TY - GEN
T1 - Interferometric readout for a monolithic accelerometer, towards the fm/√Hz
AU - Van Heijningen, J.V.
AU - Bertolini, A.
AU - Rabeling, D.
AU - Van Den Brand, J.F.J.
PY - 2014
Y1 - 2014
N2 - The Virgo Gravitational Wave Observatory (Cascina, Italy) has encountered problems with scattered light from vibrating, out-of-vacuum, sensing optics coupling back into the interferometer resulting in lower sensitivies. The upcoming upgrade for this detector necessitates for scattered light mitigation. An optical bench houses the optics and this bench has to be seismically isolated as well, in a similar way as the mirrors of the interferometer have to be decoupled from the Earth's movement. Nikhef has designed and built the compact isolator to do this, called MultiSAS, but to measure its residual motion in full assembly and its isolation performance, no (commercial) sensor is available that is good enough to actually measure it. A novel vibration sensor is built at Nikhef by using an interferometric readout for a horizontal monolithic accelerometer, which should be able to measure in the vicinity of the fm/√Hz regime. This accelerometer is compact for its performance and vacuum compatible. Current results show lowest noise levels around 70 fm/√Hz, 1.5 orders of magnitude too high, for which two possible reasons are suspected.
AB - The Virgo Gravitational Wave Observatory (Cascina, Italy) has encountered problems with scattered light from vibrating, out-of-vacuum, sensing optics coupling back into the interferometer resulting in lower sensitivies. The upcoming upgrade for this detector necessitates for scattered light mitigation. An optical bench houses the optics and this bench has to be seismically isolated as well, in a similar way as the mirrors of the interferometer have to be decoupled from the Earth's movement. Nikhef has designed and built the compact isolator to do this, called MultiSAS, but to measure its residual motion in full assembly and its isolation performance, no (commercial) sensor is available that is good enough to actually measure it. A novel vibration sensor is built at Nikhef by using an interferometric readout for a horizontal monolithic accelerometer, which should be able to measure in the vicinity of the fm/√Hz regime. This accelerometer is compact for its performance and vacuum compatible. Current results show lowest noise levels around 70 fm/√Hz, 1.5 orders of magnitude too high, for which two possible reasons are suspected.
UR - http://www.scopus.com/inward/record.url?scp=85011552294&partnerID=8YFLogxK
M3 - Conference contribution
T3 - Proceedings of Science
BT - Technology and Instrumentation in Particle Physics 2014, TIPP 2014
PB - Proceedings of Science (PoS)
T2 - 3rd Technology and Instrumentation in Particle Physics Conference, TIPP 2014
Y2 - 2 June 2014 through 6 June 2014
ER -