeasured both by FBG and by the strain gauges are within thesame range, except for the initial swing where large randomdifferences are observed. The tests have demonstrated that theFBG-based force measurement system has adequate resolution(±1.52strain corresponding to a force of 4kN due to the geometryof the leg) and measurement range (50002strain or 13000kN) forthis application.
KW - Fiber-optic sensors
KW - Fusion Energy
KW - Electrical engineering
KW - JET
UR - http://dx.doi.org/10.1109/FUSION.2009.5226470
U2 - 10.1109/FUSION.2009.5226470
DO - 10.1109/FUSION.2009.5226470
M3 - Paper
SP - 4
ER -