Speaker
Antonio Paolozzi
(INFN Frascati + Uni Sapienza Roma)
Description
The use of fiber optic sensors for performing structural health monitoring by
measuring strains is becoming more and more frequent. In fact those
sensors offer several advantages over conventional sensors. One of those is
the immunity from electromagnetic interferences. This aspect is particularly
attractive in the environmental conditions of contemporary High Energy
Physics experiments, where detectors are immersed in magnetic fields. The
Fiber Bragg Grating (FBG) which is one particular fiber optic sensor give an
additional advantage since FBGs can be easily multiplexed within the same
fiber. FBGs are optical strain gauges and the possibility of having more
sensors in the same fiber will significantly reduce the harness required when
strain measurements are needed. In this paper we propose the use of FBGs
for a different purpose with respect to structural health monitor and in
particular to monitor the position of particle detectors at a few micron level.
In fact mechanical and thermal deformations can induce unwanted
displacements on the detector and consequently errors in particle trajectory
reconstruction. Another aspect that will be investigated is the possibility of
using FBG sensors for monitoring accurately the re-positioning of the pixel
detector about the beam pipe. We have proposed and used FBG sensors as
position monitors in HEP experiments at high-intensity colliders such as
FINUDA at Frascati and BTeV at Fermilab (Chicago). In this paper we report
on results on a proposed use of FBG sensors for position monitoring, re-
positioning and alignment of the pixel detector for experiment CMS at LHC
(CERN, Switzerland).
Author
Antonio Paolozzi
(INFN Frascati + Uni Sapienza Roma)
Co-author
Danilo Colonna
(INFN Frascati)
